Question

Graphite is used as a lubricant in
machines because
(1 Point)
(a) it is a good conductor of
electricity.
(b) it has a high melting point
O
and slippery layers.
(c) its density ranges from 1.9
to 2.3 g/cm3.
O (d) it is strong and soft.​

Answer 1

Answer:

Explanation:

• Graphite is used as a lubricant in machines because it has a very high melting point and also
• yes, graphite is a very good conductor of electricity because of delocalized electrons. Graphite forms layers of a hexagonal arrangement of atoms and each carbon atom form a covalent bond with three other carbon atoms, and therefore each carbon atom has one non-bonded electron which becomes delocalized and responsible for conducting electricity.
• In this case, since the constituent molecules of graphite are held together by a strong covalent force, a high amount of energy is needed to weaken that bond. That explains graphite's high melting point
• strong

Answer 2

Answer:

Graphite has a layered structure of hexagonal rings. It has one carbon atom covalently bonded to three other carbon atoms, forming a giant hexagonal molecular structure with layers held by weak Van der Waals' forces. As the Van der Waals' forces between the layers are weak, the layers can easily slide over each other when pressured and is soft. Thus, it can be used as a lubricant.