Group 7

Question 1

State and colour of chlorine at room temperature

Answer 1

Green/yellow gas

Question 2

How does chlorine react with damp litmus paper?

Answer 2

Chlorine bleaches damp litmus paper.

Question 3

State and colour of bromine at room temperature

Answer 3

Bromine is a brown liquid at room temperature

Question 4

Iodine state and colour at room temperature

Answer 4

Grey solid

Question 5

What happens to iodine when it is heated?

Answer 5

It sublimes to give purple fumes?

Question 6

As you go down group 7, the boiling point of the halogens …

Answer 6

Increases

Question 7

As you go down group 7, the colour of the halogens becomes ….

Answer 7

Darker

Question 8

What is the trend in reactivity for group 7?

Answer 8

The halogens become less reactive as you go down the group

Question 9

Explain the trend in reactivity for group 7.

Answer 9

• as you go down the group, the number of outer shells that the halogens have increases.
• this makes it harder for the halogen to gain 1 electron because there is a weaker force of attraction between the electron and the nucleus.
• therefore halogens get less reactive down the group.

Question 10

Colour of chlorine in aqueous solution.

Answer 10

Pale yellow

Question 11

Colour of bromine in an aqueous solution

Answer 11

Orange

Question 12

Colour of iodine in aqueous solution

Answer 12

Red brown

Question 13

why does the boiling point of the halogens increase as you go down the group?

Answer 13

the molecules become larger so the intermolecular forces become stronger.