Year 8 · Science

Changes of state: Year 8 recap and practice

6 checked activities 3 video matches

Start here

Focus on changes of state particle model heating and cooling. Start with “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

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
Understand the Relationship Between Changes in Temperature and Changes of State
Understand What Happens When Substances are Cooled
Understand What Happens When Substances are Heated

Learning path

These same-subject links were reviewed as the foundations for this topic and the learning it directly unlocks.

Learn this first

Year 7Changes of state with the particle model: Year 7
Introduces the particle explanation for reversible changes of state that Year 8 now applies in greater depth.
Year 8Particle Model
Provides the particle-energy language needed to distinguish evaporation, boiling, freezing and condensing.

Where this leads next

Year 8Separating Mixtures
Uses evaporation, boiling and condensing as the working principles behind separation methods.
Year 8Conservation Of Mass
Extends the unchanged-particle idea to reasoning about mass before and after a physical change.

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