In a decomposition reaction, a compound breaks down into what?

• A. Single product
• B. Simpler substances or elements
• C. A mixture of compounds
• D. A complex compound

Answer: (B)

A decomposition reaction is when a compound breaks down into simpler substances or elements. This happens because the bonds holding the compound together are broken, usually requiring energy such as heat, electricity, or light. The products are typically smaller or less complex than the original substance. For example, calcium carbonate can break down into calcium oxide and carbon dioxide, and hydrogen peroxide decomposes into water and oxygen. So, the description that it yields simpler substances or elements best fits what occurs in a decomposition reaction. It wouldn’t usually produce just a single product, a random mixture of compounds, or a more complex compound.