# Copper(II) sulfate solution is stored in a laboratory. A student adds excess zinc powder to the copper(II) sulfate solution and observes a colour change. Explain what happens during this reaction, including why zinc is able to displace copper from solution.

> Edexcel A-Level Chemistry (9CH0) — Topic 4 Physical chemistry and transition elements · Explain · 5 marks

> Copper(II) sulfate solution is blue. Zinc is a metal found above copper in the reactivity series.

## Mark scheme (5 marks)

1. Zinc displaces copper from solution / this is a displacement reaction
2. Zinc is higher in the reactivity series than copper / zinc is more reactive than copper
3. Zinc atoms lose electrons / zinc is oxidised
4. Copper(II) ions gain electrons / copper ions are reduced
5. The blue colour fades / solution becomes colourless as copper(II) ions are removed from solution AND/OR a brown/pink solid (copper) is deposited

## Related

- [Revision notes for Edexcel A-Level Chemistry (9CH0)](https://www.gradenine.co.uk/learn)
- [How to answer "Explain" questions](https://www.gradenine.co.uk/tools/command-word-cheatsheet)
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