Water at 20 ∘C20\ ^\circ\text{C}20 ∘C is heated until it reaches 100 ∘C100\ ^\circ\text{C}100 ∘C. It is then heated further until all of it has boiled away. Which statement about the two stages is correct?
The internal energy increases in both stages and the temperature rises in both
The internal energy rises in the second stage only and the temperature in both
The internal energy rises in the first stage only and the temperature in the first
The internal energy increases in both stages but the temperature rises in the first
40 exam-style questions on AQA GCSE Physics 3.2 Internal energy and energy transfers, covering 3.2.1 Internal energy, 3.2.2 Temperature changes in a system and specific heat capacity, and 3.2.3 Changes of state and specific latent heat. Each one has a worked solution and a mark scheme showing where the marks go.