A substance changes from a solid into a liquid. Its particles remain close together, but the liquid occupies a larger volume. Which pair of changes occurs?
The particles move past one another and the density decreases.
The particles move past one another and the density increases.
The particles stay at fixed positions and the density decreases.
The particles stay at fixed positions and the density increases.
87 exam-style questions on Edexcel GCSE Physics 14.1 Density and states of matter, covering 14.1.1 Kinetic theory and states of matter, 14.1.2 Density, and 14.1.3 Density and changes of state. Each one has a worked solution and a mark scheme showing where the marks go.