Papermaking: ninth grade chemistry preparation group
The total score of the topic is one two three four five.
Take the lead
Chemistry is around us, and life is full of chemistry everywhere; Chemistry is the most useful and creative central subject in 2 1 century. Experimental inquiry is an important means to learn chemistry. I believe that after one month's study, your autonomous learning ability and inquiry learning ability have been greatly improved. Please give full play to your thinking and answer questions actively. I believe that as long as you answer the questions carefully, you will get satisfactory results!
1. Multiple choice questions (each question has only one correct answer. Fill in the serial number of the correct answer in the table below. Each small question 1 point, *** 14 point)
The title is123455678 910121314.
answer
1. Chemistry is a very interesting subject. Chemistry takes matter as the research object. Please judge that the following substances are not closely related to chemical research.
① Plastic ② Synthetic fiber ③ Electromagnetic wave ④ protein ⑧ Preservative ⑧ Stomach medicine ⑧ Flour ⑧ Sunlight.
A.①③ B.②④ C.③⑦ D.③⑧
2. In chemistry class, Hao Ying suggested that clarified limewater can be used to test whether human gas is carbon dioxide gas. As far as this process is concerned, it belongs to the scientific inquiry link.
A. Establish hypotheses B. Collect evidence C. Design experiments D. Draw conclusions
3. When taking liquid medicine, if the dosage is not specified, the minimum amount that should be taken generally is
A. 0.5 ml b. 1 ml ~ 2 ml c. 3 ml ~ 4 ml d. 5 ml ~ 6 ml
4, the following changes, belong to the chemical change is
A. alcohol volatilization B. wet clothes drying C. seawater exposure D. gunpowder explosion
5, air content is more, more inert gas.
A. oxygen B. nitrogen C. carbon dioxide D. water vapor
6, the following substances, which belong to the mixture is
A. hydrogen b sodium chloride c air d copper
7. The following properties of test paper belong to its chemical properties:
A, white b, insoluble in water c, easy to tear d, flammable.
8. In the laboratory, I accidentally knocked over the alcohol lamp on the table and burned myself. Reasonable and simple fire extinguishing method is
A. Rinse it out with water. B. Knock it out with a book. C. Blow it out with your mouth. D. Cover it with a wet rag.
9, the following instruments can be used to heat solids and liquids are
A. beaker B. evaporating dish C. measuring cylinder D. test tube
10, the following experimental operations are correct.
A. put your nose at the mouth of the container to smell the gas.
B) Save medicines and put more medicines back to the original reagent bottle.
C blocky and non-corrosive drugs are allowed to be taken directly by hand.
D. When using the tray balance to weigh substances, tweezers should be used to hold the weights.
1 1, when doing magnesium belt combustion experiment, the instruments needed are as follows
A. Crucible pliers and asbestos mesh B. Test tube clamps and beakers
C. Iron frame and test tube D. Burning spoon and iron clip
12, the first scientist to determine the composition of air through experiments is
A. French lavoisier British Thomson
C. Scheler in Sweden and Avo Ghadel in Italy
13, the following conditions will not cause environmental pollution is
A. Carbon dioxide and sulfur dioxide produced by coal combustion B. Setting off fireworks and firecrackers
C. carbon dioxide exhaled by people and animals D. tail gas emitted by cars
14, in the magnesium bar combustion experiment, the phenomenon that can best explain this change is a chemical change is
A. magnesium strips become smaller. B. release a lot of heat
C, emitting dazzling white light d and generating white solid.
Second, multiple-choice questions (each question has only one correct answer, fill in the correct answer number in the table below. 2 points for each small question, ***24 points)
Title1516171819 202122 23 24 25 26
answer
15. At present, the daily monitoring items of air quality in national key cities do not include
A, sulfur dioxide (SO2) B, carbon dioxide (CO2)
C, nitrogen dioxide (NO2) D, total suspended particulate matter (TSP)
16. the mass of a C- 12 atom is m kg, and the mass of an element atom is n kg, so the relative atomic mass of the element atom is
/12nb.n/12mc.12n/MD.12m/n.
17. When students use Tian Ping, put the weight on the left panel and the weighed object on the right panel, and the weighing result is10.6g (roaming code is used below1g). The actual mass of the weighed object shall be
a . 10g b . 1 1.2g c . 9.4g d . 10.6g
18. Among the following descriptions about molecules, atoms and ions, it is incorrect.
A. They are all electrically neutral particles. They can keep the chemical properties of substances.
C. They can all form substances directly. D. They are all in constant motion.
19. Core
A consists of electrons and protons. B consists of protons and neutrons.
C consists of electrons and neutrons. D consists of protons, neutrons and electrons.
20. In the operation of using test tubes to clamp test tubes, the following is correct.
A. The test tube clamp is inserted downward from the test tube mouth and clamped in the middle and upper part of the test tube.
B. Insert the test tube clamp downward from the test tube opening and clamp it on the upper part of the test tube.
C. The test tube clamp is inserted upward from the bottom of the test tube and clamped on the upper part of the test tube.
D. The test tube clamp is inserted upward from the bottom of the test tube and clamped in the middle and upper part of the test tube.
The structural diagram of 2 1. atom is wrong about this element.
A, the number of protons in the nucleus is 16? B, there are three electron shells outside the nucleus.
C, the outermost electron number of the atom is 6 D, which belongs to metal elements.
22. In the anti-drug operation, well-trained anti-drug dogs have repeatedly made remarkable achievements. The reason it can smell drugs is
A. molecules are constantly moving. Molecules are separable.
C. the molecule is very small. D. there are gaps between molecules.
Chemistry is closely related to our health. Among the following statements, unreasonable.
A. Deteriorated food usually contains mycotoxin and cannot be eaten.
B. rotten apples can be eaten safely after cutting off the rotten parts.
C. Children should not blindly eat various nutritional supplements.
For the health of yourself and others, refuse tobacco and stay away from drugs.
24. The smallest particles that keep the chemical properties of oxygen are
A. oxygen molecule oxygen atom oxygen ion oxygen
25. From a chemical point of view, the following advertising terms are not scientifically wrong.
A. "K" brand coffee has a strong aroma and contains no chemicals.
B. "Snow Mountain" brand mineral water, real pure water.
C. "Nature" brand vegetables are naturally grown and contain no elements, so they are truly "green" foods.
D Eating qualified iodized salt can prevent some thyroid diseases.
26. The following statement is correct: A. The mass fraction of oxygen in the air is 2 1%.
B. the proportion of each component in the air is eternal. Air is a mixture of many substances.
D. The more air quality levels, the better the air quality.
Iii. Fill in the blanks (25 points)
27.(4 points) is the smallest particle that keeps the chemical properties of mercury oxide. In the chemical change of thermal decomposition of mercuric oxide, mercuric oxide is decomposed into mercury and oxygen, in which mercury directly constitutes metallic mercury and two oxygen forms one oxygen; A large amount of oxygen constitutes oxygen.
28.(3 points) There are many ways to determine the composition of air. Figure 1 is the determination method of red phosphorus burned by Xiao Ming in the air. The experimental process is:
Step 1: Divide the volume of the gas container into five equal parts and mark them.
Step 2: ignite the red phosphorus in the burning spoon, put it into the gas container and plug the plug.
Step 3: After the red phosphorus is extinguished and cooled, open the spring clip and find that the water is sucked away (Figure 1).
The volume of water entering the gas cylinder is about 1/5 of the total volume of the gas cylinder. Please answer the following questions:
(1) The above experiments also prove that the chemical properties of nitrogen are.
(2) After the experiment, if the volume of water entering the gas container is less than 1/5 of the total volume,
Do you think the reason for this result may be (write one)
.
(3) A classmate reflected on the experiment and put forward suggestions for improvement.
Method (as shown in figure 2), do you think the advantages of the improvement are:
. .
29.(5 points) Among the six particles of molecules, atoms, protons, electrons, neutrons and nuclei:
(1) can directly form substances.
(2) positively charged particles
(3) negatively charged particles
(4) uncharged particles
(5) Particles with the smallest mass
30.(6 points) expressed by chemical symbols:
(1) silicon (2) argon (3) magnesium oxide
(4) Water (5) Magnesium ion (6) Sulfur ion
3 1.(4 points) The following table lists the main components of the "atmosphere" on several planets (equivalent to the air on the earth).
The main component of the "atmosphere" on the earth.
Jupiter ammonia, helium, hydrogen, methane.
Mercury has no gas.
Pluto methane
Mars carbon dioxide nitrogen
According to the information provided in the table and the relevant knowledge you have learned, analyze the following questions:
(1) Among several planets in the table, the planet containing rare gas is _ _ _ _ _ _ _ _.
(2) Try to guess that the temperature of the "atmosphere" on Mars is _ _ _ _ _ higher than the temperature of the atmosphere on the earth's surface (fill in "high" or "low").
_ _ _ _ _ _ _ Liquid water on the surface of mercury (fill in "Yes" or "No")
(3) Methane is a combustible gas, but the flame from the rocket can't ignite the methane on Pluto. Because: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.
32.(3 points) Daily air quality report mainly includes: primary pollutants, air pollution index and air quality grade. Correspondence between air pollution and air quality grade (table 1)
The air pollution index is 0 ~ 50 565 438+0 ~1001~1501~ 200 201~ 300.
The air quality is excellent, good and light. I'm light, II'm moderate, I'm moderate and II'm heavy.
Air quality grade Ⅰ Ⅱ Ⅲ Ⅴ Ⅴ
2011September 10 Daily Air Quality Report of Some Cities in China (Table 2)
Air pollution index and air quality grade of major pollutants in cities
Lanzhou inhalable particulate matter115 Ⅲ light pollution.
The inhalable particulate matter 75 Ⅱ in Guangdong is better.
Tianshui sulfur dioxide 63 Ⅱ Liang
Dalian /25
The city with the worst air quality is.
Please determine the air quality grade of Dalian on that day according to the contents in Table 1 and Table 2, and fill in the blanks in Table 2.
(3) The pollutants that have the greatest impact on pollution in our city are.
Four, experiment and inquiry questions (***24 points)
33.(6 points) Fill in the blanks with the serial numbers of the following instruments:
① Measuring cylinder ② Test tube ③ Alcohol lamp ④ beaker ⑤ sink ⑤ rubber dropper ⑤ gas container.
(1), commonly used when sucking a small amount of liquid;
(2), when using drainage method to collect gas, commonly used;
(3), heating materials, commonly used.
(4), when measuring a certain volume of liquid, commonly used.
(5), can directly heat the instrument is.
(6), used to heat a variety of liquids or prepare solutions of the instrument is.
34.(4 points) Point out the consequences caused by the following operations.
(1) Throwing solid drugs directly into the bottom of the test tube will lead to the following consequences.
(2) When pouring liquid, the label is not aimed at the palm of your hand, and the consequence is.
(3) After using the rubber dropper, other reagents will be absorbed without cleaning, and the consequences will be.
(4) Ignite another alcohol lamp with a burning alcohol lamp, and the consequences are.
35.(6 points) Take a matchstick, grab one end, and quickly lay it flat in the flame of the alcohol lamp (as shown on the right). It was observed that the matchstick at _ _ _ _ _ _ _ _ _ (fill in the serial number) carbonized first about 2 s after it was taken out, indicating the flame temperature of _ _ _ _ _ _ _ _. Therefore, when heating, the test tube should be placed on the _ _ _ _ _ flame of the alcohol lamp.
Then cover a dry beaker above the flame, and the inner wall of the beaker will appear. After a while, take off the beaker, quickly pour a small amount of clear lime water into the beaker, shake it well and find it. Conclusion: The products of alcohol combustion are.
36.(8 points) Please fill in the following table (fill in the lines) according to the activities and inquiry in "What's the difference between the air we breathe in and the air we breathe out".
Explore the purpose of the experiment, operate the experimental phenomenon and draw a conclusion.
Compare carbon dioxide gas in the air with exhaled gas.
Take a bottle of air and a bottle of exhaled gas, one drop each.
Add clarified lime water and shake well.
There is more oxygen in the air than in the exhaled air.
The exhaled dry glass sheet becomes blurred, and there is a layer of water mist on the glass sheet, but there is no water mist on the glass sheet placed in the air.
V. Calculation problem (* *13)
37.(6 points) It is known that the density of air is 1.293g/L and the density of oxygen is 1.429g/L under standard conditions. The air under the existing standard conditions is 1000ml, which is to calculate how many g of oxygen it contains?
38.(7 points) It is known that the mass of an atom is 5.885× 10kg. Find the relative atomic mass of this atom, write the name of the atom, and point out how many extra-nuclear electrons this atom contains. (The mass of carbon atoms is known as1.993x10kg).