3. Chemical Bonding

Question 1

Boron trifluoride, BF3, and aluminum fluoride, AlF3, differ markedly in their physical properties. They have melting points -144°C and 1291°C respectively.

Explain, in terms of structure and bonding, the difference in the melting points of the two compounds.

Question 2

Boron trifluoride, BF3, and aluminum fluoride, AlF3, differ markedly in their physical properties. They have melting points -144°C and 1291°C respectively.

Explain, in terms of structure and bonding, the difference in the melting points of the two compounds.

Question 3

What is the difference in colour between diamond and graphite?

Answer 3

Diamond - Colourless and transparent

Graphite - Black and opaque

Question 4

What is the difference between the hardness of diamond and graphite?

Answer 4

Diamond - Very hard

Graphite - Very soft and slippery

Question 5

What is the difference in electrical conductivity for diamond and graphite?

Answer 5

Diamond - Very poor

Graphite - Very good along the layers

Question 6

Properties of metal?
Electrical conductivity.
Ionisation energy.
Electronegativity.
Physical properties.

Answer 6

• Good conductor of electricity
• Low ionisation energy
• Low electronegativity
• Shiny, malleable and ductile