# Describe the effect of increasing temperature on the kinetic energy of particles in a solid, liquid and gas, and explain how this influences the state of matter.

> Edexcel GCSE Chemistry (1CH0) — 1.1 States of matter · Describe · 4 marks

## Mark scheme (4 marks)

1. State that the kinetic energy of particles increases as temperature rises.
2. Explain that in a solid the particles vibrate around fixed positions, in a liquid they move more freely but remain close, and in a gas they move rapidly and are widely spaced.
3. State that as temperature rises, the increased kinetic energy can cause a solid to melt, a liquid to evaporate, or a gas to expand.
4. Explain that the change in state is due to the particles overcoming the forces holding them together, leading to a change in density and volume.

## Related

- [Revision notes for Edexcel GCSE Chemistry (1CH0)](https://www.gradenine.co.uk/learn)
- [How to answer "Describe" questions](https://www.gradenine.co.uk/tools/command-word-cheatsheet)
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