Which one of the following processes is endothermic? A) Boiling a liquid. B) Freezing a solid. C) Condensation of a gas into a liquid. D) Condensation of a gas into a solid.

D) Condensation of a gas into a solid.

Explanation:

An endothermic process is a process that absorbs heat from the surroundings.

A) Boiling a liquid.

This gives off heat to the surroundings. An exothermic process.

B) Freezing a solid.

In this process, the water releases heat to the surroundings, so it is an exothermic process

C) Condensation of a gas into a liquid.

As water vapor condenses into liquid, it loses energy in the form of heat. Therefore, this process is exothermic.

D) Condensation of a gas into a solid.

This process absorbs heat from the surrounding, hence it is an endothermic proccess.