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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Solution

Both are chemical changes as they are irreversible and chemical composition gets changed.

The formation of water is a combination reaction.

$2 H_{2}$ + $O_{2}$ $\to$ $2 H_{2} O$

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

$2 H_{2} O$ $\to$ $2 H_{2}$ + $O_{2}$

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Combination Reaction

Standard X Chemistry

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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.

Both are chemical changes as they are irreversible and chemical composition gets changed. The formation of water is a combination reaction. 2H2 + O2 → 2H2O The electrolysis of water to give hydrogen and oxygen is a decomposition reaction. 2H2O → 2H2 + O2