Liquid nitrogen at its boiling point turns into nitrogen gas at the same temperature. How does the internal energy of the nitrogen change?
It stays the same, because the temperature of the nitrogen does not change
It increases, because the kinetic energy store of the particles increases
It increases, because the potential energy store of the particles increases
It decreases, because energy is used up in separating the nitrogen particles
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.