Science at key stage 3 (Year 7)
Unit 7G: Particle model of solids, liquids and gases
Section 5: a. How can the particle model explain other phenomena?
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Objectives |
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- to apply a model to new phenomena to explain behaviour
- how discussion can help clarify ideas
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Activities |
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Outcomes |
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Children: |
- Invite pupils to carry out additional quick experiments in groups,
eg
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placing coloured crystals on agar gel and observing the diffusion of colour
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placing distinct layers of water and ink in plastic syringes and observing the mixing of colour over a short period of time
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observing dust particles in a beam of light
- Ask them to try to explain their observations using knowledge and understanding about particles, discussing their ideas with each other. Explain that they must check that the explanations they will give to the class later include use of the particle theory.
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- explain observations in terms of particles
- evaluate their own explanations and those of others
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Points to note |
- This work could be available over a period of time to allow pupils the opportunity to assimilate and apply particle theory. The specific phenomena used are not important provided they allow pupils to practise applying their knowledge.
- In unit 7H 'Solutions', pupils consider what happens when solids dissolve in liquids. This will provide them with further opportunities to apply and consolidate their knowledge.
Safety
- use forceps for handling crystals and choose those that can be handled safely
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This unit is divided into sections. Each section contains a sequence of
activities with related objectives and outcomes. You can view this unit by
moving through the sections or print/download the whole unit.
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