Reactants and reagents are the substances that are used to bring about the chemical reaction. A reactant is any substance that is consumed or used up during the reaction. The substance that is produced by a chemical reaction is called the product.

What is a reactant simple definition?

Definition of reactant : a substance that enters into and is altered in the course of a chemical reaction.

What is a reactant in a reaction?

The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.