A solid sample of material Y is heated until it flows into a mould. It is then cooled until it holds the shape of the mould. Analysis shows that the solid taken out of the mould is still pure Y.
Use the particle model to explain whether heating and cooling Y in this way is a physical change or a chemical change.
93 exam-style questions on OCR GCSE Chemistry 1.1 The particle model, covering 1.1.1 The particle model and changes of state and 1.1.2 Limitations of the particle model. Each one has a worked solution and a mark scheme showing where the marks go.