Starter quiz
- True or false? The condenser in a distillation setup should be kept warm.
- True
- False ✓
Match the equipment labels to the correct scientific terms.- a⇔mixture ✓
- b⇔thermometer ✓
- c⇔water out ✓
- d⇔water in ✓
- e⇔distillate (pure substance) ✓
- The vapour formed during distillation turns back into a liquid in the ...
- 'condenser' ✓
- True or false? Boiling is a cooling process that occurs when a liquid turns into a gas.
- True
- False ✓
- What is the product called that is collected after it has been condensed in a distillation process?
- 'distillate' ✓
- Which of the following mixtures have components that can be separated using distillation?
A mixture of dirt, salt and water ✓
A mixture of coloured sweets
A mixture of water and oil ✓
A mixture of different seeds and dirt
Exit quiz
- True or false? Simple distillation can be used to separate mixtures with widely varying boiling points.
- True ✓
- False
- The process of turning a substance in the gas state back into a liquid during distillation is called ...
- 'condensation' ✓
- Why, during simple distillation, should the mixture be heated slowly?
- To allow for multiple components of the mixture to vaporise together.
- Decrease the boiling point of the mixture.
- For controlled boiling of one substance at a time. ✓
-
- The purpose of keeping the condenser cool in distillation is to:
- Prevent boiling of the substances in the mixture.
- Increase evaporation of substances in the mixture.
- Ensure the gas changes into a liquid before it leaves the condenser. ✓
- Decrease the time taken for distillation.
-
- True or false? Simple distillation is used to separate a mixture containing 4 substances with similar boiling points.
- True
- False ✓
- Match the distillation-related terms with their correct definitions.
- Fractional distillation⇔Separate complex mixtures with similar boiling points ✓
- Condenser⇔Apparatus used to cool vapour back into liquid ✓
- Distillate⇔The liquid that has been condensed from vapour ✓
- Simple distillation⇔Separates basic mixtures and removes just one liquid ✓
- Boiling point⇔The temperature at which a liquid turns into a gas ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Simple distillation is used to separate a mixture containing only two substances.
- Fractional distillation separates mixtures with 3+ substances, or substances with similar boiling points.
- Slower heating during distillation allows for more controlled boiling of individual components.
- If the condenser warms up it becomes less effective and more gas will escape.
Common misconception
Students think that heating a substance strongly and for extended periods will improve distillation.
Stress that distillation is a skill which requires careful control of heating so only one substance is in the condenser at a time.
Keywords
Distillation - Distillation is a separation technique that uses boiling and condensation to remove and isolate the liquid part of a mixture.
Fraction - A fraction is a part of something whole (e.g. a slice of cake).
Boiling - Boiling occurs when a substance in the liquid state is heated and changes to the gas state with gas bubbles formed.
Condensation - Condensation is the process by which a substance in the gas state is cooled and changes to a liquid state.
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