Year 7 - Science
Separating a soluble solid from a liquid
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 explain how dissolving can be reversed to separate a soluble solid from a liquid.
Key Notes
- Evaporation can remove solvent from a solution, leading to the production of a saturated solution.
- Crystallisation reforms a solute as crystals from a saturated solution following a change in conditions.
- Solvents evaporate into the air around you during the process of crystallisation.
- Larger crystals form when the solvent evaporates more slowly.
- Heating a solution makes the solvent evaporate more quickly.
Vocabulary To Learn
- solute: A solute is a substance that has dissolved into a solvent.
- solvent: A solvent is a liquid into which a solute dissolves.
- evaporation: Occurs when a substance's particles are in the liquid state at its surface with enough energy to change to the gas state and mix with air.
- crystallisation: A process that forms solid crystals from a saturated solution by evaporating the solvent.
- crystal: A crystal is a solid whose particles are arranged in a highly ordered, repeating pattern.
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.
Evaporation can remove solvent from a solution, leading to the production of a saturated solution. Crystallisation reforms a solute as crystals from a saturated solution following a change in conditions.
2. Define this scientific word and use it in context. 'solute'
A solute is a substance that has dissolved into a solvent. 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 & gas bubbles form. Evaporation: same, BUT only on the surface of the liquid & the gas mixes with air.
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