During the evaporation of a liquid, some molecules escape from its surface.
Which row in the table correctly describes which molecules escape and the resulting change in the average kinetic energy of the remaining molecules?
| Molecules that escape | Average kinetic energy of remaining molecules | |
|---|---|---|
| A | the most energetic molecules | decreases |
| B | the most energetic molecules | increases |
| C | the least energetic molecules | decreases |
| D | the least energetic molecules | increases |
Row A
Row B
Row C
Row D
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.