Humber Admissions Practice Test

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What is the result of a decomposition reaction?

  1. Formation of a single new substance

  2. Production of two or more simpler substances

  3. Replacement of one chemical by another

  4. Combination of elements into a compound

The correct answer is: Production of two or more simpler substances

A decomposition reaction involves breaking down a compound into simpler substances, which is exactly what option B states: the production of two or more simpler substances. In these types of reactions, a single reactant is transformed into multiple products, often resulting in elemental forms or smaller compounds. For example, when water (H₂O) is subjected to electrolysis, it decomposes into hydrogen (H₂) and oxygen (O₂) gases. This clearly illustrates the key characteristic of decomposition reactions—one complex structure yielding multiple simpler products. Understanding this fundamental aspect of chemical reactions is crucial as it lays the groundwork for more complex chemical concepts and reactions.

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