# Graphite is used as an electrode in electrolysis experiments. Explain why graphite is able to conduct electricity, and why it has a high melting point.

> OCR A-Level Chemistry B: Salters (H433) — 2.4 Electrons, bonding and structure · Explain · 5 marks

> Graphite is a form of carbon that is used as an electrode material in industrial electrolysis. Unlike most non-metals, graphite can conduct electricity and withstand very high temperatures.

## Mark scheme (5 marks)

1. Each carbon atom forms three covalent bonds with three other carbon atoms
2. This leaves one delocalised electron per carbon atom
3. These delocalised electrons are free to move and carry charge, allowing graphite to conduct electricity
4. Graphite is a giant covalent structure
5. A large amount of energy is needed to break the many strong covalent bonds, giving graphite a high melting point

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