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Question

Question 11

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

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Solution

Decomposition reactions are those in which a compound breaks down to form two or more elements or new compounds.

These reactions require a source of energy (heat, light or electrical) to proceed. Thus, they are called the exact opposite of combination reactions, in which two or more reactants combine to give a new product with the release of energy.

For example:
Decomposition reaction: CaCO3(s)HeatCaO (s)+CO2(g)
Combination reaction: CaO(s)+H2O(l)Ca(OH)2(aq)

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