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
313 exam-style questions on CIE IGCSE Physics 2.2.3a Melting, boiling, condensation and solidification. Each one has a worked solution and a mark scheme showing where the marks go.