Graphite is a form of carbon. Graphite is soft and slippery, making it useful as a dry lubricant.
Why is graphite soft and slippery?
Strong covalent bonds between the layers allow them to slide.
There are weak forces between the layers, allowing them to slide past each other.
Delocalised electrons prevent the layers from moving.
The carbon ions can move and slide over each other.
74 exam-style questions on OCR GCSE Chemistry Bonding. Each one has a worked solution and a mark scheme showing where the marks go.