A beaker containing liquid water is placed in a freezer set at −15∘C-15^\circ\text{C}−15∘C. The water is currently in the process of freezing into ice at 0∘C0^\circ\text{C}0∘C. At the same time, a flask of liquid ethanol is being heated on a hot plate and is currently boiling at 78∘C78^\circ\text{C}78∘C.
What is happening to the temperature of the freezing water and the temperature of the boiling ethanol?
Temperature of freezing water: constant; Temperature of boiling ethanol: constant
Temperature of freezing water: decreasing; Temperature of boiling ethanol: constant
Temperature of freezing water: constant; Temperature of boiling ethanol: increasing
Temperature of freezing water: decreasing; Temperature of boiling ethanol: 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.