An experiment is set up to observe the motion of tiny pollen grains suspended in water under a microscope.
Describe the appearance of the path shown by a single pollen grain.
Explain what causes this motion in terms of water molecules.
The water is heated to a higher temperature. Explain how this changes the motion of the pollen grains.
321 exam-style questions on CIE IGCSE Physics 2.1 Kinetic particle model of matter, covering 2.1.1 States of matter and changes of state, 2.1.2a Particle structure and motion in solids, liquids and gases, 2.1.2b Gas pressure and particle collisions, 2.1.2c Brownian motion, 2.1.3a The absolute scale of temperature, and 2.1.3b Pressure, volume and temperature of a gas. Each one has a worked solution and a mark scheme showing where the marks go.