Evaporation leads to the cooling of a liquid. Which of the following statements correctly explains why this occurs?
The fastest-moving molecules escape from the surface of the liquid, reducing the average kinetic energy of the remaining molecules.
The slowest-moving molecules escape, leaving behind molecules with higher kinetic energy.
All molecules in the liquid have the same energy, but some absorb heat from the air to escape.
The liquid molecules react with the air and lose energy.
528 exam-style questions on CIE IGCSE Physics 2.2 Thermal properties and temperature, covering 2.2.1 Thermal expansion of solids, liquids and gases, 2.2.2a Internal energy and temperature, 2.2.2b Specific heat capacity, 2.2.3a Melting, boiling, condensation and solidification, 2.2.3b Evaporation, and 2.2.3c Cooling by evaporation. Each one has a worked solution and a mark scheme showing where the marks go.