Diamond & graphite

Question 1

What is an allotrope?

Answer 1

• Different structural forms of the same element in the same physical state

Question 2

Explain the characteristics of diamond

Answer 2

• Forms a giant lattice with strong covalant bonds
• Very high MP and BP
• Doesn’t conduct electricity as no spare electrons or ions to carry charge
• Each carbon atom bonds to 4 other atoms (maximum)

Question 3

Explain the characteristics of graphite

Answer 3

• Forms a giant lattice with strong covalant bonds
• Forms layers of flat sheets. Each later is held together with weak intermolecular forces so can slide over eachother
• Soft and low MP/BP
• Can conduct heat and electricity as delocalised electrons to carry charge
• Each carbon atom bonds to 3 other atoms leaving 1 delocalised electron (carries charge)