Q35 of 312 Page 221

State one use of diamond which depend on its ‘extraordinary brilliance’ and use of graphite which depends on its being ‘black and quite soft.’

Diamonds are used in making jewellery because of its extraordinary brilliance while graphite is used for making pencils leads because of its black and soft nature.

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35 Explain why, graphite can be used as a lubricant but diamond and graphite. 35 Explain why, diamond can be used in rock drilling equipment but graphite cannot. 36 What is diamond? Of what substance is diamond made? 36 Describe the structure of diamond.