What are allotropes? Sketch the structure of two allotropes of carbon family namely diamond and graphite. What is the impact of structure on physical properties of two allotropes?

Give reasons:
Graphite is used as lubricant.

Give reasons:
Diamond is used as an abrasive.

The atoms in __________ are arranged in layers.

The atoms in diamond are arranged in __________ pattern which account for its __________

When wood is heated in the absence of air, the residue is called ________

The residue can absorb fuel gases and is, therefore used in ___________

The residue is also used for _________ of substances, e.g. sugar. 

Difference between diamond and graphite.

Give two important uses of each of diamond and graphite.