Some solids dissolve in liquids to form a solution.

Evaporation is the change of state from a liquid to a gas.

Condensation is the change of state from a gas to a liquid.

Desalination is the process of removing salt from seawater.

Removing salt from seawater (non-statutory)

Science

In this Properties, changes and separating materials unit, pupils learn to decide how mixtures might be separated, including through filtering, sieving and evaporating. In the Materials challenge unit, they will build on this knowledge to apply their understanding of separating materials to a wider range of everyday situations

In the Everyday materials unit, pupils learnt to compare and group together a variety of everyday materials on the basis of their simple physical properties. In this Properties, changes and separating materials, pupils will build on this knowledge to compare an group together everyday materials on the basis of a wider variety of properties

Properties, changes and separating materials

Physical activity and equipment requiring safe use

Use of equipment that may require supervision for safety, e.g. scissors in KS1, needles, paint, knives, cooking.

True or false? The water in our seas and oceans contains salt.

What process can we use to remove the water from a salt solution?

What is the name of water in the gas state?

Condensation is when water in the gas state is {{}} so that it changes to water in the liquid state.

Scientists and engineers investigate ways of making seawater safe to drink using...

Which of these are tiny living things that must be removed from water to make it safe to drink?

A solid which is soluble in water will {{}} in water. 

Which of these materials are soluble in water? 

Match the temperatures of water with its state: solid, liquid or gas.

When a solution is heated using an oil burner, what process takes place? 

If you carried out evaporation on a salt solution, what would be left behind?  

Content guidance

Risk assessment required - equipment

Adult supervision required

This lesson will be removed by end of Summer Term 2025.

Removing salt from seawater (non-statutory)

Lesson outcome

Content guidance

This lesson will be removed by end of Summer Term 2025.