Covalent Networks

Question 1

Explain the structure and bonding of covalent networks (graphite)

Answer 1

Graphite is made up of carbon atoms where each carbon is bonded to 3 other carbons in 2D layers/sheets. There is one valance electron from each carbon that is not used for bonding. There are strong covalent bonds between carbons, but weak intermolecular bonds between 2D layers/sheets.

Question 2

Explain the structure and bonding of covalent networks (3D structures)

Answer 2

3D structures are made up out of atoms bonded to 4 other atoms in a giant 3D lattice. These atoms are bonded together by strong covalent bonds

Question 3

Explain the conductivity of covalent networks (graphite)

Answer 3

Due to their being a free valance electron from each carbon atom graphite can conduct electricity

Question 4

Explain the conductivity of covalent networks (3D structure)

Answer 4

All electrons are held in fixed covalent bonds and are unable to move therefore they can’t electricity.

Question 5

Explain the map/bp of covalent networks

Answer 5

Covalent networks have strong covalent bonds, therefore a large amount of heat energy is required to overcome the covalent bonds and melt it. The temperature of the melting point is high.

Question 6

Explain the malleability/brittleness/hardness of covalent networks (hardness)

Answer 6

Generally considered to be hard, as they are held together by strong covalent bonds

Question 7

Explain the malleability/brittleness/hardness of covalent networks (brittleness)

Answer 7

When a force is applied to a covalent network, they will hold their shape until enough force is applied to overcome and break the strong covalent bonds