Giant Covalent

Question 0

Diagram example of graphite

Answer 0

See sheet

Question 1

Definition of Giant covalent

Answer 1

• sharing of a pair of electrons between two atoms

- strong attraction between the bonding pair of electrons and the nuclei of atoms involved in bond

Question 2

Examples of giant covalent

Answer 2

Non metals:
Elements- C- graphite, diamond
Compounds-SiO2

Question 3

Diagram of diamond

Answer 3

See sheet

Question 4

Melting and boiling points giant covalent

Answer 4

Very high melting and boiling points due to strong covalent bonds which require lots of energy to break

Question 5

Conductivity giant covalent

Answer 5

Do not conduct electricity due to no free electrons or ions.

EXCEPTION: graphite only has three bonds per carbon; therefore delocalised electrons are available to carry charge

Question 6

Solubility in water giant covalent

Answer 6

Generally insoluble

Question 7

Diagram example of solid liquid gas giant covalent

Answer 7

See sheet

Liquid- bonds start breaking

Question 8

Uses of graphite

Answer 8

• lubricant and pencil lead: layers slide over each other -each carbon atom in a layer is joined to only three other carbon atoms, weak intermolecular forces between layers
• electrodes- conducts electricity
• crucible for holding molten metal- v.high melting point

Question 9

Uses of diamond

Answer 9

Insulating material: doesn’t conduct electricity- forms 4 covalent bonds with other atoms- all outer shell electrons involved in bonding

Cutting tools and drills-hardest material known- each carbon joined to four other carbon atoms

Jewellery- v.high melting pony