A sample of substance Y is heated from a solid state until it becomes a gas. The graph below shows how the temperature of substance Y varies with time.
Which part of the graph (P, Q, R, or S) shows when substance Y is boiling?
What happens to the kinetic energy of the particles as the temperature of substance Y increases during section R?
Calculate the thermal energy needed to vaporize 0.450 kg0.450\text{ kg}0.450 kg of substance Y at its boiling point.
The specific latent heat of vaporization of substance Y is 315,000 J/kg315,000\text{ J/kg}315,000 J/kg.
Use the equation: thermal energy=mass×specific latent heat\text{thermal energy} = \text{mass} \times \text{specific latent heat}thermal energy=mass×specific latent heat
Internal energy and energy transfers Questions
Practise AQA GCSE Physics Internal energy and energy transfers with exam-style questions for Foundation and Higher tier. 48 questions covering Internal energy, Temperature changes in a system and specific heat capacity, and Changes of state and specific latent heat, matched to the AQA GCSE Physics (8463) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.