A porous clay pot filled with water is used to keep the water cool in hot weather. Some water seeps through the clay to the outer surface of the pot and evaporates.
Which molecules escape from the water during evaporation, and what happens to the average speed of the water molecules that remain on the surface?
the more energetic ones | decreases
the more energetic ones | increases
the less energetic ones | decreases
the less energetic ones | increases
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.