Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.

Answers (1)

In decomposition reactions, we can observe that a single reactant breaks down to give simpler products. This reaction source of energy. Whereas, in combination reaction two or more substances combine to give a product and energy is released in this reaction.

Hence, decomposition reactions called the opposite of combination reactions.

Example : 

decomposition reaction : 2H_2O(l)
ightarrow 2H_2(g)+O_2(g)

and  combination reaction : 2H_2(g)+O_2(g)
ightarrow 2H_2O(l)+Energy

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