A puddle of water gradually evaporates on a warm day. Which statement correctly describes what happens to the molecules of the water during this process?
The least energetic molecules escape from the surface, increasing the average kinetic energy of the remaining molecules.
The least energetic molecules escape from the surface, decreasing the average kinetic energy of the remaining molecules.
The most energetic molecules escape from the surface, increasing the average kinetic energy of the remaining molecules.
The most energetic molecules escape from the surface, decreasing the average kinetic energy of the remaining molecules.
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.