Which of these physical changes would require the release of energy?

Question

Quizplus · Accepted Answer

When a gas is condensed into a liquid, the particles lose energy and come closer together, which releases energy into the surroundings in the form of heat. This process is exothermic and requires the release of energy. Boiling a liquid and melting a solid are endothermic processes that require energy input, and therefore do not release energy into the surroundings.

Which of These Physical Changes Would Require the Release of Energy