# Zinc oxide can be reduced by heating it with carbon. The equation for this reaction is: ZnO + C → Zn + CO. Explain what has been oxidised and what has been reduced in this reaction, giving a reason for each answer.

> Edexcel A-Level Chemistry (9CH0) — 3.1 Oxidation and reduction · Explain · 5 marks

## Mark scheme (5 marks)

1. Carbon has been oxidised
2. Because carbon gains oxygen (to form carbon monoxide)
3. Zinc oxide has been reduced
4. Because zinc oxide loses oxygen (to form zinc)
5. This reaction is an example of a redox reaction because oxidation and reduction occur simultaneously

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