Year 8 · Science
Changes of state: Year 8 recap and practice
Start here
Focus on changes of state particle model heating and cooling. Open support for “Investigate The Movement of Particles in Changes of State”, then explain the idea in your own words.
Understand the key idea
Changes of state are reversible physical changes. Heating increases particle energy until particles can overcome the forces holding them in place, giving melting and then boiling. Cooling reverses this, giving condensing and freezing. Mass is conserved throughout because no particles are created or destroyed.
Common mix-up
Evaporation and boiling are not the same. Evaporation happens only at the surface and at any temperature, while boiling happens throughout the liquid at its boiling point.
Try this first
- Name the change of state for each arrow on a states-of-matter triangle.
- Explain why a puddle dries up without ever reaching 100 °C.
- Predict what happens to mass when water freezes.
Ask: How can a wet shirt dry on the line when it is nowhere near boiling?
Year 8 learners practise changes of state particle model heating and cooling.
The activities include Investigate The Movement of Particles in Changes of State, Understand Changes of State and Forces of Attraction, Understand The Movement of Particles in Changes of State, and related practice. The checked support below includes teaching, video, worksheet. Open a resource in its provider's website and choose the format that best helps the learner explain the idea independently.
Activities covered
Finish one activity, then tap Done to earn one Den Drop ticket. You can earn up to 3 tickets each day.
- Investigate The Movement of Particles in Changes of State — support from Oak National Academy
- Understand Changes of State and Forces of Attraction — support from Oak National Academy
- Understand The Movement of Particles in Changes of State — support from Oak National Academy
- Understand the Relationship Between Changes in Temperature and Changes of State — support from Oak National Academy
- Understand What Happens When Substances are Cooled — support from Oak National Academy
- Understand What Happens When Substances are Heated — support from Oak National Academy
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Watch it explained
watch a video explanation
Oak: Particle Model Of Substances In The Gas State
Best for: a clear explanation before you practise
Oak: Melting Particle Model
Best for: a clear explanation before you practise
Oak: Boiling And Condensing
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Learn it properly
lessons and teaching pages
Oak lesson slides: Particle Model Of Substances In The Gas State
Best for: worked examples and step-by-step teaching
What are changes of state?
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Solids, liquids and gases - KS3 Physics
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Practise it
questions and activities to try
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Print and finish
worksheets away from the screen
Oak worksheet: Particle Model Of Substances In The Gas State
Best for: pencil-and-paper practice away from the screen
Oak worksheet: Melting Particle Model
Best for: pencil-and-paper practice away from the screen
Oak worksheet: Boiling And Condensing
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