Question

which statement best describes the difference between endothermic and exothermic reactions?
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.

Explanation:

• Endothermic reactions absorb energy (require energy input).
• Exothermic reactions release energy.
• Precipitate formation and gas formation are not the key differences between endothermic and exothermic reactions.

Answer:

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