Year 10 - Science
Crystallisation
Separating substances
Study Hub
Study Guides
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 explain the process of crystallisation and how it is used to separate substances.
Key Notes
- Crystallisation is a technique that is used to separate a soluble solute from a solution.
- Crystallisation involves the formation of a saturated solution and temperature differences.
- Crystallisation results in the loss of the solvent to the surroundings.
Vocabulary To Learn
- saturated solution: A saturated solution is one in which no more solute can dissolve in the solvent at a given temperature.
- crystallisation: Crystallisation is a process that forms solid crystals from a saturated solution by continued removal of the solvent (e.g. evaporation).
- soluble: When a substance dissolves in a liquid, it is described as soluble in that liquid.
- solvent: A solvent is a liquid into which a solute dissolves.
Common Mistakes To Avoid
- Pupils sometimes use the terms evaporation and boiling interchangeably, but they are not the same.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Crystallisation is a technique that is used to separate a soluble solute from a solution. Crystallisation involves the formation of a saturated solution and temperature differences.
2. Define this scientific word and use it in context. 'saturated solution'
A saturated solution is one in which no more solute can dissolve in the solvent at a given temperature. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Pupils sometimes use the terms evaporation and boiling interchangeably, but they are not the same. Correction: Boiling: a liquid substance is heated and gas bubbles form. Evaporation: same, BUT only on the surface of the liquid, no bubbles form and the gas mixes with air.
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
- 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: distillation Study Guide
- Water sample analysis: pH Study Guide
Browse all guides in the Year 10 Science guide library.