Reversible changes of state | Science | Quizalize & Oak National Academy

Starter quiz

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

solid state

air state ✓

gas state

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

melting

freezing

evaporation ✓

condensation
Match the process to the purpose.

sieving

⇔

to separate an insoluble solid from a liquid ✓

evaporation

⇔

to separate a soluble solid from a liquid ✓
What happens when you stir a teaspoon of sugar in water?

the sugar melts

the sugar turns into water

the sugar evaporates

the sugar dissolves ✓
When sugar is dissolved in water, a sugar ______ is made.

'solution' ✓
An ______ substance will not dissolve in a liquid.

'insoluble' ✓

Exit quiz

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

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

changing state ✓

moving state

uplevelling state

improving state
Changes of state are ______.

reversible changes ✓

irreversible reactions
Match the type of change to the description.

reversible

⇔

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

irreversible

⇔

the material that has been changed can't return to its original state ✓
Which of these are examples of reversible changes of state?

melting ✓

heating

evaporation ✓

freezing ✓

condensation ✓
Match the change of state to the reverse process.

melting

⇔

freezing ✓

evaporation

⇔

condensation ✓

Worksheet

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Lesson Details

Key learning points

The three states of matter are: solid state, liquid state and gas state.
A change of state is when one state of matter changes to another.
Changes of state are reversible changes whereby the material that has been changed can return to its original state.
Melting, freezing, evaporation and condensation are examples of reversible changes of state.

Common misconception

Children often think that ice, water and steam are three different substances and not water in different states, and that changes in state are not reversible processes.

Teaching slides will reinforce that ice (solid state), water (liquid state), and water vapour (gas state) are all water and show which processes can be used to reverse state changes. This will be further explored and embedded during practice tasks.

Keywords

State - The three common states of matter are solid state, liquid state and gas state.
Substance - A substance is the material that something is made up of.
Change of state - A change of state is when a material changes from one state of matter to a different state.
Reversible - If a change is reversible, it can be undone or changed back.