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

Combination reaction is a reaction in which two or more substances combine together to form a single substance.
$$A+B \rightarrow AB$$

Decomposition reaction is a reaction in which a compound splits into two or more simpler substances (elements or compounds).
$$AB \rightarrow C+D+.....$$
This is why Decomposition Reaction is called opposite of Combination Reaction.
$$CaCO_{3} (S) \rightarrow CaO (s) + CO_{2}(g)$$
This is a Decomposition reaction $$H_{2}(g) + Cl_{2} \rightarrow 2HCl (g)$$
This is a Combination reaction