C2 Bonding (Part 2)

Question 1

(NANOTUBES)

Describe and explain the properties of allotropes of carbon.

Answer 1

Nanotubes
 – cylindrical fullerene with high length to 
diameter ratio
- High tensile strength (strong bonds)
- Conductivity (deloc. electrons)

Question 2

(GRAPHENE)

Describe and explain the properties of allotropes of carbon.

Answer 2

Graphene - a single layer of graphite.

Question 3

Simple covalent bond.

• What is BP/MP
• Conductivity when Solid
• Conductivity when molten
• General description

Answer 3

Low Boiling Point + Melting Point
- weak intermolecular

Poor Conductivity when Solid
- no ions to conduct

Poor Conductivity when Molten
- no ions to conduct

General description: mostly gases and liquids

Question 4

Ionic bond

• What is BP/MP
• Conductivity when Solid
• Conductivity when molten
• General description

Answer 4

High Boiling Point and Melting Point
- giant lattice of ions with strong forces between oppositely charged ions

Poor conductivity when solid
- ions cant move

Good conductivity when molten
- ions are free to move

General description: crystalline solids

Question 5

Giant covalent bond

• What is BP/MP
• Conductivity when Solid
• Conductivity when molten
• General description

Answer 5

High Boiling Point and Melting Point
- Many strong covalent bonds between atoms in giant structure

Good conductivity when solid (GRAPHITE)
- free delocalised electrons between layers can move through structures
Poor conductivity when solid (DIAMOND, SAND)
- electrons cant move

Poor conductivity when molten

General description: solids

Question 6

Metallic bond

• What is BP/MP
• Conductivity when Solid
• Conductivity when molten
• General description

Answer 6

High Boiling Point and Melting Point
- strong electrostatic forces between positive ions and delocalised electrons

Good conductivity when solid
- delocalised electrons free to move through structure

Good conductivity when molten

General description: Shiny metal solids