If two substances are chemically combined and there is a release of

energy, the reaction is described as

a. exothermic.

b. analytic.

c. endothermic.

d. catalytic.

a. Exothermic.

Explanation:

We know that there are several types of chemical reactions. In some reactions, the energy which is absorbed to break down the bonds of the reactants becomes less than the energy which is released at the time of forming new bonds of the products.

This means that in the whole reaction, energy is released as either light or light. This type of reaction is called an exothermic reaction.