A block of wax is heated steadily. For four minutes the temperature of the wax does not change. What can be concluded about the wax during those four minutes?
The wax is not changing state and its internal energy is increasing
The wax is not changing state and its internal energy is staying the same
The wax is changing state and its internal energy is increasing
The wax is changing state and its internal energy is staying the same
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.