Matter exists in three states: solid, liquid, and gas.
During a cold night, a puddle of water on a driveway freezes into ice.
In which of the three states is:
(i) the water in the puddle before it freezes,
(ii) the frozen ice,
(iii) the water vapour in the air above the puddle?
All of the following words are names of processes that can occur during a change of state:
boiling, condensation, evaporation, melting, solidification \text{boiling, ~ condensation, ~ evaporation, ~ melting, ~ solidification} boiling, condensation, evaporation, melting, solidificationState which of these is used to describe what happens to the liquid water as it turns into ice.
When the liquid water turns into ice, what happens to the energy stored in the water?
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.