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

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Presentation transcript:

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

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

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

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

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

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

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

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

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

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

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

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

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