Practise AQA GCSE Physics 3.1 Changes of state and the particle model with exam-style questions for Foundation and Higher tier. 22 questions covering 3.1.1 Density of materials and 3.1.2 Changes of state, 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.