1. Electrolysis
Decide on the answer(s) then click and a rectangle will surround the correct answer(s).

2. Electrolysis Electrolysis involves splitting up a substance using…
1. Electricity.
2. Heat.
AQA Science © Nelson Thornes Ltd 2006  2

3. Electrolysis Ionic substances may be electrolysed when they are ...
1. Molten.
2. In solution.
AQA Science © Nelson Thornes Ltd 2006  3

4. Electrolysis
In electrolysis, positive ions move to the negative electrode, called the …
1. Cathode.
2. Anode.
AQA Science © Nelson Thornes Ltd 2006  4

5. At the electrodes
At the electrodes, negative ions lose their extra electrons and are …
1. Oxidised.
2. Reduced.
AQA Science © Nelson Thornes Ltd 2006  5

6. At the electrodes
Reactions where reduction and oxidation happen are called …
1. Electrolysis reactions.
2. Redox reactions.
AQA Science © Nelson Thornes Ltd 2006  6

7. At the electrodes
When electrolysis happens in water, the element usually produced at an electrode is …
1. The least reactive.
2. The most reactive.
AQA Science © Nelson Thornes Ltd 2006  7

8. The products from the electrolysis of brine
When we electrolyse brine, we get three products – chlorine gas, hydrogen gas and …
1. Sodium hydroxide solution.
2. Sodium hydroxide gas.
AQA Science © Nelson Thornes Ltd 2006  8

9. The products from the electrolysis of brine
Chlorine is used to…
1. Kill microbes in water.
2. Make hydrochloric acid.
3. Make disinfectants.
4. Make bleach.
AQA Science © Nelson Thornes Ltd 2006  9

10. The products from the electrolysis of brine
Hydrogen is used to…
1. Make plastic.
2. Make margarine.
3. Make hydrochloric acid.
AQA Science © Nelson Thornes Ltd 2006  10

11. The products from the electrolysis of brine
Sodium hydroxide is used to make…
1. Bleach.
2. Paper.
3. Soap.
AQA Science © Nelson Thornes Ltd 2006  11

12. Purifying copper
Copper extracted from its ore contains impurities such as…
1. Gold and silver.
2. Steel and carbon.
AQA Science © Nelson Thornes Ltd 2006  12

13. Purifying copper Copper is purified to remove these impurities by…
1. Electrolysis.
2. Electroplating.
AQA Science © Nelson Thornes Ltd 2006  13