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.
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.
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Lesson video
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Starter quiz
6 Questions
liquid
solid
gas
Exit quiz
6 Questions
