# Describe how a hydrogen-oxygen fuel cell produces electrical energy, including what happens at each electrode and what is produced overall.

> Cambridge International IGCSE Chemistry (0620) — 4.2 Hydrogen-oxygen fuel cells · Describe · 4 marks

## Mark scheme (4 marks)

1. Hydrogen is supplied to / oxidised at the negative electrode (anode)
2. Oxygen is supplied to / reduced at the positive electrode (cathode)
3. Electrons flow through the external circuit, producing an electric current
4. Water is the only product / overall product

## Key terms

- [fuel cell](https://www.gradenine.co.uk/glossary/fuel-cell)
- [electrode](https://www.gradenine.co.uk/glossary/electrode)

## Related

- [Revision notes for Cambridge International IGCSE Chemistry (0620)](https://www.gradenine.co.uk/learn)
- [How to answer "Describe" questions](https://www.gradenine.co.uk/tools/command-word-cheatsheet)
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Source: [GradeNine](https://www.gradenine.co.uk/q/describe-how-a-hydrogen-oxygen-fuel-cell-b60dda1a) · Published by Druglandscape Ltd.