Which of the following chemical or physical changes is an endothermic process?
A) the mixing of sulfuric acid and water
B) the freezing of water
C) the evaporation of water
D) the combustion of gasoline
E) none of these

Question

Quizplus · Accepted Answer

The evaporation of water is an endothermic process because it requires energy input (in the form of heat) to break the hydrogen bonds between water molecules and convert liquid water into water vapor. The mixing of sulfuric acid and water (A) is exothermic because heat is released. The freezing of water (B) and combustion of gasoline (D) are also exothermic because they release heat.

Which of the Following Chemical or Physical Changes Is an Endothermic