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

The atoms in __________ are arranged in layers.

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

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 two important uses of each of diamond and graphite.

Give reasons:
Graphite is used as lubricant.

Give reasons:
Diamond is used as an abrasive.

Difference between diamond and graphite.

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

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