Year 10 - Science
Water sample analysis: distillation
Separating substances
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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 explores purification techniques, including filtration, crystallisation, and distillation. It explains formulations, uses chromatographic methods to identify pure and impure substances, and interprets chromatograms with Rf values. The emphasis is on accurate measurements.
Lesson Summary
You will learn to use distillation to purify water samples and analyse the distillate to test its purity.
Key Notes
- Distillation can be used to purify water samples.
- Boiling point data can be analysed to assess the purity of water samples.
- The more impurities present in a sample, the larger the temperature range over which the water will boil.
- Pure water boils at 100°C.
Vocabulary To Learn
- impurity: A chemical that is found in a material in very small amounts, but can change the material's properties.
- pure: A single element or compound that is not mixed with any other substance.
- sample: A smaller portion of a larger quantity of a substance.
- distillation: A separation technique that uses boiling and condensation to remove and isolate a liquid component of a mixture.
- distillate: The liquid that is condensed from the gas state during distillation.
Common Mistakes To Avoid
- All water samples boil at 100°C.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Distillation can be used to purify water samples. Boiling point data can be analysed to assess the purity of water samples.
2. Define this scientific word and use it in context. 'impurity'
A chemical that is found in a material in very small amounts, but can change the material's properties. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: All water samples boil at 100°C. Correction: If a water sample is impure, the boiling point of water increases. The greater the amount of impurities in a water sample, the larger the temperature range over which it boils.
More Lessons In This Unit
- Chromatography: paper Study Guide
- Chromatography: separating a mixture of inks Study Guide
- Comparing types of chromatography: including gas chromatography Study Guide
- Crystallisation Study Guide
- Distillation: fractional distillation Study Guide
- Distillation: separating a mixture of inks Study Guide
- Distillation: simple distillation Study Guide
- Filtration Study Guide
- Interpreting chromatograms Study Guide
- Potable water Study Guide
- Potable water: including sedimentation Study Guide
- Separating mixtures Study Guide
- Separating mixtures (including formulations) Study Guide
- Solutions Study Guide
- Wastewater treatment Study Guide
- Water sample analysis: dissolved solids Study Guide
- Water sample analysis: pH Study Guide
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