$$H_2O_2(aq) \rightarrow H_2O(l) + O_2(g)$$

In this equation, \(H_2O_2\) is the reactant, and \(H_2O\) and \(O_2\) are the products. Reactants are the substances that are present at the beginning of a chemical reaction, while products are the substances that are formed at the end of a chemical reaction. Therefore, \(H_2O_2\) is a reactant in this chemical equation.