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 20 °C
Temperature 0 °C
Temperature -5 °C
Temperature 20 °C
Temperature 100 °C
Temperature 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________ .