A sealed syringe contains a fixed mass of gas. The plunger is pushed in until the gas fills half the volume it filled before. What happens to the density of the gas?
It stays the same because the mass of the gas has not changed
It doubles because the same mass now fills half the volume
It halves because the volume of the gas has been halved
It doubles because the gas particles have been squashed smaller
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.