When a liquid evaporates, the temperature of the remaining liquid changes. Which of the following correctly describes this temperature change and its molecular explanation?
Temperature change: decreases. Explanation: the most energetic molecules escape, leaving behind molecules with lower average kinetic energy.
Temperature change: decreases. Explanation: the least energetic molecules escape, leaving behind molecules with lower average kinetic energy.
Temperature change: increases. Explanation: the most energetic molecules escape, leaving behind molecules with higher average kinetic energy.
Temperature change: increases. Explanation: the least energetic molecules escape, leaving behind molecules with higher average kinetic 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.