A sample of liquid paraffin wax is solidifying at its freezing point in a laboratory. Next to it, a beaker of pure liquid ethanol is boiling on a hot plate.
What is happening to the temperature of the solidifying wax and the temperature of the boiling ethanol during these phase changes?
The temperature of the solidifying wax is constant, and the temperature of the boiling ethanol is constant.
The temperature of the solidifying wax is decreasing, and the temperature of the boiling ethanol is constant.
The temperature of the solidifying wax is constant, and the temperature of the boiling ethanol is increasing.
The temperature of the solidifying wax is decreasing, and the temperature of the boiling ethanol is increasing.
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.