When hydrogen burns in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical change involved in the two cases.

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Solution

When Hydrogen burns in Oxygen, water is formed from the combination of Hydrogen and water, this type of reaction is called a combination reaction.
$\underset{Hydrogen}{H_{2} (g)} + \underset{Oxygen}{O_{2} (g)} ⟶ \underset{Water}{H_{2} O (liq)} $

When electricity is passed through water, hydrogen, and oxygen gases are given out, the chemical changes involved here are decomposition and the type of reaction is a decomposition reaction.
$H_{2} O (liq) \overset{Electric current}{\to} H_{2} (g) + O_{2} (g) $
Hence, the answer will be a combination reaction and decomposition reaction.

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