Where is the snack training center
Publish: 2021-05-29 03:44:42
1.
The principle of running deviation is: "running tight but not loose", "running high but not low", "running after but not before". In other words, if the looseness on both sides of the belt is different, the belt will move to the tight side; If the height of both sides of the belt is different, the belt will move to the high side
If a device, such as the idler bracket, is not installed on the vertical part of the belt, but one end is in the front and the other end is in the back (along the direction of the belt), the belt will move backward
The root cause of belt deviation is that the resultant force in the direction of belt width is not zero or the tension in the vertical direction of belt width is not uniformcauses of these phenomena and improvement measures
1. The center line of belt conveyor is not installed in a straight line. It should be adjusted so that the head and tail of the belt are in a straight line
The belt itself is bent or the joint between belts is not straight. The belt buckle is bent or the belt cutting mark is not at right angles to the belt width, so the belt tension is not uniform. When the machine is running, when the belt runs there, there will be a running deviation. In this case, the belt can be cut off, straightened, glued back or hit the buckle 
preventive measures for belt deviation:
(1) strengthen quality inspection and maintenance. Choose the belt from the manufacturer with regular and guaranteed quality, carefully check the belt conveyor before installation, conct quality inspection on the belt surface, roller, idler, cleaning and tensioning device, and resolutely replace the unqualified ones, so as to ensure the installation quality from the source. The drum with large error in external surface processing must be returned to the factory for treatment
in the long-term use, if the drum with uneven wear on both sides is found, the surface of the drum should be cleaned of sticky coal, replaced, and then re processed with rubber coating until the diameter is the same. The belt which is seriously aged and deformed and cannot be used normally shall be replaced. The vulcanization joint of the belt must be kept flat, the center lines of the two butted belts must coincide, and the vulcanization joint must be perpendicular to the center line of the belt
(2) strengthen equipment management and operator training. The coal preparation plant should strengthen the management of the equipment, establish a perfect mechanical and electrical equipment management system, strengthen the training of operators, carry out daily maintenance and regular overhaul of the belt conveyor, and ensure that the electrical protection of the belt conveyor, such as anti deviation, longitudinal tearing, smoke, under speed, anti blocking, pull wire opening and closing, should be effective and reliable2. In 2009, Hebei junior high school graation culture course examination
science comprehensive examination paper (Physics Part)
this paper is divided into two parts: paper I and paper II; Volume I is multiple choice and Volume II is non multiple choice
the full score of this paper is 120, and the examination time is 120 minutes
Volume I (multiple choice questions)
I. multiple choice questions (there are 22 sub questions in this major question: 2 points for each sub question, 44 points in total. Only one of the four options given in each sub question is consistent with the meaning of the question)
8. The only physical changes in the following process are ()
A. remove the scale in the kettle with vinegar; B. heat the egg white to solidify; C. remove the vegetable leaves in the water with filter screen; D. the bread is moldy; B
9 In Figure 4, it can be shown that the molecular spacing becomes smaller ()
[answer] d
10. Aluminum foil is often used in food packaging. The reason why aluminum can be made into aluminum foil is that aluminum has ()
A. good thermal conctivity B. good ctility C. strong corrosion resistance D. low density
[answer] B
11. Rubber asphalt used in highway construction is made of rubber powder made from waste tires, and then mixed with asphalt by adding different chemicals. The following statement is not correct ()
A. both rubber and asphalt are organic synthetic materials; B. rubber asphalt makes full use of "waste"; C. rubber asphalt pavement has good elasticity and can increase friction; D. rubber asphalt pavement has large voids, It can rece the traffic noise
[answer] a
[analysis] as a new situation, this paper examines the students' grasp of the essence of the phenomenon. For example, it is mentioned in the title that "rubber asphalt is used to make rubber powder from waste tires", so the measure is "waste utilization", B is correct; It is not difficult to think that C and D are also correct from their properties. The so-called "synthetic material" refers to artificial synthesis. Asphalt is not a synthetic material, but a part of petroleum procts, so it is natural. So the answer is a
12. The incorrect explanation of the phenomenon shown in Figure 5 is ()
A. figure a: because the hardness of brass is greater than that of pure copper, deep scratches are left on the copper sheet
B. figure B: because the molecules keep moving, the speed of ink diffusion in water with different temperatures is different
C. figure C: e to the three conditions of combustion, the ink diffusion speed is different, Therefore, white phosphorus can burn under water
D. Ding figure: because the fluid pressure is related to the flow rate, people should stand outside the safety line again
[answer] B
[analysis] this is a fallible question. Note that the speed of ink diffusion in water with different temperatures in option B is correct, but the explanation is wrong, It's because the irregular motion of molecules is affected by temperature, not "because the molecules keep moving."
13. There are two bottles of colorless liquid without label, one is saturated sodium chloride solution and the other is distilled water. In order to distinguish them, the students put forward the following methods: ① evaporation; ② density measurement; ③ conctivity measurement; ④ pH measurement; ⑤ adding sodium chloride; ⑥ adding vinegar. What you think is feasible is ()
a. ①, ②, ③, ⑤ B. ①, ③, ④, ⑤ C. ②, ③, ④, ⑥ D. ②, ③, ⑤, ⑥
[answer] a
[analysis] the identification of substances can be distinguished by physical method or chemical method, so it is a hot spot of comprehensive examination. It should be noted that distilled water is an insulator and the aqueous solution of acid-base salt is a conctor, so method 3 is feasible; Both of them are neutral, so they can not be distinguished
14. The correct way is as follows ()
A. ignite sulfur in oxygen, and determine that the proct is sulfur dioxide according to the blue purple flame
B. put different substances of equal mass into water under the same conditions, and compare their solubility through the dissolution rate
C. put two identical candles on both sides of the thin glass plate, This paper studies the imaging characteristics of plane mirror by equivalent method
D. making the same car slide down from the same height, according to the length of the car's moving distance on different horizontal surfaces, Newton's first law can be directly obtained
[answer] C
[analysis] this problem is a comprehensive problem of knowledge points, and the two physical options of CD focus on the examination method, In particular, we should pay attention to the fact that Newton's first law is not an experimental law, and it can not be verified by experiments, nor can it be directly obtained by experiments, but can be inferred on the basis of experiments< The correct statement about sound and electromagnetic wave is ()
A. both sound and electromagnetic wave can transmit information and can spread in vacuum
B. installing double glass windows in residential buildings can rece the impact of noise on indoor environment
C. "Stethoscope" can increase the amplitude and loudness of human heart vibration
D. the "voiceprint lock" can only be opened when the owner speaks a secret language, The main sentence to distinguish sound is tone
[answer] B
[analysis] the test site of sound and electromagnetic wave is a fixed test site in Hebei high school entrance examination, which is not difficult, but involves a lot of knowledge. In this problem, we need to pay attention to the C option "Stethoscope" is to use solid sound transmission effect is good, so that the listener can hear more loudness than without stethoscope
16. The incorrect statement about home circuit is ()
a. the use of three hole socket in washing machine can prevent people from getting electric shock
B. the switch of electric light can be installed on the re fire line or the zero line
C. The use of electric pen can distinguish the fire line and the zero line in home circuit
D. the fuse is blown, The power of automatic washing machine is about 20W. The voltage between two poles of dry battery is about 2V. The average temperature of Hebei Province is about 32oc. D. the width of table tennis table is about 1.5m />18. Fig. 6 is a schematic diagram of object a imaging through a convex lens (the lens is not marked). When the convex lens is placed at which point, the image a '()
A.A point B.B point C.C point D.D point can be proced.
[answer] C
[analysis] this paper studies the imaging law of convex lens, and it can be seen from the figure that it is inverted and reced real image, so the image distance is less than the object distance, so it should be placed at point C
19. According to the specific heat capacities of several substances in the table, it is judged that the following statements are incorrect ()
A. mercury is commonly used as the medium for thermometer making, one of the reasons is that the specific heat capacity of mercury is small
B. heating water in northern buildings uses the characteristic of large specific heat capacity of water
C. because the specific heat capacity of water is larger than that of sand and stone, Therefore, the temperature difference between day and night in inland areas is larger than that in coastal areas
D. because the specific heat capacity of water is larger than that of ice, the cooling effect of 0oC water is better than that of 0oC ice when cooling food
[answer] d
[analysis] the cooling effect of 0oC ice is better than that of 0oC water when cooling food, because the endothermic temperature of crystal melts unchanged
20. The following description or explanation of motion and force is correct ()
A. when hitting volleyball, the hand feels pain because of the interaction of forces
B. when drinking drinks with habit, the "suction" of the mouth makes the drink rise to the mouth
C. when parachutists fall at a constant speed, people are moving with the umbrella as the reference
D. people push objects on the horizontal ground along the horizontal direction, There is no push, because the thrust is less than the friction force
[answer] a
[analysis] this is a fallible question, because it is disturbed by the preconceived idea in daily life, that is, the thrust force is less than the friction force, the pushing object is not moving, and the object is in a state of balance, so the friction force is equal to the external thrust force
21. An object (cuboid) floats on the liquid surface, as shown in Fig. 7 (a). The force is applied to the object to make it descend to the dotted line in the figure. It is known that the height from the lower surface of the object to the water surface is h, the pressure of water on the lower surface of the object is p, and the buoyancy of the object is f floating. The relationship between P, f floating and H is shown in Fig. 7 (b). Among them, the correct ones are ()
a. ① ③ B. ① ④ C. ② D. ② ④
[answer] a
[analysis] in the senior high school entrance examination, students pay attention to the application ability of mathematics. One of them is reflected in the image processing. From the characteristics of the internal pressure of the liquid, it can not be concluded that ① is correct; Note that the buoyancy of an object immersed in liquid has nothing to do with its immersion depth
22. As shown in Figure 8, the power supply voltage does not change. Close the switch s, and when the slide
P is placed at the middle point of the varistor, the indication of the voltmeter is 4V; When the slide
P is placed at the B end of the varistor, the indication of the voltmeter changes by 2V, and the heat generated by the constant resistance R1 is 60j within 15s. The following results are correct: a. the power supply voltage is 10V; B. the resistance of R1 is 18 Ω
C. The maximum resistance of sliding rheostat R is 9 Ω
D. the ratio of electric power consumed by R1 is 4:3.
[answer] C
[analysis] this is a calculation type multiple-choice question, which can be solved directly or eliminated one by one by using "substitution method"
solution: when the slide P is placed at the B end of the rheostat, the voltage indication should be increased by 2V, that is, 6V at this time. If the maximum resistance of the slide rheostat is set as R, it can be obtained that
because the power supply voltage remains unchanged, the heat generated by the constant resistance R1 within 15s is 60j, that is,
solution: the maximum resistance of the slide rheostat is r = 9 Ω Constant resistance R1 = 9 Ω The power supply voltage is 12V; The ratio of R1 current to R1 current is 4:3, so the ratio of power consumed is 16:9<
2009 Hebei junior high school entrance examination
science comprehensive examination paper (Physics Part)
Volume II (non choice questions)
2. Fill in the blanks and short answer questions (4 points for the 23rd question, 3 points for the 24th question, 1 point for each blank for the rest questions)
23. Answer the following questions according to the information provided in Figure 9
(1) question: why does the plug continue to move forward after it runs out of the tube
answer:
(2) question: how does the energy transform when the plug is pushed out
answer:
(3) ask a question about the change of state of matter and answer it
question:
answer:< (1) the plug has inertia 2) Internal energy is transformed into kinetic energy
(3) how does the "white gas" form after the plug goes out of the test tube? This is an open-ended problem of pictures. The pictures are from the textbook, and the students' mastery of the basic knowledge of the textbook is tested. Remind the examination review must return to the textbook
24. Sometimes, the reflection of classroom blackboard can "shake" some students' eyes, the reason is
; In order to protect students' eyes, please put forward a suggestion to change this situation according to the knowledge you have learned
in Figure 10, Ao is a ray of 60o with the plane mirror. Please draw the reflected ray in the figure and mark the degree of reflection angle
[answer] specular reflection occurs; Use non reflective materials to make blackboard, etc
[analysis] the problem is easy to lose points in the drawing, we must strictly follow the requirements of the topic, remember to mark the degree of reflection angle. The angle between the mirror and the light is not the incidence angle
25. As shown in Figure 11, close the switch and power on the upper part of the solenoid
science comprehensive examination paper (Physics Part)
this paper is divided into two parts: paper I and paper II; Volume I is multiple choice and Volume II is non multiple choice
the full score of this paper is 120, and the examination time is 120 minutes
Volume I (multiple choice questions)
I. multiple choice questions (there are 22 sub questions in this major question: 2 points for each sub question, 44 points in total. Only one of the four options given in each sub question is consistent with the meaning of the question)
8. The only physical changes in the following process are ()
A. remove the scale in the kettle with vinegar; B. heat the egg white to solidify; C. remove the vegetable leaves in the water with filter screen; D. the bread is moldy; B
9 In Figure 4, it can be shown that the molecular spacing becomes smaller ()
[answer] d
10. Aluminum foil is often used in food packaging. The reason why aluminum can be made into aluminum foil is that aluminum has ()
A. good thermal conctivity B. good ctility C. strong corrosion resistance D. low density
[answer] B
11. Rubber asphalt used in highway construction is made of rubber powder made from waste tires, and then mixed with asphalt by adding different chemicals. The following statement is not correct ()
A. both rubber and asphalt are organic synthetic materials; B. rubber asphalt makes full use of "waste"; C. rubber asphalt pavement has good elasticity and can increase friction; D. rubber asphalt pavement has large voids, It can rece the traffic noise
[answer] a
[analysis] as a new situation, this paper examines the students' grasp of the essence of the phenomenon. For example, it is mentioned in the title that "rubber asphalt is used to make rubber powder from waste tires", so the measure is "waste utilization", B is correct; It is not difficult to think that C and D are also correct from their properties. The so-called "synthetic material" refers to artificial synthesis. Asphalt is not a synthetic material, but a part of petroleum procts, so it is natural. So the answer is a
12. The incorrect explanation of the phenomenon shown in Figure 5 is ()
A. figure a: because the hardness of brass is greater than that of pure copper, deep scratches are left on the copper sheet
B. figure B: because the molecules keep moving, the speed of ink diffusion in water with different temperatures is different
C. figure C: e to the three conditions of combustion, the ink diffusion speed is different, Therefore, white phosphorus can burn under water
D. Ding figure: because the fluid pressure is related to the flow rate, people should stand outside the safety line again
[answer] B
[analysis] this is a fallible question. Note that the speed of ink diffusion in water with different temperatures in option B is correct, but the explanation is wrong, It's because the irregular motion of molecules is affected by temperature, not "because the molecules keep moving."
13. There are two bottles of colorless liquid without label, one is saturated sodium chloride solution and the other is distilled water. In order to distinguish them, the students put forward the following methods: ① evaporation; ② density measurement; ③ conctivity measurement; ④ pH measurement; ⑤ adding sodium chloride; ⑥ adding vinegar. What you think is feasible is ()
a. ①, ②, ③, ⑤ B. ①, ③, ④, ⑤ C. ②, ③, ④, ⑥ D. ②, ③, ⑤, ⑥
[answer] a
[analysis] the identification of substances can be distinguished by physical method or chemical method, so it is a hot spot of comprehensive examination. It should be noted that distilled water is an insulator and the aqueous solution of acid-base salt is a conctor, so method 3 is feasible; Both of them are neutral, so they can not be distinguished
14. The correct way is as follows ()
A. ignite sulfur in oxygen, and determine that the proct is sulfur dioxide according to the blue purple flame
B. put different substances of equal mass into water under the same conditions, and compare their solubility through the dissolution rate
C. put two identical candles on both sides of the thin glass plate, This paper studies the imaging characteristics of plane mirror by equivalent method
D. making the same car slide down from the same height, according to the length of the car's moving distance on different horizontal surfaces, Newton's first law can be directly obtained
[answer] C
[analysis] this problem is a comprehensive problem of knowledge points, and the two physical options of CD focus on the examination method, In particular, we should pay attention to the fact that Newton's first law is not an experimental law, and it can not be verified by experiments, nor can it be directly obtained by experiments, but can be inferred on the basis of experiments< The correct statement about sound and electromagnetic wave is ()
A. both sound and electromagnetic wave can transmit information and can spread in vacuum
B. installing double glass windows in residential buildings can rece the impact of noise on indoor environment
C. "Stethoscope" can increase the amplitude and loudness of human heart vibration
D. the "voiceprint lock" can only be opened when the owner speaks a secret language, The main sentence to distinguish sound is tone
[answer] B
[analysis] the test site of sound and electromagnetic wave is a fixed test site in Hebei high school entrance examination, which is not difficult, but involves a lot of knowledge. In this problem, we need to pay attention to the C option "Stethoscope" is to use solid sound transmission effect is good, so that the listener can hear more loudness than without stethoscope
16. The incorrect statement about home circuit is ()
a. the use of three hole socket in washing machine can prevent people from getting electric shock
B. the switch of electric light can be installed on the re fire line or the zero line
C. The use of electric pen can distinguish the fire line and the zero line in home circuit
D. the fuse is blown, The power of automatic washing machine is about 20W. The voltage between two poles of dry battery is about 2V. The average temperature of Hebei Province is about 32oc. D. the width of table tennis table is about 1.5m />18. Fig. 6 is a schematic diagram of object a imaging through a convex lens (the lens is not marked). When the convex lens is placed at which point, the image a '()
A.A point B.B point C.C point D.D point can be proced.
[answer] C
[analysis] this paper studies the imaging law of convex lens, and it can be seen from the figure that it is inverted and reced real image, so the image distance is less than the object distance, so it should be placed at point C
19. According to the specific heat capacities of several substances in the table, it is judged that the following statements are incorrect ()
A. mercury is commonly used as the medium for thermometer making, one of the reasons is that the specific heat capacity of mercury is small
B. heating water in northern buildings uses the characteristic of large specific heat capacity of water
C. because the specific heat capacity of water is larger than that of sand and stone, Therefore, the temperature difference between day and night in inland areas is larger than that in coastal areas
D. because the specific heat capacity of water is larger than that of ice, the cooling effect of 0oC water is better than that of 0oC ice when cooling food
[answer] d
[analysis] the cooling effect of 0oC ice is better than that of 0oC water when cooling food, because the endothermic temperature of crystal melts unchanged
20. The following description or explanation of motion and force is correct ()
A. when hitting volleyball, the hand feels pain because of the interaction of forces
B. when drinking drinks with habit, the "suction" of the mouth makes the drink rise to the mouth
C. when parachutists fall at a constant speed, people are moving with the umbrella as the reference
D. people push objects on the horizontal ground along the horizontal direction, There is no push, because the thrust is less than the friction force
[answer] a
[analysis] this is a fallible question, because it is disturbed by the preconceived idea in daily life, that is, the thrust force is less than the friction force, the pushing object is not moving, and the object is in a state of balance, so the friction force is equal to the external thrust force
21. An object (cuboid) floats on the liquid surface, as shown in Fig. 7 (a). The force is applied to the object to make it descend to the dotted line in the figure. It is known that the height from the lower surface of the object to the water surface is h, the pressure of water on the lower surface of the object is p, and the buoyancy of the object is f floating. The relationship between P, f floating and H is shown in Fig. 7 (b). Among them, the correct ones are ()
a. ① ③ B. ① ④ C. ② D. ② ④
[answer] a
[analysis] in the senior high school entrance examination, students pay attention to the application ability of mathematics. One of them is reflected in the image processing. From the characteristics of the internal pressure of the liquid, it can not be concluded that ① is correct; Note that the buoyancy of an object immersed in liquid has nothing to do with its immersion depth
22. As shown in Figure 8, the power supply voltage does not change. Close the switch s, and when the slide
P is placed at the middle point of the varistor, the indication of the voltmeter is 4V; When the slide
P is placed at the B end of the varistor, the indication of the voltmeter changes by 2V, and the heat generated by the constant resistance R1 is 60j within 15s. The following results are correct: a. the power supply voltage is 10V; B. the resistance of R1 is 18 Ω
C. The maximum resistance of sliding rheostat R is 9 Ω
D. the ratio of electric power consumed by R1 is 4:3.
[answer] C
[analysis] this is a calculation type multiple-choice question, which can be solved directly or eliminated one by one by using "substitution method"
solution: when the slide P is placed at the B end of the rheostat, the voltage indication should be increased by 2V, that is, 6V at this time. If the maximum resistance of the slide rheostat is set as R, it can be obtained that
because the power supply voltage remains unchanged, the heat generated by the constant resistance R1 within 15s is 60j, that is,
solution: the maximum resistance of the slide rheostat is r = 9 Ω Constant resistance R1 = 9 Ω The power supply voltage is 12V; The ratio of R1 current to R1 current is 4:3, so the ratio of power consumed is 16:9<
2009 Hebei junior high school entrance examination
science comprehensive examination paper (Physics Part)
Volume II (non choice questions)
2. Fill in the blanks and short answer questions (4 points for the 23rd question, 3 points for the 24th question, 1 point for each blank for the rest questions)
23. Answer the following questions according to the information provided in Figure 9
(1) question: why does the plug continue to move forward after it runs out of the tube
answer:
(2) question: how does the energy transform when the plug is pushed out
answer:
(3) ask a question about the change of state of matter and answer it
question:
answer:< (1) the plug has inertia 2) Internal energy is transformed into kinetic energy
(3) how does the "white gas" form after the plug goes out of the test tube? This is an open-ended problem of pictures. The pictures are from the textbook, and the students' mastery of the basic knowledge of the textbook is tested. Remind the examination review must return to the textbook
24. Sometimes, the reflection of classroom blackboard can "shake" some students' eyes, the reason is
; In order to protect students' eyes, please put forward a suggestion to change this situation according to the knowledge you have learned
in Figure 10, Ao is a ray of 60o with the plane mirror. Please draw the reflected ray in the figure and mark the degree of reflection angle
[answer] specular reflection occurs; Use non reflective materials to make blackboard, etc
[analysis] the problem is easy to lose points in the drawing, we must strictly follow the requirements of the topic, remember to mark the degree of reflection angle. The angle between the mirror and the light is not the incidence angle
25. As shown in Figure 11, close the switch and power on the upper part of the solenoid
3. There is one in the school of physics and chemistry. Search it by yourself. I posted the address just now, but the system refused. Do not know why?
4. Ministry of instry and information technology: the overall situation of instrial economy in the first quarter of 2010
since the beginning of this year, the effects of various policies and measures to deal with the international financial crisis have continued to show, and instrial proction has continued the operation trend since the second half of last year and continued to maintain rapid growth. In the case of a low base in the same period of last year, the economic efficiency has improved significantly, the export has improved, and the employment situation has improved. However, the rebound is good, and the foundation still needs to be further consolidated< In the first quarter, the instrial added value was 3526.3 billion yuan, up 14.5% year on year; Among them, the added value of instries above designated size increased by 19.6%, 1.6 percentage points faster than that in the fourth quarter of last year, and 14.5 percentage points faster than that in the same period of last year
the growth of heavy instry was accelerated, and the operation of light instry was stable. In the first quarter, the added value of light and heavy instries (above scale, the same below) increased by 14.1% and 22.1% respectively year-on-year, and the growth rates accelerated by 7.3 and 17.6 percentage points respectively year-on-year; In March, they increased by 13.4% and 20% respectively
the central and western regions grew rapidly. In the first quarter, the added value of instries above Designated Size in the eastern, central and western regions increased by 18.3%, 23.1% and 20.2% year-on-year respectively, including 16.9%, 22.2% and 17.2% in March. In terms of provinces and cities, the growth rate of instries above Designated Size in 23 provinces exceeded 20% in the first quarter, among which Shanxi, Ningxia, Tianjin, Sichuan and Hubei increased by 39.8%, 37.2%, 30.5%, 30.4% and 30.3% respectively; Shandong, Jiangsu, Guangdong, Henan and Liaoning, the major instrial provinces, grew by 21.9%, 21.2%, 16.5%, 27.9% and 22.1% respectively
the export of instrial procts recovered. In the first quarter, the value of export delivery of instries above designated size increased by 25.2% year-on-year (down 16% in the same period of last year) from the low base of last year, and increased by 4.6% over the same period of 2008; The growth rate in March was 25.7%, 3.3 percentage points higher than that in the previous two months. According to customs statistics, China's foreign trade exports in the first quarter amounted to US $316.2 billion, up 28.7% year on year (down 19.7% in the same period of last year), with an increase of 24.3% in March
the growth rate of instrial investment dropped. In the first quarter, the instrial investment was 1225.1 billion yuan, a year-on-year increase of 22.7% (23.9% in March), and the growth rate dropped by 3.5 percentage points; Among them, the investment in manufacturing instry was 956.5 billion yuan, an increase of 25.8%
the ex factory prices of instrial procts and the purchase prices of raw materials, fuel and power rose rapidly, and the pressure of cost driving increased. Since December last year, the ex factory prices of instrial procts and the purchase prices of raw materials, fuels and power have changed from negative to positive and continued to rise. In the first quarter, the ex factory prices of instrial procts increased by 5.2% year-on-year (down 4.6% in the same period of last year), 5.9% in March and 0.5% month on month. Among them, the means of proction and means of living increased by 6.5% and 0.9% respectively. The purchase price of raw materials, fuel and power increased by 9.9% on a year-on-year basis (11.5% on a year-on-year basis and 0.5% on a month on month basis), among which the price of fuel and power increased by 23.5%
the connection between proction and marketing is good. The sales rate of instrial procts nationwide was 97.5%, up 0.5 percentage points year on year. Among them, the proction and marketing rates of light and heavy instries were 97.2% and 97.6% respectively
the operation of instrial enterprises has improved significantly. From January to February, instrial enterprises above Designated Size achieved a profit of 486.7 billion yuan, of which small and medium-sized enterprises achieved a profit of 298.1 billion yuan, up 119.7% and 90.3% year on year respectively; The tax paid was 427.8 billion yuan, an increase of 32.8%; 8% year on year; The loss area was 19.6%, 5.7 percentage points lower than the same period last year
the employment situation of enterprises has improved significantly. The average number of employees in Instrial Enterprises above designated size was 82.32 million, an increase of 3.99 million or 5.1% over the same period of last year (only 0.4% over the same period of last year); Among them, the number of employees of small and medium-sized enterprises was 63.74 million, an increase of 3.43 million or 5.7%< In the first quarter of 2010, the added value of raw material instry increased by 19.3% year-on-year, accelerating by 14.3 percentage points year-on-year; The growth rate in March was 17.4%<
Metallurgy: in the first quarter, the added value of metallurgical instry increased by 20.7%, with a year-on-year increase of 18.7 percentage points; The growth rate in March was 19.4%. The crude steel output was 158.01 million tons, up 24.5% year on year, and the average daily output was 12.8% higher than that of last year; The average daily output in March was 1.773 million tons, 1.7% higher than that in January February. Steel output was 185.75 million tons, up 28.6% year on year. From January to February, the metallurgical instry realized a profit of 29.8 billion yuan, a year-on-year increase of 5.96 times (a year-on-year decrease of 90.1%); The loss of loss making enterprises was 5.57 billion yuan, with a year-on-year decrease of 11.1 billion yuan
the import and export volume of iron and steel increased greatly. In the first quarter, 4.11 million tons of steel were imported, up 27.3% year on year; 8.71 million tons of steel procts were exported, an increase of 69.5%; The import and export of steel billets was equivalent to 4.74 million tons of crude steel net export, an increase of 4.2 times. The import of iron ore kept growing, and the price of ore powder reached new highs. In the first quarter, the import of iron ore was 155.03 million tons, an increase of 18%; Among them, 59.01 million tons of imports were imported in March (9.63 million tons more than last month), an increase of 13.5%. At the end of March, the price of 63.5% Indian iron concentrate powder in Qing port reached 1180 yuan / ton, 220 yuan / ton higher than the highest price last year
steel prices are rising rapidly. In March, the domestic steel market prices rose rapidly in the two months before the end of the stable trend. On March 29, the comprehensive steel price index was 116.81, 7.7 points higher than that at the end of last month, reaching the highest point since the middle of October 2008. According to the statistics of the iron and Steel Instry Association, the price per ton of 6.5mm ordinary line, 16mm rebar and 10mm plate were 4140 yuan, 4165 yuan and 4547 yuan respectively, up 7.8%, 8.4% and 11.4% month on month; The price of hot rolled sheet and cold rolled sheet per ton was 4676 yuan and 6022 yuan respectively, up 8% and 5.6% month on month
steel inventory fell. According to the statistics of the iron and Steel Association, as of the end of March, the social inventory of steel procts in 26 major cities was 17.29 million tons, which was 800000 tons less than that at the end of February, and the inventory of long and plate procts decreased to varying degrees compared with that at the end of last month
building materials: in the first quarter, the added value of the building materials instry increased by 21.5%, 8.9 percentage points faster than that of the same period last year. The output of cement was 335.85 million tons, a year-on-year increase of 20.3%; The output of flat glass was 153.44 million weight boxes, an increase of 13.7%. From January to February, the building materials instry realized a profit of 18.8 billion yuan, an increase of 97.9% (down 0.5% in the same period last year)
the price of cement continued to rise, while the price of flat glass fell slightly. According to the statistics of the Building Materials Federation, the average ex factory price of cement of key building materials enterprises in March was 293.8 yuan / ton, up 1.3 yuan / ton from February, which has been rising for seven consecutive months since August last year; The average ex factory price of flat glass was 78.2 yuan / weight box, down 1.6 yuan / weight box from February. At the end of March, the cement inventory of key building materials enterprises was 16.45 million tons, a year-on-year decrease of 1.3%; The inventory of flat glass was 18.88 million weight boxes, a year-on-year decrease of 5.9%<
nonferrous metals: in the first quarter, the added value of nonferrous metals instry increased by 23.7%, including 20.7% in March. The output of ten kinds of non-ferrous metals was 7.43 million tons, a year-on-year increase of 36%; The average daily output in March was 83000 tons, an increase of 2.5% over the previous two months. 1.05 million tons of refined copper, an increase of 12.8%; The output of electrolytic aluminum was 3.99 million tons, an increase of 48.3%. Alumina proction reached 7.38 million tons, an increase of 52.7%. From January to February, the non-ferrous metal instry realized a profit of 18.9 billion yuan, an increase of 28.7 times (a decrease of 99.5% in the same period of last year)
the import of main non-ferrous metal procts increased. In the first quarter, the import of unwrought copper and copper procts was 1.07 million tons, up 14.2% year on year, including 21.8% in March; Alumina imports increased by 55.2% to 1.59 million tons, including 82.1% in March; The import of unwrought aluminum and aluminum procts was 257000 tons, which was affected by the higher base in the same period of last year, with a year-on-year decrease of 2.5%, including a decrease of 35.4% in March
the price of nonferrous procts rebounded. In March, the average monthly prices of copper and aluminum in the domestic market were 59110 yuan / ton and 16169 yuan / ton respectively, up 3783 yuan / ton and 89 yuan / ton compared with February (lower than 961 yuan / ton and 784 yuan / ton in January)
chemical instry: in the first quarter, the added value of the chemical instry increased by 23.1% year-on-year, accelerating by 18.6% year-on-year, including an increase of 18.1% in March. Among the main procts, caustic soda, soda and ethylene increased by 22.5%, 24.7% and 19.1% respectively; Pesticide and chemical fertilizer increased by 16.6% and 11.2% respectively. From January to February, the chemical instry realized a profit of 31 billion yuan, an increase of 2.2 times (a decrease of 55.5% in the same period of last year)
the price of chemical procts rises more than falls. Driven by the rise of raw materials, the expected increase of domestic demand and the recovery of the international market, among the 68 kinds of chemical procts monitored by China Chemical Network in March, the prices of 40 kinds of chemical procts showed a rising trend, accounting for more than half of the total; The prices of 22 procts showed a downward trend, and only 6 procts remained stable< In the first quarter of 2010, the added value of equipment instry increased by 25.7%, 5 percentage points higher than that in the fourth quarter of last year, and 19.2 percentage points higher than that in the same period of last year; Among them, the growth rate in March was 23%. The export delivery value of equipment instry increased by 24.1% year on year; According to customs statistics, in the first quarter, China's exports of mechanical and electrical procts reached 189.1 billion yuan, up 31.5% from 20.8% in the same period last year. From January to February, the machinery instry realized a profit of 108 billion yuan, a year-on-year increase of 1.3 times (a year-on-year decrease of 24.3%)
the proction of investment procts rebounded rapidly. In the first quarter, the output of cranes, excavators and loaders increased by 22.7%, 59.7% and 43.4% respectively; the output of cement, oil refining and chemical special equipment increased by 116.5% and 59.5% respectively; the output of metal cutting machines and forming machines increased by 23.5% and 17.8% respectively
automobile proction and sales maintained high growth. According to the statistics of China Association of automobile instry, in the first quarter, China's automobile proction and sales were 4.56 million and 4.61 million respectively, with a year-on-year growth of 77% and 71.8% (1.9% and 3.9% respectively in the same period last year). Small displacement cars continue to sell well. In the first quarter, the sales volume of 1.6L and below passenger cars was 3.52 million, accounting for 70.5% of the total sales volume of passenger cars. In March, the proction and sales of automobiles exceeded 1.7 million, reaching a new record. In March, China's automobile proction and sales reached 1.73 million, with a month on month growth of 43.8% and 43.2%, and a year-on-year growth of 57.7% and 55.8%. From January to February, the auto instry realized a profit of 47.8 billion yuan, an increase of 4.1 times (a decrease of 51.6% in the same period last year)
the proction of shipbuilding instry continued to grow, and the new ship orders were improved. In the first quarter, China's shipbuilding output reached 14.57 million dwt, a year-on-year increase of 128%, accounting for 41.1% of the world market share. New orders of 8.26 million dwt, 10.5 times of the same period last year; At the end of March, orders for hand-held ships were 184.1 million dwt, down 2.2% from the end of 2009< In the first quarter of 2010, the added value of the consumer goods instry increased by 15.5%, 7.7 percentage points higher than that of the previous year; The value of export delivery increased by 18% from 9.5% in the same period last year<
light instry: the added value of light instry increased by 16.4% in the first quarter, 2.1 percentage points faster than that in the fourth quarter of last year, and 8.6 percentage points faster than that in the same period last year. The value of export delivery increased by 19% on a year-on-year basis. From January to February, the light instry realized a profit of 84.2 billion yuan, a year-on-year increase of 54.6% (a year-on-year decrease of 4.2%)
food proction maintained steady growth. The added value of agricultural and sideline food processing, food manufacturing and beverage manufacturing instries increased by 16.1%, 16.6% and 15.4% respectively; Among the main procts, wheat flour increased by 17.9%, refined edible vegetable oil by 13.4%, meat by 31.7%, dairy procts by 8.8%, beverage wine and soft drinks by 11.3% and 18.4% respectively
the policy promotes the proction and sales growth of household appliances. Among the 11 kinds of household appliances monitored in the first quarter, 9 procts grew by more than 20%, while refrigerators, air conditioners and washing machines grew by 27.4%, 30% and 40.7% respectively. In the first quarter, 16.03 million appliances were sold in the countryside, an increase of 16.8% over the fourth quarter of last year; Trade in sales increased by 61.6% on a month on month basis
textile: textile instry increased in the first quarter
since the beginning of this year, the effects of various policies and measures to deal with the international financial crisis have continued to show, and instrial proction has continued the operation trend since the second half of last year and continued to maintain rapid growth. In the case of a low base in the same period of last year, the economic efficiency has improved significantly, the export has improved, and the employment situation has improved. However, the rebound is good, and the foundation still needs to be further consolidated< In the first quarter, the instrial added value was 3526.3 billion yuan, up 14.5% year on year; Among them, the added value of instries above designated size increased by 19.6%, 1.6 percentage points faster than that in the fourth quarter of last year, and 14.5 percentage points faster than that in the same period of last year
the growth of heavy instry was accelerated, and the operation of light instry was stable. In the first quarter, the added value of light and heavy instries (above scale, the same below) increased by 14.1% and 22.1% respectively year-on-year, and the growth rates accelerated by 7.3 and 17.6 percentage points respectively year-on-year; In March, they increased by 13.4% and 20% respectively
the central and western regions grew rapidly. In the first quarter, the added value of instries above Designated Size in the eastern, central and western regions increased by 18.3%, 23.1% and 20.2% year-on-year respectively, including 16.9%, 22.2% and 17.2% in March. In terms of provinces and cities, the growth rate of instries above Designated Size in 23 provinces exceeded 20% in the first quarter, among which Shanxi, Ningxia, Tianjin, Sichuan and Hubei increased by 39.8%, 37.2%, 30.5%, 30.4% and 30.3% respectively; Shandong, Jiangsu, Guangdong, Henan and Liaoning, the major instrial provinces, grew by 21.9%, 21.2%, 16.5%, 27.9% and 22.1% respectively
the export of instrial procts recovered. In the first quarter, the value of export delivery of instries above designated size increased by 25.2% year-on-year (down 16% in the same period of last year) from the low base of last year, and increased by 4.6% over the same period of 2008; The growth rate in March was 25.7%, 3.3 percentage points higher than that in the previous two months. According to customs statistics, China's foreign trade exports in the first quarter amounted to US $316.2 billion, up 28.7% year on year (down 19.7% in the same period of last year), with an increase of 24.3% in March
the growth rate of instrial investment dropped. In the first quarter, the instrial investment was 1225.1 billion yuan, a year-on-year increase of 22.7% (23.9% in March), and the growth rate dropped by 3.5 percentage points; Among them, the investment in manufacturing instry was 956.5 billion yuan, an increase of 25.8%
the ex factory prices of instrial procts and the purchase prices of raw materials, fuel and power rose rapidly, and the pressure of cost driving increased. Since December last year, the ex factory prices of instrial procts and the purchase prices of raw materials, fuels and power have changed from negative to positive and continued to rise. In the first quarter, the ex factory prices of instrial procts increased by 5.2% year-on-year (down 4.6% in the same period of last year), 5.9% in March and 0.5% month on month. Among them, the means of proction and means of living increased by 6.5% and 0.9% respectively. The purchase price of raw materials, fuel and power increased by 9.9% on a year-on-year basis (11.5% on a year-on-year basis and 0.5% on a month on month basis), among which the price of fuel and power increased by 23.5%
the connection between proction and marketing is good. The sales rate of instrial procts nationwide was 97.5%, up 0.5 percentage points year on year. Among them, the proction and marketing rates of light and heavy instries were 97.2% and 97.6% respectively
the operation of instrial enterprises has improved significantly. From January to February, instrial enterprises above Designated Size achieved a profit of 486.7 billion yuan, of which small and medium-sized enterprises achieved a profit of 298.1 billion yuan, up 119.7% and 90.3% year on year respectively; The tax paid was 427.8 billion yuan, an increase of 32.8%; 8% year on year; The loss area was 19.6%, 5.7 percentage points lower than the same period last year
the employment situation of enterprises has improved significantly. The average number of employees in Instrial Enterprises above designated size was 82.32 million, an increase of 3.99 million or 5.1% over the same period of last year (only 0.4% over the same period of last year); Among them, the number of employees of small and medium-sized enterprises was 63.74 million, an increase of 3.43 million or 5.7%< In the first quarter of 2010, the added value of raw material instry increased by 19.3% year-on-year, accelerating by 14.3 percentage points year-on-year; The growth rate in March was 17.4%<
Metallurgy: in the first quarter, the added value of metallurgical instry increased by 20.7%, with a year-on-year increase of 18.7 percentage points; The growth rate in March was 19.4%. The crude steel output was 158.01 million tons, up 24.5% year on year, and the average daily output was 12.8% higher than that of last year; The average daily output in March was 1.773 million tons, 1.7% higher than that in January February. Steel output was 185.75 million tons, up 28.6% year on year. From January to February, the metallurgical instry realized a profit of 29.8 billion yuan, a year-on-year increase of 5.96 times (a year-on-year decrease of 90.1%); The loss of loss making enterprises was 5.57 billion yuan, with a year-on-year decrease of 11.1 billion yuan
the import and export volume of iron and steel increased greatly. In the first quarter, 4.11 million tons of steel were imported, up 27.3% year on year; 8.71 million tons of steel procts were exported, an increase of 69.5%; The import and export of steel billets was equivalent to 4.74 million tons of crude steel net export, an increase of 4.2 times. The import of iron ore kept growing, and the price of ore powder reached new highs. In the first quarter, the import of iron ore was 155.03 million tons, an increase of 18%; Among them, 59.01 million tons of imports were imported in March (9.63 million tons more than last month), an increase of 13.5%. At the end of March, the price of 63.5% Indian iron concentrate powder in Qing port reached 1180 yuan / ton, 220 yuan / ton higher than the highest price last year
steel prices are rising rapidly. In March, the domestic steel market prices rose rapidly in the two months before the end of the stable trend. On March 29, the comprehensive steel price index was 116.81, 7.7 points higher than that at the end of last month, reaching the highest point since the middle of October 2008. According to the statistics of the iron and Steel Instry Association, the price per ton of 6.5mm ordinary line, 16mm rebar and 10mm plate were 4140 yuan, 4165 yuan and 4547 yuan respectively, up 7.8%, 8.4% and 11.4% month on month; The price of hot rolled sheet and cold rolled sheet per ton was 4676 yuan and 6022 yuan respectively, up 8% and 5.6% month on month
steel inventory fell. According to the statistics of the iron and Steel Association, as of the end of March, the social inventory of steel procts in 26 major cities was 17.29 million tons, which was 800000 tons less than that at the end of February, and the inventory of long and plate procts decreased to varying degrees compared with that at the end of last month
building materials: in the first quarter, the added value of the building materials instry increased by 21.5%, 8.9 percentage points faster than that of the same period last year. The output of cement was 335.85 million tons, a year-on-year increase of 20.3%; The output of flat glass was 153.44 million weight boxes, an increase of 13.7%. From January to February, the building materials instry realized a profit of 18.8 billion yuan, an increase of 97.9% (down 0.5% in the same period last year)
the price of cement continued to rise, while the price of flat glass fell slightly. According to the statistics of the Building Materials Federation, the average ex factory price of cement of key building materials enterprises in March was 293.8 yuan / ton, up 1.3 yuan / ton from February, which has been rising for seven consecutive months since August last year; The average ex factory price of flat glass was 78.2 yuan / weight box, down 1.6 yuan / weight box from February. At the end of March, the cement inventory of key building materials enterprises was 16.45 million tons, a year-on-year decrease of 1.3%; The inventory of flat glass was 18.88 million weight boxes, a year-on-year decrease of 5.9%<
nonferrous metals: in the first quarter, the added value of nonferrous metals instry increased by 23.7%, including 20.7% in March. The output of ten kinds of non-ferrous metals was 7.43 million tons, a year-on-year increase of 36%; The average daily output in March was 83000 tons, an increase of 2.5% over the previous two months. 1.05 million tons of refined copper, an increase of 12.8%; The output of electrolytic aluminum was 3.99 million tons, an increase of 48.3%. Alumina proction reached 7.38 million tons, an increase of 52.7%. From January to February, the non-ferrous metal instry realized a profit of 18.9 billion yuan, an increase of 28.7 times (a decrease of 99.5% in the same period of last year)
the import of main non-ferrous metal procts increased. In the first quarter, the import of unwrought copper and copper procts was 1.07 million tons, up 14.2% year on year, including 21.8% in March; Alumina imports increased by 55.2% to 1.59 million tons, including 82.1% in March; The import of unwrought aluminum and aluminum procts was 257000 tons, which was affected by the higher base in the same period of last year, with a year-on-year decrease of 2.5%, including a decrease of 35.4% in March
the price of nonferrous procts rebounded. In March, the average monthly prices of copper and aluminum in the domestic market were 59110 yuan / ton and 16169 yuan / ton respectively, up 3783 yuan / ton and 89 yuan / ton compared with February (lower than 961 yuan / ton and 784 yuan / ton in January)
chemical instry: in the first quarter, the added value of the chemical instry increased by 23.1% year-on-year, accelerating by 18.6% year-on-year, including an increase of 18.1% in March. Among the main procts, caustic soda, soda and ethylene increased by 22.5%, 24.7% and 19.1% respectively; Pesticide and chemical fertilizer increased by 16.6% and 11.2% respectively. From January to February, the chemical instry realized a profit of 31 billion yuan, an increase of 2.2 times (a decrease of 55.5% in the same period of last year)
the price of chemical procts rises more than falls. Driven by the rise of raw materials, the expected increase of domestic demand and the recovery of the international market, among the 68 kinds of chemical procts monitored by China Chemical Network in March, the prices of 40 kinds of chemical procts showed a rising trend, accounting for more than half of the total; The prices of 22 procts showed a downward trend, and only 6 procts remained stable< In the first quarter of 2010, the added value of equipment instry increased by 25.7%, 5 percentage points higher than that in the fourth quarter of last year, and 19.2 percentage points higher than that in the same period of last year; Among them, the growth rate in March was 23%. The export delivery value of equipment instry increased by 24.1% year on year; According to customs statistics, in the first quarter, China's exports of mechanical and electrical procts reached 189.1 billion yuan, up 31.5% from 20.8% in the same period last year. From January to February, the machinery instry realized a profit of 108 billion yuan, a year-on-year increase of 1.3 times (a year-on-year decrease of 24.3%)
the proction of investment procts rebounded rapidly. In the first quarter, the output of cranes, excavators and loaders increased by 22.7%, 59.7% and 43.4% respectively; the output of cement, oil refining and chemical special equipment increased by 116.5% and 59.5% respectively; the output of metal cutting machines and forming machines increased by 23.5% and 17.8% respectively
automobile proction and sales maintained high growth. According to the statistics of China Association of automobile instry, in the first quarter, China's automobile proction and sales were 4.56 million and 4.61 million respectively, with a year-on-year growth of 77% and 71.8% (1.9% and 3.9% respectively in the same period last year). Small displacement cars continue to sell well. In the first quarter, the sales volume of 1.6L and below passenger cars was 3.52 million, accounting for 70.5% of the total sales volume of passenger cars. In March, the proction and sales of automobiles exceeded 1.7 million, reaching a new record. In March, China's automobile proction and sales reached 1.73 million, with a month on month growth of 43.8% and 43.2%, and a year-on-year growth of 57.7% and 55.8%. From January to February, the auto instry realized a profit of 47.8 billion yuan, an increase of 4.1 times (a decrease of 51.6% in the same period last year)
the proction of shipbuilding instry continued to grow, and the new ship orders were improved. In the first quarter, China's shipbuilding output reached 14.57 million dwt, a year-on-year increase of 128%, accounting for 41.1% of the world market share. New orders of 8.26 million dwt, 10.5 times of the same period last year; At the end of March, orders for hand-held ships were 184.1 million dwt, down 2.2% from the end of 2009< In the first quarter of 2010, the added value of the consumer goods instry increased by 15.5%, 7.7 percentage points higher than that of the previous year; The value of export delivery increased by 18% from 9.5% in the same period last year<
light instry: the added value of light instry increased by 16.4% in the first quarter, 2.1 percentage points faster than that in the fourth quarter of last year, and 8.6 percentage points faster than that in the same period last year. The value of export delivery increased by 19% on a year-on-year basis. From January to February, the light instry realized a profit of 84.2 billion yuan, a year-on-year increase of 54.6% (a year-on-year decrease of 4.2%)
food proction maintained steady growth. The added value of agricultural and sideline food processing, food manufacturing and beverage manufacturing instries increased by 16.1%, 16.6% and 15.4% respectively; Among the main procts, wheat flour increased by 17.9%, refined edible vegetable oil by 13.4%, meat by 31.7%, dairy procts by 8.8%, beverage wine and soft drinks by 11.3% and 18.4% respectively
the policy promotes the proction and sales growth of household appliances. Among the 11 kinds of household appliances monitored in the first quarter, 9 procts grew by more than 20%, while refrigerators, air conditioners and washing machines grew by 27.4%, 30% and 40.7% respectively. In the first quarter, 16.03 million appliances were sold in the countryside, an increase of 16.8% over the fourth quarter of last year; Trade in sales increased by 61.6% on a month on month basis
textile: textile instry increased in the first quarter
5. 2010 Tianjin junior high school graate academic examination paper - Chemistry (Volume I)
(2010-08-26 22:04:16)
reprinted
label:
Ecation
this paper is divided into two parts: Volume I (multiple choice questions) and volume II (non multiple choice questions). Volume I, pages 1 to 3, Volume II, pages 4 to 8. The full score of the paper is 100. The examination time is 70 minutes<
Volume I
possible relative atomic mass H 1 C 12 N 14 o 16 Si 28
I. multiple choice question (10 sub questions in total, 2 points for each sub question, 20 points in total) only one of the four options given in each sub question is the most suitable one< At the world climate conference held in Copenhagen in 2009, countries jointly negotiated measures to rece greenhouse gas emissions. The Chinese theme of World Environment Day 2010 is "low carbon emission rection, green life". Using the following energy sources can rece greenhouse gas emissions is
A. solar energy B. coal C. petroleum D. natural gas
2. Among the following changes, the chemical change is
A. dripping water into ice B. alcohol burning C. glass breaking D. watermelon juice pressing
3 "Iodine" in high calcium milk refers to
A. simple substance B. molecule C. atom D. element
4. Human body needs energy for activities and maintaining constant body temperature. The following substances mainly provide energy for human body are
A. inorganic salt B. water C. carbohydrate D. vitamin
5, 6. Iodine pentoxide (i2o5) can be used to determine the content of carbon monoxide in the air. The valence of iodine in i2o5 is
A. - 5 B. + 3 C. + 5 d. + 2
7, In the following experimental operations, the incorrect ones are
9, What does not need to be sealed is
A. sodium hydroxide B. concentrated sulfuric acid C. sodium chloride D. concentrated hydrochloric acid
10, The following statement is correct
A. sulfur is a metal element
B. There are 16 protons in the sulfur nucleus
C. the relative atomic mass of sulfur is 16
D. sulfur atoms are easy to lose electrons in chemical reactions
2. Multiple choice questions (5 sub questions in total, 2 points for each sub question, 10 points in total), There are 1-2 most suitable for the topic. If there is only one choice that meets the meaning of the question, multiple choices will not score; If there are two choices that are in line with the meaning of the question, only one choice that is in line with the meaning of the question will get 1 point. If there is one choice that is not in line with the meaning of the question, no point will be given<
11. The following safety measures are
A. lighting with torch when entering the coal mine
B. lighting with torch when exploring in karst cave
C. concting torch experiment before employing idle biogas
D. checking whether the liquefied petroleum gas tank leaks by igniting wooden sticks
12 A. Its aqueous solution can make litmus solution turn red
B. It can remove oil stains and can be used as kitchen cleaner
C. solid sodium hydroxide can be used as carbon dioxide desiccant
D. if sodium hydroxide solution is accidentally stained on the skin, it should be washed with more water, Then apply boric acid solution
13 The mass ratio of n is 3:4
B. the mass fraction of nitrogen in silicon nitride is 40%
C. the mass of silicon element in 140g silicon nitride is 84g
D. the relative molecular mass of silicon nitride is 140g
14, The two methods are correct
Options
substances to be identified
methods and reagents added
method 1
method 2
a
dilute hydrochloric acid and sodium hydroxide solution
test with pH test paper
add copper sulfate solution
< B
calcium carbonate and barium sulfate solution
add enough water
Add hydrochloric acid
C
dilute hydrochloric acid and dilute sulfuric acid
drop barium chloride solution
drop purple litmus solution
d
ammonium sulfate and phosphate rock powder
observe color
add sufficient water
15 B. remove a small amount of CaCO3 from Cao: add enough dilute hydrochloric acid to fully react
C. remove a small amount of MgCl2 from KCl solution: add an appropriate amount of NaOH solution and filter
D. remove a small amount of AgNO3 from Cu (NO3) 2 solution: add enough copper powder, The relative atomic mass H 1 C 12 N 14 o 16 Na 23 CL 35.5 K 39 Fe 56 that may be used in full reaction filtration
3. For the existing helium, oxygen, salt, activated carbon, methane, carbon dioxide and ammonium nitrate, please fill in the blanks according to the following requirements:
(1) the gas that can be supplied for human respiration is
(2) what is used as seasoning in cooking< (3) it can be used as nitrogen fertilizer
(4) the main components of natural gas are as follows:
(5) can be used as refrigerator deodorant is
(6) the gas that can be filled into the neon lamp and emit colored light when it is powered on is
(7) what green plants absorb in photosynthesis is
17. (4 points) chemistry is a very practical science, the application of chemical knowledge can help us to explain many problems. For example:
(1) rust can be removed with appropriate amount of dilute sulfuric acid, and the chemical equation of the reaction is as follows:
(2) a layer of white solid insoluble in water often forms in the reagent bottle filled with lime water for a long time. Please use the chemical equation to express the reason for the formation of white solid
18. (2 points) carbon dioxide is the main greenhouse gas, but it is also a valuable carbon and oxygen resource. Urea [CO (NH2) 2] was synthesized from CO2 and NH3 under high temperature and high pressure, and water was generated at the same time. This is a successful example of carbon dioxide fixation and utilization. Please write down the chemical equation of the reaction
19. (7 points) select three kinds of solid from soda ash, zinc particle, quicklime and anhydrous copper sulfate and add them to a certain amount of water and dilute hydrochloric acid respectively. The phenomenon is shown in the table below<
solid a
solid B
solid C
water
solid does not dissolve
forms white turbidity and releases a lot of heat
white solid graally dissolves
dilute hydrochloric acid
solid graally decreases,
a large number of bubbles are proced
white solid decreases,
no bubbles are proced, And a lot of heat is released
white solid is reced,
a lot of bubbles are proced
(1) from the above experiments, it can be inferred that solid B is, solid C is
(2) the chemical equation for the reaction of solid a with dilute hydrochloric acid is as follows; The chemical equation for the reaction of solid B with water is, and the reaction type is< (8 points) write the chemical equation of the following reaction:
(1) charcoal is fully burned in oxygen to proce carbon dioxide
under heating conditions, hydrogen reacts with copper oxide to form copper and water< (3) high temperature combustion of limestone< (4) dilute sulfuric acid reacts with barium nitrate solution< (2) there are three kinds of metals, x, y and Z, which can react as follows: y + 2xno3 = y (NO3) 2 + 2x, Z + yso4 = zso4 + y. The order of metal activity of X, y and Z is from strong to weak
22. (6 points) aluminum, iron and copper are common metals in our life
(1) among the following daily necessities, metal with good thermal conctivity is mainly used (fill in the serial number)
(2) aluminum has good corrosion resistance because of its high corrosion resistance
(3) at high temperature, iron can be reced from iron ore by carbon monoxide proced by the reaction of coke and oxygen. In theory, a pig iron containing 96% iron can be proced from 1000t hematite ore containing 80% iron oxide in an iron making plant, and the mass of pig iron is t The result is accurate to 0.1)
(4) when the worker cuts the iron plate, he can draw a line on the iron plate with copper nitrate solution to leave a red mark. The chemical equation of the reaction is
23. (4 points) please answer the question according to the following experiment and solubility curve: (the known density of water is about 1g / cm3)
experimental operation
experimental results
take 100g water, add 25g potassium nitrate, stir, recover to 20 ℃
dissolve completely, get solution ①
Add WG potassium nitrate, stir, recover to 20 ℃
just saturated, To obtain solution ②
Add 25g potassium nitrate, stir and recover to 20 ℃
to obtain solution ③
heating
dissolving completely to obtain solution ④
cooling to 20 ℃
precipitation of crystals to obtain solution ⑤
(1) the mass of solution in ③ is g; It must belong to unsaturated solution (fill in the serial number, the same below); The mass fraction of solute must be equal
(2) the quality of precipitated crystals is< 25 g B. (W + 25) C. (W + 50) g
v. experiment questions (3 questions in total, 20 points in total)
24. (3 points) experiments are often carried out in learning and researching chemistry
(1) in the experiment of burning sulfur in oxygen, a colored flame can be observed
(2) when diluting concentrated sulfuric acid, it is necessary to slowly inject sulfuric acid along the wall of the reactor and continuously stir it with a glass rod
(3) pay special attention to safety when using hydrogen. Before igniting the hydrogen, be sure to
25. (9 points) according to the following experimental device diagram, answer relevant questions as required
(1) write the names of the labeled instruments in the figure: A, B
(2) when using potassium permanganate to proce and collect oxygen, the device to be selected is (fill in the serial number, the same below). The function of putting a ball of cotton at the test tube mouth is as follows; The chemical equation of potassium permanganate decomposition to oxygen is
(3) in the laboratory, zinc particles react with dilute sulfuric acid to proce and collect hydrogen
(4) the equipment is often used to proce and collect carbon dioxide in the laboratory, and the collection method is based on
26. (8 points)
(2010-08-26 22:04:16)
reprinted
label:
Ecation
this paper is divided into two parts: Volume I (multiple choice questions) and volume II (non multiple choice questions). Volume I, pages 1 to 3, Volume II, pages 4 to 8. The full score of the paper is 100. The examination time is 70 minutes<
Volume I
possible relative atomic mass H 1 C 12 N 14 o 16 Si 28
I. multiple choice question (10 sub questions in total, 2 points for each sub question, 20 points in total) only one of the four options given in each sub question is the most suitable one< At the world climate conference held in Copenhagen in 2009, countries jointly negotiated measures to rece greenhouse gas emissions. The Chinese theme of World Environment Day 2010 is "low carbon emission rection, green life". Using the following energy sources can rece greenhouse gas emissions is
A. solar energy B. coal C. petroleum D. natural gas
2. Among the following changes, the chemical change is
A. dripping water into ice B. alcohol burning C. glass breaking D. watermelon juice pressing
3 "Iodine" in high calcium milk refers to
A. simple substance B. molecule C. atom D. element
4. Human body needs energy for activities and maintaining constant body temperature. The following substances mainly provide energy for human body are
A. inorganic salt B. water C. carbohydrate D. vitamin
5, 6. Iodine pentoxide (i2o5) can be used to determine the content of carbon monoxide in the air. The valence of iodine in i2o5 is
A. - 5 B. + 3 C. + 5 d. + 2
7, In the following experimental operations, the incorrect ones are
9, What does not need to be sealed is
A. sodium hydroxide B. concentrated sulfuric acid C. sodium chloride D. concentrated hydrochloric acid
10, The following statement is correct
A. sulfur is a metal element
B. There are 16 protons in the sulfur nucleus
C. the relative atomic mass of sulfur is 16
D. sulfur atoms are easy to lose electrons in chemical reactions
2. Multiple choice questions (5 sub questions in total, 2 points for each sub question, 10 points in total), There are 1-2 most suitable for the topic. If there is only one choice that meets the meaning of the question, multiple choices will not score; If there are two choices that are in line with the meaning of the question, only one choice that is in line with the meaning of the question will get 1 point. If there is one choice that is not in line with the meaning of the question, no point will be given<
11. The following safety measures are
A. lighting with torch when entering the coal mine
B. lighting with torch when exploring in karst cave
C. concting torch experiment before employing idle biogas
D. checking whether the liquefied petroleum gas tank leaks by igniting wooden sticks
12 A. Its aqueous solution can make litmus solution turn red
B. It can remove oil stains and can be used as kitchen cleaner
C. solid sodium hydroxide can be used as carbon dioxide desiccant
D. if sodium hydroxide solution is accidentally stained on the skin, it should be washed with more water, Then apply boric acid solution
13 The mass ratio of n is 3:4
B. the mass fraction of nitrogen in silicon nitride is 40%
C. the mass of silicon element in 140g silicon nitride is 84g
D. the relative molecular mass of silicon nitride is 140g
14, The two methods are correct
Options
substances to be identified
methods and reagents added
method 1
method 2
a
dilute hydrochloric acid and sodium hydroxide solution
test with pH test paper
add copper sulfate solution
< B
calcium carbonate and barium sulfate solution
add enough water
Add hydrochloric acid
C
dilute hydrochloric acid and dilute sulfuric acid
drop barium chloride solution
drop purple litmus solution
d
ammonium sulfate and phosphate rock powder
observe color
add sufficient water
15 B. remove a small amount of CaCO3 from Cao: add enough dilute hydrochloric acid to fully react
C. remove a small amount of MgCl2 from KCl solution: add an appropriate amount of NaOH solution and filter
D. remove a small amount of AgNO3 from Cu (NO3) 2 solution: add enough copper powder, The relative atomic mass H 1 C 12 N 14 o 16 Na 23 CL 35.5 K 39 Fe 56 that may be used in full reaction filtration
3. For the existing helium, oxygen, salt, activated carbon, methane, carbon dioxide and ammonium nitrate, please fill in the blanks according to the following requirements:
(1) the gas that can be supplied for human respiration is
(2) what is used as seasoning in cooking< (3) it can be used as nitrogen fertilizer
(4) the main components of natural gas are as follows:
(5) can be used as refrigerator deodorant is
(6) the gas that can be filled into the neon lamp and emit colored light when it is powered on is
(7) what green plants absorb in photosynthesis is
17. (4 points) chemistry is a very practical science, the application of chemical knowledge can help us to explain many problems. For example:
(1) rust can be removed with appropriate amount of dilute sulfuric acid, and the chemical equation of the reaction is as follows:
(2) a layer of white solid insoluble in water often forms in the reagent bottle filled with lime water for a long time. Please use the chemical equation to express the reason for the formation of white solid
18. (2 points) carbon dioxide is the main greenhouse gas, but it is also a valuable carbon and oxygen resource. Urea [CO (NH2) 2] was synthesized from CO2 and NH3 under high temperature and high pressure, and water was generated at the same time. This is a successful example of carbon dioxide fixation and utilization. Please write down the chemical equation of the reaction
19. (7 points) select three kinds of solid from soda ash, zinc particle, quicklime and anhydrous copper sulfate and add them to a certain amount of water and dilute hydrochloric acid respectively. The phenomenon is shown in the table below<
solid a
solid B
solid C
water
solid does not dissolve
forms white turbidity and releases a lot of heat
white solid graally dissolves
dilute hydrochloric acid
solid graally decreases,
a large number of bubbles are proced
white solid decreases,
no bubbles are proced, And a lot of heat is released
white solid is reced,
a lot of bubbles are proced
(1) from the above experiments, it can be inferred that solid B is, solid C is
(2) the chemical equation for the reaction of solid a with dilute hydrochloric acid is as follows; The chemical equation for the reaction of solid B with water is, and the reaction type is< (8 points) write the chemical equation of the following reaction:
(1) charcoal is fully burned in oxygen to proce carbon dioxide
under heating conditions, hydrogen reacts with copper oxide to form copper and water< (3) high temperature combustion of limestone< (4) dilute sulfuric acid reacts with barium nitrate solution< (2) there are three kinds of metals, x, y and Z, which can react as follows: y + 2xno3 = y (NO3) 2 + 2x, Z + yso4 = zso4 + y. The order of metal activity of X, y and Z is from strong to weak
22. (6 points) aluminum, iron and copper are common metals in our life
(1) among the following daily necessities, metal with good thermal conctivity is mainly used (fill in the serial number)
(2) aluminum has good corrosion resistance because of its high corrosion resistance
(3) at high temperature, iron can be reced from iron ore by carbon monoxide proced by the reaction of coke and oxygen. In theory, a pig iron containing 96% iron can be proced from 1000t hematite ore containing 80% iron oxide in an iron making plant, and the mass of pig iron is t The result is accurate to 0.1)
(4) when the worker cuts the iron plate, he can draw a line on the iron plate with copper nitrate solution to leave a red mark. The chemical equation of the reaction is
23. (4 points) please answer the question according to the following experiment and solubility curve: (the known density of water is about 1g / cm3)
experimental operation
experimental results
take 100g water, add 25g potassium nitrate, stir, recover to 20 ℃
dissolve completely, get solution ①
Add WG potassium nitrate, stir, recover to 20 ℃
just saturated, To obtain solution ②
Add 25g potassium nitrate, stir and recover to 20 ℃
to obtain solution ③
heating
dissolving completely to obtain solution ④
cooling to 20 ℃
precipitation of crystals to obtain solution ⑤
(1) the mass of solution in ③ is g; It must belong to unsaturated solution (fill in the serial number, the same below); The mass fraction of solute must be equal
(2) the quality of precipitated crystals is< 25 g B. (W + 25) C. (W + 50) g
v. experiment questions (3 questions in total, 20 points in total)
24. (3 points) experiments are often carried out in learning and researching chemistry
(1) in the experiment of burning sulfur in oxygen, a colored flame can be observed
(2) when diluting concentrated sulfuric acid, it is necessary to slowly inject sulfuric acid along the wall of the reactor and continuously stir it with a glass rod
(3) pay special attention to safety when using hydrogen. Before igniting the hydrogen, be sure to
25. (9 points) according to the following experimental device diagram, answer relevant questions as required
(1) write the names of the labeled instruments in the figure: A, B
(2) when using potassium permanganate to proce and collect oxygen, the device to be selected is (fill in the serial number, the same below). The function of putting a ball of cotton at the test tube mouth is as follows; The chemical equation of potassium permanganate decomposition to oxygen is
(3) in the laboratory, zinc particles react with dilute sulfuric acid to proce and collect hydrogen
(4) the equipment is often used to proce and collect carbon dioxide in the laboratory, and the collection method is based on
26. (8 points)
6. That's it. One day, Qian's QQ has a strange man to add her, she faintly felt that the man is Lin, but she still added. As a result, it was really Lin. they talked for a long time. When Qian learned that Lin was the manager of a company in Northwest China, she thought her husband was too worthless. When she got home, she saw a fish in the aquarium with its belly up, so she fished it out and threw it away. When Gong came back, he found a fish missing and asked his wife, "where's my second aunt?" "I saw it belly up and threw it away," she said coldly“ No, it takes a break like this every day After hearing this, Qian was very angry: "you know that you stay at home all day, and you are not the same as others?" After hearing this, Gong asked without a trace of expression, "is he what you mean by 'others' Qian gives Gong a big mouth. Without saying a word, Gong gently closes the door and leaves home. It's been two days, and Gong hasn't come home. Qian also knows that she's going too far, but she's embarrassed to call. She suddenly thinks of Gong's diary. Gong won't let her read it. This time, she can read it
open the diary, page 1:
open the diary, page 1:
7. H is hero
PT is platform
PT is platform
8. H is hero
PT is platform
PT is platform
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