Question 11:
Why are decomposition reactions called the opposite of combination reactions?
Write equations for these reactions.
Answer
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: AB + Energy → A + B
Combination reaction: A + B → AB + Energy
2H2(g) + O2(g) → 2H2O(l) + Energy
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