# Simple molecules such as water (H₂O) and chlorine (Cl₂) have low boiling points, yet they contain strong covalent bonds. Explain why simple molecules have low boiling points, and explain why simple molecules cannot conduct electricity.

> Eduqas GCSE Chemistry — C2 Bonding, structure and properties · Explain · 4 marks

## Mark scheme (4 marks)

1. Simple molecules have weak intermolecular forces between molecules
2. It is the intermolecular forces (not the covalent bonds) that are broken during boiling
3. Simple molecules do not have an overall electric charge / no charged particles
4. There are no free / mobile charged particles to carry electrical charge / current

## Key terms

- [simple molecules](https://www.gradenine.co.uk/glossary/simple-molecules)
- [covalent bond](https://www.gradenine.co.uk/glossary/covalent-bond)

## Related

- [Revision notes for Eduqas GCSE Chemistry](https://www.gradenine.co.uk/learn)
- [How to answer "Explain" questions](https://www.gradenine.co.uk/tools/command-word-cheatsheet)
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Source: [GradeNine](https://www.gradenine.co.uk/q/simple-molecules-such-as-water-h-o-99c9cc3b) · Published by Druglandscape Ltd.