which statement best describes the difference between endothermic and exothermic reactions?\nthey are…

which statement best describes the difference between endothermic and exothermic reactions?\nthey are opposites because endothermic reactions require energy and exothermic reactions release energy.\nthey are opposites because endothermic reactions release energy and exothermic reactions require energy.\nthey the same because they are both ways of forming precipitates.\nthey the same because they are both ways of forming gasses.

which statement best describes the difference between endothermic and exothermic reactions?\nthey are opposites because endothermic reactions require energy and exothermic reactions release energy.\nthey are opposites because endothermic reactions release energy and exothermic reactions require energy.\nthey the same because they are both ways of forming precipitates.\nthey the same because they are both ways of forming gasses.

Answer

Brief Explanations:

Endothermic reactions absorb energy from the surroundings, while exothermic reactions release energy to the surroundings. This makes them opposites. Precipitate - formation and gas - formation are not related to the endothermic - exothermic distinction.

Answer:

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