INTERNATIONAL PRIMARY SCIENCE
How does it look?
1
Draw a particle model of a solid and a liquid.
2 Draw a line from the picture to the particle model that it belongs to.
Disappearing water
1 Some students are investigating if water changes to water vapour faster when the temperature is warmer.
a Is water a solid, a liquid or a gas?
b Is water vapour a solid, a liquid or a gas?
c What is the name of the process that changes water to water vapour? Circle the correct answer.
2 Some students place a beaker of water containing 10 cm3 of water in four different places at different temperatures.
Beaker A was at 15°C.
Beaker B was at 20°C.
Beaker C was at 25°C.
Beaker D was at 30°C.
a Which bar shows the result for Beaker A? .
b Which bar shows the result for Beaker C?
c Describe how the temperature affects the time taken for the water to evaporate.
As the temperature increases freezing condensation evaporation melting
Changing the state of water
1 Place the small pot in the centre of the bowl of water. Do not get any ice inside.
You will need:
● a large bowl
● a small plastic cup or yoghurt pot
● plastic film
● ice cubes
● a small weight
● a sunny window sill
2 Place the ice blocks around the small pot in the large bowl to a depth of several centimetres.
3 Cover the large bowl with plastic film and secure it to the outside of the bowl.
4 Put a weight on top of the plastic film, over the centre of the small pot, so that the plastic film is pushed down into it slightly.
5 Leave the set-up on a warm, sunny window sill for a few days.
a What did you observe after the first day?
b What did you observe after 5 days?
c Why did you leave the set-up in a sunny place?
6 Draw diagrams, with labels, to show the changes of state.
Say when you noticed the changes of state.
Start of the experiment
First change of state noted on
Second change of state noted on
Final change of state noted on