Paper 1 - Covalent Bonding

Question 1

What are the main uses of Graphene?

Answer 1

• Batteries
• Filtration
• Electronics

Question 2

How does the structure of Graphite influence its physical properties e.g. electrical conductivity and hardness?

Answer 2

• Graphite’s layers are held together by weak intermolecular forces so the layers can slide over each other so it is a soft substance
• Contains a delocalised electron that is mobile and can flow

Question 3

What are the main uses of Fullerenes?

Answer 3

• Medicinal catalysts
• Strengthening materials
• Lubricants

Question 4

How does the structure of C60 Fullerence influence its physical properties e.g. electrical conductivity and hardness?

Answer 4

• Contains a delocalised electron that is mobile and can flow
• The carbon atoms are held together by strong covalent bonds and
  it has a high tensile strength so it is a hard substance

Question 5

Do simple molecules have a high or low boiling point and why?

Answer 5

• Low
• They have weak intermolecular forces that do not require a lot of energy to be overcome
• The molecules are small in size
• They are mainly liquids and gases at room temperature

Question 6

What is a covalent bond?

Answer 6

A bond formed between the sharing of electrons

Question 7

What is the chemical formula of methane?

Answer 7

CH4

Question 8

What are the uses of Graphite?

Answer 8

• Lubricant
• Pencil tips

Question 9

What are the main uses of Diamond?

Answer 9

• Drill tips
• Jewellery

Question 10

How does the structure of Diamond influence its physical properties e.g. electrical conductivity and hardness?

Answer 10

• Each carbon atom is bonded to 4 other carbon atoms with strong covalent bonds in a rigid structure so it is a hard substance
• There are no delocalised electrons that are mobile and can flow

Question 11

What is the chemical formula of ethane?

Answer 11

C2H6

Question 12

What is the chemical formula for ethene?

Answer 12

C2H4