The molecules of a gas move further apart and their average speed decreases. What is happening to the gas?
The gas is being heated and compressed.
The gas is being cooled and is expanding.
The gas is being cooled and compressed.
The gas is being heated and is expanding.
151 exam-style questions on CIE IGCSE Physics 2.1.2a Particle structure and motion in solids, liquids and gases. Each one has a worked solution and a mark scheme showing where the marks go.