Which statement best describes the difference between endothermic and exothermic reactions?

Question

They are opposites because endothermic reactions require energy and exothermic reactions release energy.
They are opposites because endothermic reactions release energy and exothermic reactions require energy.
They the same because they are both ways of forming precipitates.
They the same because they are both ways of forming gasses.

Answer 1

The statement that best describes the difference between endothermic and exothermic reactions is:

They are opposites because endothermic reactions require energy and exothermic reactions release energy.