Starter quiz
- Which of these materials are in the liquid state at room temperature (20 ºC)?
- brick
- vinegar ✓
- water ✓
- oxygen
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- What is the name of the process when a substance changes from the solid to the liquid state?
- condensing
- boiling
- melting ✓
- freezing
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- When a solid dissolves in a liquid, a ______ is produced.
- 'solution' ✓
- In a solution, when a solid dissolves in a liquid…
- you can see small pieces of the solid within the liquid.
- you can see small pieces of the solid floating on the liquid.
- you cannot see any of the solid. ✓
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- Match the following key words to their definition.
- soluble⇔can be dissolved in water or another liquid ✓
- insoluble⇔cannot be dissolved in water or another liquid ✓
- You have three mixtures of solids in front of you. Based on their appearance, which ones could be solutions?
- a transparent, colourless liquid ✓
- an opaque, white liquid
- a transparent, orange liquid ✓
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Exit quiz
- A solution is a mixture where one substance is ______ into another substance, such as a solid into a liquid.
- 'dissolved' ✓
- If a solid does not dissolve in a liquid it is said to be ______.
- 'insoluble' ✓
- A ________ is a piece of equipment used to separate insoluble solids from liquids in our everyday lives.
- beaker
- force meter
- battery
- filter ✓
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- What is a sieve?
- a type of solution
- a type of filter ✓
- a type of liquid
-
- Which of these mixtures could be separated using a sieve?
- vegetables in water ✓
- salt dissolved in water
- sugar dissolved in water
- sand in water ✓
-
- What is the name of the method used to separate insoluble solids from a liquid or a gas?
- evaporation
- filtration ✓
- distillation
- condensation
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Worksheet
Presentation
Lesson Details
Key learning points
- Some solids do not dissolve in liquids; these are called insoluble solids.
- A sieve is a type of filter that can be used to separate larger insoluble solids from a liquid.
- Different types of filters can be used to separate insoluble solids from liquids or gases.
- We use filters in everyday life to separate mixtures of solids and liquids.
Common misconception
Insoluble and soluble solids are separated from liquids using the same methods: dissolved solids, like salt and sugar, can be removed from solution by filtering.
Methods specific to the separation of insoluble solids are taught and applied in this lesson. Task A will help pupils understand that filtering does not separate dissolved solids, like salt and sugar, from a solution.
Keywords
Dissolve - If a solid dissolves in a liquid, it mixes completely with the liquid so that you can no longer see it.
Insoluble - Solids or gases that do not dissolve in a liquid are called insoluble.
Separate - To separate something means to divide it into different parts or groups.
Filter - To filter means to pour a mixture of liquid and solid through a fine mesh to separate the solid particles from the liquid.
Sieve - A sieve is a tool with a mesh of holes that lets smaller pieces pass through while keeping larger pieces behind.