A candle is lit. Solid wax near the flame becomes liquid wax. Some of the wax burns in the flame.
Name the change of state that takes place when the solid wax becomes liquid wax.
The liquid wax runs down the candle, cools and becomes solid wax again. Explain why this melting and cooling is a physical change and not a chemical change.
The total mass of the candle falls as the candle burns. Explain why the mass of the wax does not fall when the wax melts.
Name the change of state that takes place when the liquid wax becomes solid wax.
40 exam-style questions on AQA GCSE Physics 3.1 Changes of state and the particle model, covering 3.1.1 Density of materials and 3.1.2 Changes of state. Each one has a worked solution and a mark scheme showing where the marks go.