A spilled beaker of ethanol is left on a laboratory bench and begins to evaporate. Which row in the table correctly describes the molecules that are the first to escape into the gas phase, and the change in the average kinetic energy of the remaining molecules?
| Molecules that escape first | Average kinetic energy of remaining molecules | |
|---|---|---|
| A | highest kinetic energy | decreases |
| B | highest kinetic energy | increases |
| C | lowest kinetic energy | decreases |
| D | lowest kinetic energy | 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.