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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Presentation

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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.