Year 7 - Science
Distillation: practical
Separation techniques
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit covers techniques for separating mixtures, including filtration, evaporation, distillation, and chromatography, as well as identifying pure substances. Conduct experiments safely, record observations, evaluate methods, and suggest improvements.
Lesson Summary
You will learn to compare two types of distillation and successfully use distillation to separate a mixture of miscible liquids.
Key Notes
- 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.
Vocabulary To Learn
- 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.
Common Mistakes To Avoid
- Pupils think that heating a substance strongly and for extended periods will improve distillation.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key 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.
2. Define this scientific word and use it in context. 'distillation'
Distillation is a separation technique that uses boiling and condensation to remove and isolate the liquid part of a mixture. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Pupils think that heating a substance strongly and for extended periods will improve distillation. Correction: Stress that distillation is a skill which requires careful control of heating so only one substance is in the condenser at a time.
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