MARIYA INTERNATIONAL SCHOOL Work sheet III Term I Level 8 Chemistry [MCQ] Name: CHEMICAL REACTIONS & SULFUR 1. A steel works and a chemical works are built near to a city. The limestone buildings in the city begin to crumble. Which gas is most likely to cause this damage? A. Carbon dioxide B. Carbon monoxide C. Oxygen D. Sulfur dioxide 2. Which statements are correct? I. Carbon monoxide is responsible for the production of acid rain. II. Oxides of nitrogen are present in car exhausts. III. Sulfur dioxide can be produced by the combustion of fossil fuels. A. 1 and 2 only B. 1 and 3 only C. 2 and 3 only D. 1, 2 and 3 3. Which compound in polluted air can damage stonework and kill trees? A. carbon dioxide B. carbon monoxide C. lead compounds D. sulfur dioxide. 4. Coal is a fossil fuel. Which gas is not formed when coal burns? A. carbon dioxide B. carbon monoxide C. methane D. sulfur dioxide
5. A liquid X reacts with solid Y to form a gas. Which two diagrams show suitable methods for investigating the rate (speed) of the reaction? A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4 6. Which row describes how the energy of collision between particles changes when concentration and temperature are increased? 7. The Contact process is used for the manufacture of sulfuric acid. Which statement about this process is not correct? A A catalyst of iron is used. B Oxygen from the air is used to react with sulfur dioxide. C Sulfur trioxide dissolves in sulfuric acid to form oleum. D The temperature used is around 450 C.
8. The rate of reaction between magnesium and excess dilute hydrochloric acid was followed by measuring the mass of magnesium present at regular time intervals. Two experiments were performed. Both experiments used 0.1 g of magnesium ribbon. The acid in experiment 1 was less concentrated than in experiment 2. Which graph shows the results of the experiments? 9. Which statement explains why coal dust forms an explosive mixture with air? A Coal dust catalyses the explosion. B Coal dust has a large surface area. C Crushing coal increases the concentration of the coal. D Crushing coal increases the temperature of the coal. 10. Sulfuric acid is manufactured by the Contact process. The most important reaction takes place in the presence of a catalyst. What are the reactants and the catalyst for this reaction?
11. Copper(II) carbonate reacts with dilute sulfuric acid. The rate of the reaction can be changed by varying the conditions. Which changes always increase the rate of this chemical reaction? 1 increasing the concentration of sulfuric acid 2 increasing the size of the pieces of copper (II) carbonate 3 increasing the temperature 4 increasing the volume of sulfuric acid A 1, 3 and 4 B 1 and 3 only C 2 and 3 D 3 and 4 only 12. Which reaction is not affected by the presence of light? A a candle burning B methane reacting with chlorine C photosynthesis D silver bromide decomposing to form silver 13. Which statement about catalysts in chemical reactions is not correct? A Catalysts are not used up in the reaction. B Catalysts increase the energy of the reacting particles. C Catalysts increase the rate of the reaction. D Catalysts lower the activation energy. 14. Nitrogen monoxide is produced in a car engine when petrol is burnt. The gases from the car engine are passed through a catalytic converter. In the catalytic converter the nitrogen monoxide reacts with carbon monoxide to form nitrogen and carbon dioxide. Which statement is not correct? A Carbon monoxide is oxidized in the catalytic converter. B Carbon monoxide is produced by the complete combustion of petrol. C Nitrogen monoxide is formed by the reaction of nitrogen and oxygen. D Nitrogen monoxide is reduced in the catalytic converter.
15. What is a property of concentrated sulfuric acid but not of dilute sulfuric acid? A It is a dehydrating agent. B It neutralizes alkalis. C It produces a white precipitate with barium nitrate. D It reacts with metals to give a salt and hydrogen. 16. When sulfur is heated it undergoes a...1... change as it melts. Further heating causes the sulfur to undergo a...2... change and form sulfur dioxide. Which words complete gaps 1 and 2? 17. A student was investigating the reaction between marble chips and dilute hydrochloric acid. Which changes slow down the rate of reaction?
18. Which statement about sulfuric acid is correct? A It is made by the Haber process. B It is made in the atmosphere by the action of lightning. C It reacts with ammonia to produce a fertilizer. D It reacts with copper metal to produce hydrogen gas. 19. Ethanoic acid reacts slowly with calcium carbonate. Which statements explain why an increase in temperature increases the rate of the reaction? 1 The activation energy of the reaction is decreased. 2 There is an increase in collision rate. 3 The particles have more energy. 4 There will be fewer successful collisions. A 1 and 2 B 1 and 3 C 2 and 3 D 2 and 4 20. Which row shows the conditions used in the manufacture of sulfuric acid by the Contact process?