MARIYA INTERNATIONAL SCHOOL. Work sheet I. Term I. Level 9 Chemistry [PAPER 1-MCQ] Name: ELECTRICITY AND CHEMISTRY

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1 MARIYA INTERNATIONAL SCHOOL Work sheet I Term I Level 9 Chemistry [PAPER 1-MCQ] Name: ELECTRICITY AND CHEMISTRY 1. The diagram shows how aluminium is manufactured by electrolysis. What are the anode and cathode made of? 2. A student sets up the apparatus shown. The bulb does not light.

2 After the student adds substance X to the water, the bulb lights. What is X? A) Calcium carbonate B) Carbon C) Copper (II) sulphate D) Ethanol 3. The bodies of aircraft are often made using aluminium. Which two properties of aluminium make it suitable for this purpose? 4. In the circuit shown the bulb does not light. Which change would cause the bulb to light? A) Add more solid copper (II) sulphate to the beaker B) Add water to dissolve the copper (II) sulphate C) Replace the carbon electrodes with copper electrodes D) Reverse the connections to the electrodes

3 5. The following electrolysis circuit is set up, using inert electrodes P, Q, R and S. At which of the electrodes is a Group VII element produced? A) P only B) P and R C )Q only D )Q and S 6. Which object is least likely to contain aluminium? A) A bicycle frame B) A hammer C) A saucepan D) An airplane body 7. At which stage in the manufacture of magnesium from sea-water can electrolysis be used? 8. Metallic and non-metallic elements can both be extracted by electrolysis. Which element is produced at the negative electrode (cathode)? A) Bromine B) Chlorine C) Hydrogen D) Oxygen

4 9. Which product is manufactured by electrolysis? A) Aluminium B) Copper (II) sulphate C) Sodium chloride D) Steel 10. The diagram shows that two gases are formed when concentrated hydrochloric acid is electrolyzed between inert electrodes. Which line correctly describes the colors of the gases at the electrodes? 11. The diagram shows an electrolysis experiment to electroplate nickel with a different metal.

5 Which nickel electrodes are plated with a metal? A) 1 only B) 1 and 3 only C) 2 only D) 2 and 4 only 12. A molten compound is electrolyzed. Two atoms of X are deposited at the negative electrode at the same time as three atoms of Y are deposited at the positive electrode. These results show that: X is a 1 ; Y is a 2 ; The formula of the compound is 3. How are gaps 1, 2 and 3 correctly completed? 13. In which electrolysis are chlorine, hydrogen and sodium hydroxide all produced?

6 14. Which apparatus could be used to electroplate an iron nail with copper? 15. Two elements X and Y form ionic compounds, XBr2 and Y2O3. The compounds are separately melted and electricity is passed through the liquids. What are the products at the cathodes? A) Bromine and oxygen B) Bromine and Y C) Oxygen and X D) X and Y 16. Which change can take place during electrolysis? A) Lead (IV) oxide Lead (II) oxide + oxygen B) Concentrated hydrochloric acid hydrogen + chlorine C) Sodium hydroxide + nitric acid sodium nitrate + water D) Lead (II) nitrate + Sulfuric acid Lead (II) sulfate + nitric acid

7 17. Aluminium is extracted from its oxide by electrolysis. The oxide is dissolved in 1 cryolite and aluminium is deposited at the 2 Which words correctly complete gaps 1 and 2? 18. Molten Lead (II) bromide is electrolyzed as shown. 19. Which of these elements could be formed at the anode when a molten salt is electrolyzed? A) Copper B) Iodine C) Lithium D) Strontium 20. The diagram shows apparatus for plating a spoon with silver.

8 Which statement is not correct? A) Silver would stick to the spoon because it is a very reactive metal. B) The electrolyte would be a silver salt dissolved in water. C) The metal electrode would be made from silver. D) The spoon would be connected to the negative of the power supply. 21. Aqueous Copper (II) sulfate solution is electrolyzed using inert electrodes. Copper (II) ions (Cu 2+ ), hydrogen ions (H + ), hydroxide ions (OH ) and sulfate ions (SO4 2- ) are present in the solution. To which electrodes are the ions attracted during this electrolysis? 22. Three electrolysis cells are set up. Each cell has inert electrodes. The electrolytes are listed below. Cell 1 aqueous sodium chloride Cell 2 concentrated hydrochloric acid Cell 3 molten lead (II) bromide In which cells is a gas formed at both electrodes? A) 1 and 2 B) 1 and 3 C) 2 only D) 3 only 23. Which products are formed at the anode and cathode when electricity is passed through molten lead (II) bromide?

9 24. Winston Churchill, a British Prime Minister, had his false teeth electroplated with gold. The teeth were coated with a thin layer of carbon and were then placed in the apparatus shown. Which row is correct? 25. The diagram shows an electrolysis circuit. At which electrode is hydrogen formed?

10 26. The diagram shows a failed attempt to copper-plate a pan. Which action will plate the pan with copper? A) Cooling the copper sulfate solution in an ice bath B) Heating the copper sulfate solution to boiling point C) Increasing the voltage from 3 v to 6 v D) Making the pan the cathode and the copper the anode 27. Copper and hydrogen can each be formed by electrolysis. At which electrodes are these elements formed?

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