# Magnesium ribbon is placed into dilute hydrochloric acid. Bubbles of gas are produced and the magnesium disappears. Explain what has happened to the magnesium atoms and to the hydrogen ions in terms of oxidation and reduction.

> Cambridge International IGCSE Chemistry (0620) — 6.4 Redox · Explain · 4 marks

> Magnesium ribbon reacts vigorously with dilute hydrochloric acid. The solid magnesium disappears and bubbles of a colourless gas are produced.

## Mark scheme (4 marks)

1. Magnesium atoms lose electrons
2. Magnesium is oxidised
3. Hydrogen ions gain electrons
4. Hydrogen ions are reduced

## Key terms

- [oxidation](https://www.gradenine.co.uk/glossary/oxidation)
- [reduction](https://www.gradenine.co.uk/glossary/reduction)
- [hydrogen ions](https://www.gradenine.co.uk/glossary/hydrogen-ions)

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