A student pours 0.30 kg of water at 80 ∘C80\ {}^\circ\text{C}80 ∘C into 0.10 kg of water at 20 ∘C20\ {}^\circ\text{C}20 ∘C.
Assume that no energy is transferred to the surroundings or to the container.
What is the final temperature of the mixture?
35 ∘C35\ {}^\circ\text{C}35 ∘C
50 ∘C50\ {}^\circ\text{C}50 ∘C
60 ∘C60\ {}^\circ\text{C}60 ∘C
65 ∘C65\ {}^\circ\text{C}65 ∘C
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.