Graphite's structure means it has certain properties.
1. The weak bonds between the layers in graphite are easily broken, so the sheets can slide over each others - graphite feels slippery and is used as a dry lubricant and in pencils.
2. The 'delocalise' electrons in graphite aren't attatched to any particular carbon atoms and are free to move along the sheets, so an electric current can flow.
3. The layers are quite far apart compared to the length of the covalent bonds, so graphite has a low density and is used to make strong, lightweight sports equipment.
4. Because of the strong covalent bonds in the hexagon sheets, graphite has a very high melting point (it sublimes at over 3900K)
5. Graphite is insoluble in any solvent. The covalent bonds in the sheets are too difficult to break.
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