Here's the breakdown of the reactants and products in the reaction:

Reactant:

* Hydrogen peroxide (H₂O₂) is the reactant in this reaction.

Product:

* Water (H₂O) is the product of this reaction.

Explanation:

This chemical equation represents the decomposition of hydrogen peroxide. Two molecules of hydrogen peroxide (H₂O₂) break down into two molecules of water (H₂O) and one molecule of oxygen gas (O₂). This is a common example of a decomposition reaction.