Bicarbonate of soda is a white powder, used in baking.

Foods that contain acids have a sour taste.

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

Carbon dioxide is a type of gas that is in the air around us.

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

More irreversible changes

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

During an irreversible change, the material that has been changed …

What is produced when bicarbonate of soda is mixed with acid?

Because the oxygen produced makes batters rise.

Because the carbon dioxide produced makes food sweeter.

Because the carbon dioxide produced makes bread, batter and cakes rise.

Because the oxygen produced makes food a more appealing colour.

Why is bicarbonate of soda mixed with acids in recipes? 

Match the type of change to the example.  

A {{}} change is where a material that has changed can return to its original state.

What type of change is it when sugar dissolves in water?

Which greenhouse gas is produced by burning fossil fuels? 

Content guidance

Risk assessment required - equipment

Adult supervision required

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

More irreversible changes

Lesson outcome

Content guidance

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