(b) Explain why graphite can be used as a lubricant but diamond cannot.
Solution:
(a) (i) Carbon atoms in diamonds are bonded to four other carbon atoms.
The carbon atom in graphite is connected to just three other carbon atoms.
(ii) In a diamond, the crystal is arranged in a tetrahedral pattern.
The hexagonal ring structure of graphite crystals.
(b) Because of its softness, graphite may be utilised as a lubricant.
- Graphite is a material having a hexagonal crystal structure made up of layered sheets of carbon atoms.
- Graphite is a soft material with low specific gravity, low reactivity, and high electrical and thermal conductivity.
- Graphite is very soft, breaking down into thin, flexible flakes that readily glide over one another, leaving a greasy residue.
- As a result, graphite is an excellent “dry” lubricant that may be utilised in places where wet lubricants (such as lubricating oil) cannot.