Melting: particle model
I can use the particle model to explain why substances have different melting points, and use a thermometer to measure melting points.
Melting: particle model
I can use the particle model to explain why substances have different melting points, and use a thermometer to measure melting points.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- In the solid state, forces of attraction between particles hold them in fixed positions.
- In the liquid state, particles are held together but have enough energy to break free to move around.
- The stronger the force of attraction between particles in a substance, the higher its melting point.
- Water freezes at 0℃, room temperature is about 20℃ and body temperature is about 37℃.
- The bulb of a thermometer is made of very thin glass and is delicate.
Keywords
Melting - Melting is when a substance changes from a solid state to a liquid state.
Melting point - The melting point of a substance is the temperature at which it changes from solid state to a liquid state.
Forces of attraction - Forces of attraction hold particles together.
Regular arrangement - In a solid state the particles are in a regular arrangement.
Random arrangement - In a liquid state the particles are in a random arrangement.
Common misconception
Particle spacing can be overemphasised at the expense of particle movement.
Ensure students understand that although particles can move over each other, the forces of attraction mean that the particles are touching.
To help you plan your year 7 science lesson on: Melting: particle model, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 7 science lesson on: Melting: particle model, 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 Solid, liquid, gas states and changes of state unit, dive into the full secondary science curriculum, or learn more about lesson planning.
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Lesson video
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Starter quiz
6 Questions
Solid state
Liquid state
Gas state