sc7

Question 1

what is the form of graphite and diamonds?

Answer 1

giant covalent substances

Question 2

what is the structure of diamond?

Answer 2

• each carbon joined to 4 other carbons —> no delocalised electrons so doesn’t conduct electricity
• has a high melting point due to a lot of covalent bonds
• hard

Question 3

what is the structure of graphite?

Answer 3

• each carbon is covalently bonded to 3 other carbons —> has delocalised electrons so can conduct electricity
• layers of hexagonal rings —> layers are bonded with weak intermolecular forces so can slide over each other, making it soft

Question 4

what are some uses of graphite and diamonds?

Answer 4

graphite :

1. electrodes -> can conduct electricity
2. lubricant -> soft and slippery

diamond :

1. cutting tools -> hard and rigid
2. jewellery -> high melting point

Question 5

what is the structure of graphene?

Answer 5

• single layer of graphite
• can conduct electricity
  —> useful in electronics