Separating a soluble solid from a liquid
I can explain how dissolving can be reversed to separate a soluble solid from a liquid.
Separating a soluble solid from a liquid
I can explain how dissolving can be reversed to separate a soluble solid from a liquid.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning 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.
- 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.
Keywords
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 misconception
Pupils sometimes use the terms evaporation and boiling interchangeably, but they are not the same.
Boiling: a liquid substance is heated & gas bubbles form. Evaporation: same, BUT only on the surface of the liquid & the gas mixes with air.
To help you plan your year 7 science lesson on: Separating a soluble solid from a liquid, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 7 science lesson on: Separating a soluble solid from a liquid, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
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The assessment exit quiz will test your pupils' understanding of the key learning points.
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Explore more key stage 3 science lessons from the Separation techniques unit, dive into the full secondary science curriculum, or learn more about lesson planning.
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Starter quiz
6 Questions
When a solid can dissolve in a liquid
When a solid cannot dissolve in a liquid
The mixture formed when a solid dissolves in a liquid
When no more solid can dissolve