Question

Which of these indicates that a liquid has transferred thermal energy to the air?

The liquid increases in temperature, and its particles lose kinetic energy.
The liquid decreases in temperature, and its particles gain kinetic energy.
The liquid increases in temperature, and its particles gain kinetic energy.
The liquid decreases in temperature, and its particles lose kinetic energy.

Answer 1

The liquid decreases in temperature and its particles lose KE.
Temperature is proportional to KE, so if temp. decreases, KE decreases.
Energy has been removed from the liquid, since it is now 'in the air'.