When electricity is passed through water it changes into oxygen and hydrogen who invented this

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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$2H_2$ + $O_2$ $\to$ $2H_{2}O$

The electrolysis of water to give hydrogen and oxygen is a decomposition reaction.

$2H_{2}O$ $\to$ $2H_2$ + $O_2$