Group 7 - The Halogens

Question 1

Physical properties of the halogens

Answer 1

• Non metals
• Each halogen contains 2 atoms joined by a single covalent bond
• Melting and boiling points increase going down the group

Question 2

What is the colour of bromine at room temperature?

Answer 2

• Brown

- Liquid

Question 3

What is the colour of chlorine at room temperature?

Answer 3

• Pale green

- Gas

Question 4

What is the colour of iodine at room temperature?

Answer 4

• Purple black

- Solid

Question 5

Why do the melting and boiling point increase when going down the group?

Answer 5

• The molecules become larger
• The inter-molecule forces become stronger
• More energy is needed to overcome these forces

Question 6

Chemical properties of the halogens

Answer 6

• Have 7 outer electrons in their outer shell

- Become less reactive when going down the group

Question 7

When halogens react with metal, what do they produce?

Answer 7

Salt

Question 8

What happens when Florine reacts with metal, what happens?

Answer 8

Cold iron wool burns to produce white iron fluoride

Question 9

When Chlorine reacts with metal, what happens?

Answer 9

Hot iron wool burns vigorously to produce orange-brown iron chloride

Question 10

When Bromine reacts with metal, what happens?

Answer 10

Hot iron wool burns quickly to produce red-brown iron bromide

Question 11

When Iodine reacts with metal, what happens?

Answer 11

Hot iron wool reacts slowly in iodine vapour to produce grey iron iodide