A beaker of crushed ice at −10 ∘C-10\ {}^\circ\text{C}−10 ∘C is heated steadily.
The temperature of the ice rises to 0 ∘C0\ {}^\circ\text{C}0 ∘C. It then stays at 0 ∘C0\ {}^\circ\text{C}0 ∘C for several minutes.
Why does the temperature stay at 0 ∘C0\ {}^\circ\text{C}0 ∘C?
No energy is transferred to the ice during this time
The ice loses energy to the air as fast as it gains it
The particles in the ice stop moving until it has all melted
The energy transferred changes the state, not the temperature
44 exam-style questions on OCR GCSE Physics 1.2 Changes of state, covering 1.2.1 Conservation of mass during changes of state, 1.2.2 Physical and chemical changes, 1.2.3 Heating, temperature and changes of state, 1.2.4 Specific heat capacity and specific latent heat, 1.2.5 Internal energy and temperature change, and 1.2.6 Energy transfer during a change of state. Each one has a worked solution and a mark scheme showing where the marks go.