How do endothermic reactions differ from exothermic reactions?

• A. Both release energy
• B. Endothermic reactions release energy; exothermic absorb it
• C. Endothermic absorb energy; exothermic release it
• D. There is no difference

Answer: (C)

Endothermic and exothermic reactions are distinct in terms of their energy exchange with the surroundings. Endothermic reactions are characterized by the absorption of energy, typically in the form of heat, from the environment. This absorption of energy is necessary for the reaction to occur, resulting in a decrease in temperature of the surroundings.

On the other hand, exothermic reactions release energy, also usually in the form of heat, into the surroundings. This release increases the temperature of the environment around the reaction.

Thus, understanding these definitions clarifies that endothermic reactions fundamentally differ from exothermic reactions in terms of energy direction: absorption versus release, respectively. The correct answer effectively summarizes this distinction.