1.1. The following boxes show some information about the structures of diamond and graphite.

Each carbon atom is bonded strongly to four others. All four outer electrons are used in bonding.	Each carbon atom is bonded strongly to three others. They form layers that are held together weakly. Three electrons are involved in bonding whilst the other moves freely between the layers.

State why both substances have high melting points.

1.2. State which of the above substances will conduct electricity. Give a reason for your answer. 

Substance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

1.3. Graphite is used in pencils. Explain in terms of structure why this is possible.