A gas sample is cooled in a sealed container until it has all become a liquid.
Which statement correctly describes and explains the change in density?
The particles shrink as they lose energy, so the same mass takes up a smaller volume and the density increases.
The particles move much closer together, so the same mass takes up a smaller volume and the density increases.
The particles slow down but stay the same distance apart, so the volume and the density do not change.
The particles become heavier as they cool, so the mass of the sample increases 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.