Water in a beaker is heated until it boils and turns into steam (gas).
Describe what happens to the arrangement, separation, and motion of the water molecules as the water changes from liquid to gas.
When the steam touches a cold metal plate, drops of liquid water form on its surface.
Explain what happens to the steam molecules. State the name of the process.
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.