Question

what must occur in order for a chemical reaction to be specifically classified as endothermic instead of exothermic? atoms are rearranged. chemical bonds are formed. energy is released in the form of heat. energy is absorbed in the form of heat.

Explanation:

Endothermic reactions absorb heat energy from the surroundings. In contrast, exothermic reactions release heat. Atom - rearrangement and bond - formation occur in both types of reactions.

Answer:

Energy is absorbed in the form of heat.