GCSE CS Trilogy - Chemistry - Structure and Bonding

Question 1

Explain as fully as you can why Ionic compounds have a high melting point. (3)

Answer 1

Strong electrostatic attraction between positive and negative ions (1)
Giant Ionic lattice (1)
High energy required to break the bonds between ions (1)

Question 2

In what state of matter can Ionic compounds conduct electricity and why? (2)

Answer 2

Liquid - Ions are able to move and carry a charge

Question 3

Explain as fully as you can why metallic compounds have a high melting point. (3)

Answer 3

Strong electrostatic attraction (1)
Giant metallic lattice (1)
High energy needed to break bonds (1)

Question 4

Explain why metallic compounds can conduct electricity. (2)

Answer 4

The metal contains de-localised electrons (1)
That can move and carry a charge (1)

Question 5

Explain why a metallic compound is malleable. (2)

Answer 5

Layers of ions can slide over each other, causing the metal to bend. (2)

Question 6

Explain why diamond has a high melting point. (3)

Answer 6

4 strong covalent bonds between each carbon atom (1)
Giant covalent lattice (1)
High energy needed to break bonds (1)

Question 7

Part A - Is diamond able to carry a charge?
Part B - Explain why this is the case.

Answer 7

Part A - No
Part B - No electrons able to move so they can’t carry a charge

Question 8

Explain as fully as you can why diamond is hard. (2)

Answer 8

Giant covalent lattice (1)
4 strong covalent bonds between each carbon atom (1)

Question 9

Explain as fully as you can why graphite has a high melting point. (3)

Answer 9

3 strong covalent bonds between each carbon atom (1)
Giant Lattice (1)
Hugh energy needed to break bonds (1)

Question 10

Explain why graphite can conduct electricity. (2)

Answer 10

Graphite has de-localised electrons (1)
That can move and carry a charge (1)

Question 11

Explain why graphite is soft. (2)

Answer 11

Weak intermolecular forces between layers (1)
Layers can slide over each other (1)

Question 12

Explain why simple covalent structures have a low melting point. (3)

Answer 12

Simple covalent molecule (1)
Weak intermolecular focus between layers (1)
Low energy needed to break forces (1)

Question 13

Explain why simple covalent structures can’t carry a charge. (2)

Answer 13

No electrons or ions to carry a charge (2)