Dissolving
I can use the particle model to explain both how solutions form and how solutions differ from a suspension.
Dissolving
I can use the particle model to explain both how solutions form and how solutions differ from a suspension.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- Suspensions are not solutions, as solid particles can be seen, and eventually will settle over time.
- Forces of attraction between solute particles have to be overcome for something to dissolve.
- In a mixture, one particle may fit into spaces between another type, making the total volume less than expected.
- Not every substance can be dissolved (is soluble) in a solvent.
- Dissolving is not the same as melting, but both are physical processes.
Keywords
Dissolve - Occurs when a substance's particles separate and spread throughout the particles of a solvent resulting in it no longer being seen.
Insoluble - If a substance does not dissolve in a particular solvent, it is described as insoluble.
Melting - Melting occurs when a substance in the solid state is heated and its particles move into the arrangement of a substance in the liquid state.
Force of attraction - A force of attraction is a pulling force that keeps things, such as particles, close together.
Suspension - A mixture of an insoluble solid and liquid in which the solid particles are dispersed in the liquid and settle upon the mixture standing.
Common misconception
Forces of attraction are broken when a substance dissolves.
Forces of attraction are *overcome*. They are still acting between the particles, but weaker than before so a different particle arrangement
To help you plan your year 7 science lesson on: Dissolving, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 7 science lesson on: Dissolving, 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.
We use learning cycles to break down learning into key concepts or ideas linked to the learning outcome. Each learning cycle features explanations with checks for understanding and practice tasks with feedback. All of this is found in our slide decks, ready for you to download and edit. The practice tasks are also available as printable worksheets and some lessons have additional materials with extra material you might need for teaching the lesson.
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 Solutions unit, dive into the full secondary science curriculum, or learn more about lesson planning.
Equipment
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Lesson video
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Starter quiz
6 Questions
A substance into which a solute dissolves.
A substance that has dissolved into a solvent.
When a solute and solvent combine, this is formed.
When a solute dissolves, it is described as this.
Exit quiz
6 Questions
Ability to dissolve in a solvent.
Overcoming forces of attraction between solvent particles.
Changing from a solid to a liquid state.