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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.

For Example:
Decomposition Reaction:

\(CaCO_{3(s)}\rightarrow CaO_{(s)}+CO_{2(g)}\)

Combination Reaction:
\(CaO _{(s)} + H_2O _{(l)} → Ca(OH)_{2 (aq)}\)

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