Explain why graphite conducts electricity.

Graphite conducts electricity because it has delocalised electrons that are free to move between the layers of carbon atoms. Each carbon atom in graphite forms three covalent bonds, leaving one electron per atom that is not involved in bonding, allowing it to move freely and carry an electric current.

This answer is strong because it directly addresses the role of delocalised electrons in electrical conductivity, which is the key concept being tested. It demonstrates understanding of graphite's structure and how it relates to its properties.