# Explain why simple molecular substances, such as chlorine, have low melting points.

> AQA GCSE Chemistry (8462) — 4.2.2 How bonding and structure are related to the properties of substances · Explain · 4 marks

> Chlorine exists as simple molecules. It is a gas at room temperature and pressure.

## Mark scheme (4 marks)

1. Chlorine molecules are held together by intermolecular forces (between molecules)
2. These intermolecular forces are weak
3. Only a small amount of energy is needed to overcome / break these intermolecular forces
4. The covalent bonds within the molecule are not broken during melting

## Key terms

- [simple molecular](https://www.gradenine.co.uk/glossary/simple-molecular)

## Related

- [Revision notes for AQA GCSE Chemistry (8462)](https://www.gradenine.co.uk/learn)
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