Starter quiz
A ______ change is where a material that has changed can return to its original state.- 'reversible' ✓
- What type of change is it when sugar dissolves in water?
- reversible ✓
- irreversible
- change of state
-
Which of these metals rust?- aluminium
- steel ✓
- iron ✓
- silver
-
Match the type of change to the example.- irreversible⇔steel rusting ✓
- reversible⇔water freezing ✓
- Which gas is needed for rust to form?
- nitrogen
- carbon dioxide
- oxygen ✓
-
- Which greenhouse gas is produced by burning fossil fuels?
- oxygen
- nitrogen
- carbon dioxide ✓
- helium
-
Exit quiz
Vinegar is an example of a mild ______.- 'acid' ✓
- Which of these are acids?
- orange ✓
- lemon ✓
- bicarbonate of soda
- honey ✓
-
- During an irreversible change, the material that has been changed …
- cannot return to its original state. ✓
- can return to its original state.
-
What is produced when bicarbonate of soda is mixed with acid?- carbon dioxide gas ✓
- nitrogen gas
- oxygen gas
-
Why is bicarbonate of soda mixed with acids in recipes?- 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.
-
- Match the type of change to the example.
- reversible change⇔salt dissolving in water ✓
- irreversible change⇔acid reacting with bicarbonate of soda ✓
Worksheet
Presentation
Video
Lesson Details
Key learning points
- Vinegar is an example of an acid that we find in our homes.
- Bicarbonate of soda is a white powder used in baking to make bread, batter and cakes rise when baked.
- When vinegar and bicarbonate of soda are mixed, this produces a new material in the form of carbon dioxide gas.
- The action of acid with bicarbonate of soda is an irreversible change.
- During an irreversible change, the material that has been changed cannot return to its original state.
Common misconception
All bubbles produced contain air and that it is a reversible change.
Teaching slides explain that the bubbles produced when acids react with bicarbonate of soda contain carbon dioxide and that this change is irreversible as a new material is produced.
Keywords
Bicarbonate of soda - Bicarbonate of soda is a white powder, used in baking.
Acids - Foods that contain acids have a sour taste.
Observe - To observe is to look very closely and use other senses too.
Carbon dioxide - Carbon dioxide is a type of gas that is in the air around us.
Irreversible change - If a change is irreversible, it cannot be undone or changed back to its original state.
+