When electricity is passed through tap water and gases are produced at the electrodes.
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When hydrogen in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical changes involved in the two cases.
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2H2 + O2 → 2H2O
The electrolysis of water to give hydrogen and oxygen is a decomposition reaction.
2H2O → 2H2 + O2
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