Rust is a reddish brown material which forms when iron or steel reacts with water and oxygen from the air.

If a change is irreversible, it cannot be undone or changed back to its original state.

To observe is to look very closely and use other senses too.

Rusting: an irreversible change

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

{{}} forms when iron is exposed to water and oxygen and is reddish brown in colour.

Which skills are needed to monitor changes in materials as they rust?

The changes observed in rusting materials ...

Which of these are needed for rust to form? 

Rusting is an {{}} change because it cannot be undone or changed back.

A change which can be undone or changed back to its original state.

A change which cannot be undone or changed back to its original state.

Evaporation happens faster when the temperature is ...

Match the reverse process of each change of state.

At temperatures between 0°C and 100°C, water is in {{}} state.

Which gas from the air is used during burning?

Match the process to the change of state.

Content guidance

Risk assessment required - equipment

Adult supervision required

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