Relative atomic mass: h-1c-12o-16mg-24cl-35.5ca-40fe-56n-14cu-64.
First, multiple-choice questions (this question contains 15 questions, each with 2 points and * * * 30 points).
1, among the following changes, chemical changes are
A. burning red phosphorus B. melting ice into water C. crushing ore D. bending copper wire
2, the use of the following substances mainly use their chemical properties are
A. Use diamonds as tools. B. Use water as solvent.
C. seed selection with 16% salt solution D. breathing oxygen.
3. The following statement is correct
A. Iron is the most abundant metal element in the earth's crust.
Stainless steel is steel that never rusts.
Pig iron can be completely dissolved in enough dilute hydrochloric acid.
D. A chain is often dragged to the ground at the tail of an oil tanker to make use of the conductivity of iron.
4. Sodium bromate (NaBrO3) is the main component of cold perm essence. If it is not used properly, it will irritate the scalp and lead to dermatitis. The valence of bromine in sodium bromate is
a 、+5 B 、+4 C 、+3 D 、- 1
5. The following fire control measures are incorrect.
A, the oil pan is on fire-put it out with a lid; B, the library is on fire-put it out with a carbon dioxide fire extinguisher.
C, the house is on fire-put out the fire with a high-pressure water gun D, the TV is on fire-put out the fire with water.
6. The following experimental operation is correct.
7. The methods of purifying water are: ① filtration; (2) Alum is added for adsorption and precipitation; ③ distillation; ④ Disinfection and sterilization. In order to purify natural water mixed with sediment into tap water for domestic use, the methods and sequences to be selected are as follows.
(A)①②③④ (B)②④①③ (C)②①④ (D)①③④
8, among the following substances, belong to the mixture is
A. potassium chlorate b magnesium oxide c air d water
9, building a conservation-oriented society, "start from me", I think the following conservation behavior is reasonable.
A. direct irrigation of farmland with industrial wastewater; B. Pour the remaining drugs into the waste liquid tank.
C, eat spoiled rice cooked at high temperature D, water the flowers with Taomi water.
10, "Proud of advocating science and ashamed of ignorance". The following statement is unscientific.
A, the difference between hard water and soft water commonly used soapy water B, unopened cellar, the cellar is very good, don't enter rashly.
C. Iodized salt "iodine" refers to iodine element D. Children often bite pencils, which can lead to lead poisoning.
1 1. Human life and production are inseparable from metals. The following uses of metals are not determined by metal activity.
A. recovering silver from silver-containing waste liquid with iron B. reacting zinc with dilute sulfuric acid to generate hydrogen.
C. ancient gold and silver products can be preserved to this day. Making door and window frames with aluminum alloy.
12, the following laboratory gas design is feasible.
A. heating a mixture of potassium chlorate and a small amount of manganese dioxide to generate oxygen.
B, reacting hydrochloric acid with calcium oxide to prepare carbon dioxide.
C, reacting dilute sulfuric acid with limestone to prepare carbon dioxide.
D, reacting dilute sulfuric acid with copper to prepare hydrogen.
13, in the reaction of x+2o2co2+2h2o, according to the law of conservation of mass, it can be judged that the chemical formula of x is
A.D.CO
14. Invert the four test tubes containing the following four gases in water respectively, and the highest water level in the test tubes is ().
A, hydrogen b, nitrogen c, carbon dioxide d, oxygen
15, and the right figure shows the inclusion and non-inclusion relationship among pure substances, simple substances, compounds, oxygenated compounds and oxides. If the whole circle represents pure matter, which of the following options can correctly represent the material categories of ①, ②, ③ and ④?
A.① simple substance, ③ oxide B. ② compound, ④ oxide
C.① simple substance, ③ compound D. ② oxygenated compound, ④ oxide.
Second, multiple-choice questions (this question contains 5 small questions, each with 2 points, *** 10. Each question has one or two options that match the meaning of the question. If the correct answer contains only one option, when multiple choices are made, the topic is 0; If the correct answer contains two options, only one correct answer will be given to 1, and two correct answers will be given to 2, but as long as there is one mistake, a small question will be given to 0).
16. The following statement about molecules and atoms is incorrect ().
A. Molecules and atoms are in constant motion. B. Molecules and atoms are particles that make up matter.
C. atoms are the smallest particles that can't be subdivided. D. molecules are the only particles that maintain the chemical properties of substances.
17, the following explanation of some facts is incorrect.
Fact explanation
Charcoal combustion will produce carbon dioxide or carbon monoxide, and the products may be different according to the quality of reactants.
B Hydrogen peroxide can be sterilized, but water can't have two different molecules.
C the reaction rate between copper chloride and calcium hydroxide is faster than that between two solids, and the particles involved in the reaction have more chances to contact in solution than in solid.
When the mercury thermometer is heated, the mercury column rises and the volume of mercury atoms becomes larger.
18. Material R is an indispensable material in human life activities. It is known that the relative molecular mass of R is 150, in which the mass fraction of carbon is 40%, oxygen is 53.3%, and the rest is hydrogen. The chemical formula of R is ()
A.C 6h 12o 6 B . C6H6O C . C5 h 10o 2D . C5 h 10o 5
19, the following description of the experimental phenomenon is correct.
A. The iron wire burns in the air, and sparks are everywhere, producing black substances.
B, putting the red-hot charcoal into a container filled with oxygen, and violently burning to generate white light.
When paraffin is burned in oxygen, it will produce water and carbon dioxide.
D, red substance is generated on the surface of aluminum wire immersed in copper sulfate solution.
20. The following four pictures respectively correspond to the four operation processes, which are correct.
A B C D
A. A certain mass of magnesium is burned in a closed container.
B, simultaneously putting iron and magnesium with the same mass into two sufficient dilute hydrochloric acid with the same solute mass fraction.
C, adding excessive dilute hydrochloric acid into the partially deteriorated sodium hydroxide solution which is left in the air for a long time.
D, at a certain temperature, adding sodium chloride solid into a certain quality of saturated sodium chloride solution.
Three. (This question contains 5 small questions, ***28 points)
2 1.(4 points) The world is material, and material is composed of various chemical elements. Please write down the chemical formula of the following substances:
(1) The gas transported by the West-East Gas Transmission Project is:
(2) Mercury is not silver, but a common name for a metal.
(4) The oxide with the largest mass fraction of oxygen is.
22.(4 points) Answer the following questions:
According to statistics, the number of private cars in Nanchong is increasing by spurt: from 50,000 to 60,000, which took less than 12 months. Automobile exhaust (such as carbon monoxide, sulfur dioxide and nitric oxide) will aggravate the air pollution in our city, and its control methods are as follows:
(1) Install a "catalytic converter" on the automobile exhaust pipe. Its function is to make carbon monoxide react with nitric oxide to produce N2 and CO2. Write the chemical equation of the reaction _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _;
(2) Using compressed natural gas (CNG) as fuel, build a gas filling station. The chemical equation of compressed natural gas combustion is. Before lighting the gas, you should.
(3) Use hydrogen fuel. In 2005, Tongji University launched the "Beyond No.3" hydrogen-powered vehicle with hydrogen as fuel. The chemical equation of hydrogen combustion is _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.
23.(8 points) The picture on the right is a part of the periodic table of elements. In the periodic table of elements, the atomic numbers of elements in the same period (horizontally) increase from left to right in turn, except for group 0 elements (rightmost column), the atomic radius decreases gradually. In chemical reactions, the ability of atoms to lose electrons gradually weakens, and the ability to gain electrons gradually increases. Please answer: (1) The relative atomic mass of silicon is; The element with atomic number 8 is located in the first period of the periodic table of elements, and the element symbol is, belonging to (fill in "metal" or "nonmetal") elements.
(2) Atomic radius: sodium and magnesium (fill in ">" or "= =" or "
(3) Elements with similar chemical properties to sodium are.
(4) By analyzing the above table, we can find that the arrangement of each horizontal element from left to right follows a rule that
.
24.(6 points) Alloy A consists of four simple substances, which are known as follows: ① Alloy A does not contain K, Ca and Na; ② Gas B is combustible; ③ Gas G is one of the main products of human metabolism. Please answer the following questions according to the picture:
(1) What simple elements does alloy A consist of (expressed by chemical formula):,,;
(2) Write the chemical equation ① of the reaction:
(3) Write the chemical equation of reaction ②.
25.(6 points) A class of students did an experiment about the nature of acid in the laboratory. The reagents used are: ① iron filings ② iron oxide ③ hydrochloric acid ④ sodium hydroxide solution ⑤ sodium carbonate solution.
(1) At the end of the experiment, they poured all the waste liquid into the waste liquid tank. In order to discharge the waste liquid harmlessly, it is necessary to use _ _ _ _ _ _ _ to determine the pH value of the waste liquid.
(2) There may be _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _. There may be at most _ _ _ _ _ kinds of solutes in the waste liquid.
Iv. (This question contains 1 small question, ***7 points)
28.(7 points) A light yellow granular solid with active chemical properties can react with various substances under normal circumstances. For example, when it reacts with CO2, only Na2CO3 and O2 are generated, and when it reacts with dilute hydrochloric acid, only NaCl, H2O and O2 are generated. In class, the teacher did the following experiments:
A. Put a small amount of yellowish granular solid into a test tube containing a small amount of water, and a colorless and odorless gas can be observed;
B. Add a few drops of phenolphthalein test solution to the test tube, and you can observe that the solution in the beaker turns red.
According to the experimental phenomenon, answer the following questions:
(1) pale yellow granular solid must contain elements. The reason why you made this judgment is.
(2) The gas produced in Experiment A can be collected by this method.
(3) Students have different views on the gas composition produced in Experiment A, and put forward the following assumptions:
① the gas is co; ② The gas is H2.
Please guess that gas may also be (write chemical formula).
(4) Design an experiment to prove your speculation in (3) (write brief operation steps, reaction phenomena and conclusions).
operation sequence/order
Reaction phenomenon
conclusion
V. (This question contains 1 small question, ***5 points)
29.(5 points) Industrial ironmaking is to add raw materials such as iron ore and coke into the blast furnace, and introduce air at high temperature for a series of reactions to reduce iron.
(1) Introduce air to convert solid coke into gaseous substances with reducibility. The chemical reaction equation involved in the conversion process is.
(2) The chemical equation of hematite (mainly composed of Fe2O3) reacting in blast furnace to generate elemental iron is:
(3) Calculation of fruit juice: ① The relative molecular mass of iron oxide (Fe2O3) is:
② In 5000t hematite containing 84% iron oxide, the mass of iron oxide is t;
③ Theoretically, pig iron T containing 98% iron can be obtained from the above hematite.
Reference answers and grading standards of ninth grade chemistry examination questions
First, multiple-choice questions (this question contains 15 questions, each with 2 points and * * * 30 points).
The title is12345678 91012131415.
Answer a, d, d, d, d, d, d, d, c, b.
Second, multiple-choice questions (this question ***5 small questions, each small question 2 points, * *10 points) If the correct answer only contains one option, when multiple choices are made, the topic is 0 points; If the correct answer contains two options, only one correct answer 1 will be given, and two correct answers will be given 2 points, but as long as there is one mistake, the small question will be given 0 points.
Title16171819 20
Answer CD d d BD AC
Three. (This title is ***4 small questions, each grid 1 point, ***28 points)
2 1, (4 points) CH4, Hg, Ca(OH)2, H2O2
22.(4 points) (1)2CO+2 has no catalyst N2+2CO2.
(2) CH4+2O2 ignites H2O+2CO2 to verify the purity (3) 2H2+O2 ignites 2 H2O.
23.(8 points) (1)28.09 2 O nonmetal (2)