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

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Decomposition reactions are those in which a compound breaks down to form two or more substances. These reactions require a source of energy to proceed. Thus, they are the exact opposite of combination reactions in which two or more substances combine to give a new substance with the release of energy.

Decomposition Reaction: 

Combination Reaction:
CaO (s) + H2O (l) → Ca(OH)2 (aq)

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