Separating soluble solids from solutions | Science | Quizalize & Oak National Academy

Starter quiz

What method is often used to separate an insoluble solid from a liquid?

mixing

filtering ✓

cooling

stirring

dissolving
At a temperature below 0°C, water is in a _________ state.

solid ✓

gas

liquid
Melting happens when you ...

heat a gas.

heat a solid. ✓

heat a liquid.
What is the name of the process when a liquid turns into a solid?

melting

condensation

evaporation

freezing ✓
What is the name of the process when a gas turns into a liquid?

melting

condensation ✓

evaporation

freezing
Which of these materials is soluble in water?

flour

salt ✓

sand

sugar ✓

Exit quiz

A solid that dissolves in a liquid is ______.

'soluble' ✓
A solid dissolved in a liquid forms a __________.

solvent

soluble

solution ✓

insoluble
Which of these methods cannot be used to recover soluble solids from a solution?

evaporation

filtering with a filter paper ✓

sieving ✓
Match the type of solid to the method which can be used to recover it from a liquid.

soluble solids

⇔

evaporating ✓

small insoluble solids

⇔

filtering ✓

large insoluble solids

⇔

sieving ✓
Water is evaporating from the clothes on the washing line. Evaporation is when …

a solid changes into a gas.

a liquid changes to a solid.

a liquid changes to a gas. ✓

a gas changes to a liquid.
When the liquid part of a solution evaporates, what is left behind?

the solid that was dissolved in the liquid ✓

a new solid

a gas

Worksheet

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Lesson Details

Key learning points

A solid that dissolves in a liquid is called soluble. This makes a solution.
Soluble solids can not be recovered using filtering.
Soluble solids can be recovered from a liquid using evaporation.
Evaporation is when a liquid changes to invisible water vapour (gas) in the air.

Common misconception

A dissolved solid ceases to be present in the solution it forms – it turns into water. When you pass salt water through a filter paper, the salt is removed.

Children carry out practical activities to discover which methods can and cannot be used to recover salt from a solution.

Keywords

Dissolve - If a solid or gas dissolves in a liquid, it mixes so completely with the liquid that it cannot be seen.
Soluble - Solids and gases that dissolve in a liquid are soluble.
Solution - A solution is a mixture of a liquid with a dissolved solid or gas.
Separate - To separate something, you put different parts of it into different groups.
Evaporate - To evaporate is to change from a liquid to a gas.