The three common states of matter are solid state, liquid state and gas state.

A substance is the material that something is made up of.

A change of state is when a material changes from one state of matter to a different state.

If a change is reversible, it can be undone or changed back.

Reversible changes of state

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.

Three common states of {{}} are solid state, liquid state and gas state. 

What is it called when one state of matter becomes another state of matter.

 the material that has been changed can return to its original state

 the material that has been changed can't return to its original state

Match the type of change to the description.

Which of these are examples of reversible changes of state? 

Match the change of state to the reverse process. 

Which of these is **not** the name of a state of matter? 

Which process occurs when water in the liquid state changes to water vapour in the gas state?

to separate an insoluble solid from a liquid

to separate a soluble solid from a liquid

What happens when you stir a teaspoon of sugar in water?

When sugar is dissolved in water, a sugar {{}} is made.

An {{}} substance will not dissolve in a liquid.

Content guidance

Risk assessment required - equipment

Exploration of objects

Adult supervision required

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

Reversible changes of state

Lesson outcome

Content guidance

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