Which description matches a decomposition reaction?

Which description matches a decomposition reaction?

• A. Two elements swap places in compounds
• B. An acid and base neutralize
• C. A compound breaks into simpler products
• D. A hydrocarbon combusts with oxygen

Answer: (C)

Breaking down a substance into smaller, simpler substances is what a decomposition reaction is. It usually needs energy input to break the bonds in one compound, producing two or more products that are simpler than the starting material. The description that matches this is a compound breaking into simpler products. The other scenarios describe different reaction types: swapping parts between two compounds is a displacement-type process, neutralization forms salt and water, and combustion with oxygen is an oxidation-reduction process that releases energy and yields carbon dioxide and water. So the correct description is the one where a single compound breaks apart into simpler substances.

Breaking down a substance into smaller, simpler substances is what a decomposition reaction is. It usually needs energy input to break the bonds in one compound, producing two or more products that are simpler than the starting material. The description that matches this is a compound breaking into simpler products. The other scenarios describe different reaction types: swapping parts between two compounds is a displacement-type process, neutralization forms salt and water, and combustion with oxygen is an oxidation-reduction process that releases energy and yields carbon dioxide and water. So the correct description is the one where a single compound breaks apart into simpler substances.