a. Reactant = a substance that enters into and is altered in the course of a chemical reaction.
b. Product = the substances produced at the end of the reaction are known as the products.
c. Chemical reaction rate = the speed at which a chemical reaction proceeds.
d. Activation energy = the minimum amount of energy that is required to activate atoms or molecules.
e. Chemical equation = a representation of a chemical reaction using symbols of the elements to indicate the amount of substance.
