Question

which clue can be used to identify a chemical reaction as a decomposition reaction?
the reaction involves oxygen
the reaction involves ions
the reaction has a single reactant
the reaction has a single product

Explanation:

A decomposition reaction is defined as a reaction where a single reactant breaks down into two or more products. Let's analyze each option:

• "The reaction involves oxygen": Reactions with oxygen are typically combustion reactions, not decomposition.
• "The reaction involves ions": Ionic reactions can be of various types (like double - displacement) and not specific to decomposition.
• "The reaction has a single reactant": This matches the definition of a decomposition reaction, as a single compound (reactant) breaks down.
• "The reaction has a single product": A reaction with a single product is a synthesis (combination) reaction, not decomposition.

Answer:

The reaction has a single reactant