A pure liquid substance is cooled slowly. Its temperature is recorded from the moment it starts to freeze until it is completely frozen. Which statement is correct?
The temperature stays the same as the substance freezes.
The temperature decreases steadily as the substance freezes.
The temperature increases slightly as the substance freezes.
The temperature fluctuates as the substance freezes.
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.