Question

The substance(s) or molecules at the beginning of a chemical reaction is called a

chemical equation

product

reactant

Answer 1

Reactant or you can look it up hope this helps

Answer 2

Reactant.

A chemical reaction is the process in which atoms present in the starting substances rearrange to give new chemical combinations present in the substances formed by the reaction. These starting substances of a chemical reaction are called the reactants, and the new substances that result are called the products.