Starter quiz
- The three states of matter are: solid, ______, and gas.
- 'liquid' ✓
- Which of the following are examples of materials in the solid state at room temperature?
- oxygen
- fizzy drink
- a building brick ✓
- milk
- scissors ✓
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- All matter is made up of ______.
- 'particles' ✓
Match the state of matter with the correct particle diagram.- a⇔liquid ✓
- b⇔solid ✓
- c⇔gas ✓
- Which description correctly describes a substance's melting point?
- The temperature at which a liquid turns into a gas.
- The temperature at which a liquid turns into a solid.
- The temperature at which a gas turns into a liquid.
- The temperature at which a solid turns into a liquid. ✓
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What properties would you expect of a material with this particle arrangement?- can be compressed
- cannot be compressed ✓
- can flow ✓
- particles only vibrate in fixed positions
- cannot change shape
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Exit quiz
- A ______ material is composed of only one type of chemical.
- 'pure' ✓
- Which of the following is an example of a pure substance?
- sea water
- iron ✓
- air
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- What is the name given to a substance found in a material in very small amounts, but which can alter the material's properties?
- 'impurity' ✓
- Complete this sentence: A significant feature of a mixture is that it...
- is composed of only two chemicals.
- can be easily separated. ✓
- boils at a single, distinct temperature.
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- Which diagram correctly represents a mixture in the solid state?
- Which of these statements about mixtures are true?
- Mixtures boil at a single, specific temperature.
- Mixtures contain only three types of chemicals.
- Mixtures boil over a range of temperatures. ✓
- Mixtures always include water.
- Mixtures must contain at least two types of chemicals. ✓
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Worksheet
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Presentation
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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
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.
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
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