More reversible changes | Science | Quizalize & Oak National Academy

Starter quiz

Which of these are states of matter?

solid state ✓

ice state

gas state ✓

water state
At what temperature does liquid water change to ice?

0°C ✓

100°C

80°C

50°C
Match the name of the process to the description:

melting

⇔

when a substance changes from its solid state to its liquid ✓

dissolving

⇔

when a solid is broken into very small pieces and disappears ✓
What happens when you stir sand in water?

the water evaporates, leaving the sand

the sand dissolves in the water

the sand makes a mixture with the water ✓
A ______ substance dissolves in a liquid.

'soluble' ✓
True or false? You can recover a dissolved solid from a solution by filtration.

True
False ✓

Exit quiz

If a change is reversible …

it can be undone or changed back to its original state. ✓

a new material is produced.

it cannot be undone or changed back to its original state.
What process can be used to reverse evaporation?

'condensation' ✓
A mixture is material that contains two or more different substances, which can be physically ...

mixed.

undone.

reversed.

separated. ✓
What happens to a soluble solid when it dissolves?

It changes into the liquid.

It is broken down to become so tiny we can no longer see it. ✓

It melts so we can no longer see it.
Is making a mixture a reversible or irreversible process?

reversible ✓

ireversible
How can you recover dissolved solids from a solution?

condensation

evaporation ✓

filtering

freezing

Worksheet

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Lesson Details

Key learning points

If a change is reversible, it can be undone or changed back to its original state.
A mixture is material that contains two or more different substances, which can be physically separated.
When a soluble solid dissolves, it is broken down to become so tiny we can no longer see it, but it is still there.
Dissolving is a reversible process. Evaporation can be used to recover soluble solids from solutions.

Common misconception

Changes in state and dissolving and mixing are not reversible processes.

Teaching slides will show which processes can be used to reverse state changes and dissolving. This will be explored and embedded during the practice tasks.

Keywords

State - The three common states of matter are solid state, liquid state and gas state.
Recover - To recover is to get back something that had changed or was taken away.
Reversible - If a change is reversible, it can be undone or changed back to its original state.
Dissolve - If a solid dissolves in a liquid, it mixes so completely with the liquid that it cannot be seen.
Mixture - A mixture can be physically separated.