Describe the arrangement, separation and motion of liquid molecules.
The motion of tiny pollen grains suspended in water can be observed under a microscope.
Describe the path taken by a single pollen grain.
State the term used to describe this movement.
Explain, in terms of molecules, what causes this movement.
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.