Pure substances
I can describe the difference between a pure substance and a mixture.
Pure substances
I can describe the difference between a pure substance and a mixture.
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Lesson details
Key learning points
- A pure material is made of only one type of substance
- A pure material has a fixed melting point and boiling point
- Impurities change the melting and boiling point of a material
- A mixture contains two or more types of substances which can be easily separated
- Mixtures melt or boil over a range of temperatures
Keywords
Pure substance - A pure substance contains only one type of chemical
Mixture - A mixture is a material that contains two or more different substances which can be physically separated
Impurity - An impurity is a chemical that is found in a material in very small amounts, but can change the material's properties
Common misconception
Pupils mistake common (everyday) usage of pure (i.e. 'pure orange juice) as being a pure substance
'Everyday' usage refers to one *source* whereas scientific usage refers to particle composition. Take particular care when discussing water.
To help you plan your year 7 science lesson on: Pure substances, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 7 science lesson on: Pure substances, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
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The assessment exit quiz will test your pupils' understanding of the key learning points.
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Explore more key stage 3 science lessons from the Solutions unit, dive into the full secondary science curriculum, or learn more about lesson planning.
Equipment
See additional materials.
Content guidance
- Risk assessment required - chemicals
- Risk assessment required - equipment
Supervision
Adult supervision required
Licence
Lesson video
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Starter quiz
6 Questions
liquid
solid
gas
Exit quiz
6 Questions
