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Question

Why are decomposition reactions called the opposite of combination reactions? Explain by giving one example (with equation) of each type of reaction.

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Solution

Decompositon reaction are those in which a compound breaks down to form two or more substances. These reaction 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: 2H2Oelectrolysis2H2+O2
Combination reaction: 2H2+O22H2O+energy

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