# Explain what is meant by a reversible reaction reaching a state of dynamic equilibrium in a closed system.

> Cambridge International IGCSE Chemistry (0620) — 6.3 Reversible reactions and equilibrium · Explain · 4 marks

## Mark scheme (4 marks)

1. A reversible reaction is one that can proceed in both the forward and reverse directions
2. The system must be closed so that no substances can enter or leave
3. The rate of the forward reaction equals the rate of the reverse reaction
4. The concentrations of reactants and products remain constant (not necessarily equal)

## Key terms

- [reversible reaction](https://www.gradenine.co.uk/glossary/reversible-reaction)
- [dynamic equilibrium](https://www.gradenine.co.uk/glossary/dynamic-equilibrium)
- [closed system](https://www.gradenine.co.uk/glossary/closed-system)

## Related

- [Revision notes for Cambridge International IGCSE Chemistry (0620)](https://www.gradenine.co.uk/learn)
- [How to answer "Explain" questions](https://www.gradenine.co.uk/tools/command-word-cheatsheet)
- [Practice this with AI marking (free)](https://www.gradenine.co.uk/start)

---
Source: [GradeNine](https://www.gradenine.co.uk/q/explain-what-is-meant-by-a-e6a586fc) · Published by Druglandscape Ltd.