Name:______________________
Changes of state
The diagrams below show water particles at 5 different temperatures. Can you guess the temperature for each diagram? Give reasons for your answer using the position and movement of the particles as evidence.
Temperature Temperature Temperature Temperature Temperature Temperature
20 °C 0 °C -5 °C 20 °C 100 °C 120 °C
Reason: Ice is melting. Some of the particles are in a fixed pattern like in a s________, but others are moving in different directions like in a liquid. Reason: All of the particles are in a fixed pattern. The water is therefore a s_________ (ice) and the temperature must be below _______°C. Reason: The particles are moving randomly and there are gaps between them. It is therefore a g______ (steam). Reason: Some of the particles are close together and sliding over each other and others are escaping from the surface. The water is b_____________ . Reason: The particles are sliding over each other but have not escaped from the surface. The water is a l________ .