Describe the arrangement of molecules and the spacing between molecules in a solid.
Describe the arrangement of molecules and the spacing between molecules in a gas.
State the name of the physical process by which a liquid changes into a solid.
State the name of the physical process by which a liquid changes into a gas at a temperature below its boiling point.
A student uses a microscope to observe pollen grains suspended in water.
State the name given to the random, continuous movement of the pollen grains.
Describe the path of a single pollen grain as viewed through the microscope.
The temperature of the water is increased. Describe any changes in the movement of the pollen grains.
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.