Chemistry 4.2

Question 1

Colour of chlorine at room temperature?

Answer 1

Pale green

Question 2

Colour of fluorine at room temperature?

Answer 2

Pale yellow

Question 3

Colour of bromine at room temperature?

Answer 3

Brown

Question 4

Colour of iodine at room temperature?

Answer 4

Dark grey

Question 5

Colour of astatine at room temperature?

Answer 5

Black

Question 6

List the halogens in order of increasing reactivity

Answer 6

Astatine Iodine Bromine Chlorine Fluorine

Question 7

What is the trend for reactivity amongst the halogens?

Answer 7

As you go down the group, reactivity decreases

Question 8

What is the trend in melting point/ boiling point for the halogens?

Answer 8

As you go down the group, melting point/boiling point increases

Question 9

What is the trend in colour for the halogens?

Answer 9

As you go down the group, colour gets darker

Question 10

Explain why elements further down the group are less reactive

Answer 10

As you go down the group, atomic radius increases. This means the nuclear attraction between negative electrons and the positive nucleus is weaker, making it harder to gain an electron.

Question 11

What is a special characteristic of iodine?

Answer 11

It sublimes to a purple vapour.

Question 12

What is a special characteristic of bromine?

Answer 12

Releases brown fumes, it is volatile.

Question 13

Is the more reactive halogen reduced or oxidised in a halogen displacement reaction?

Answer 13

Reduced, it gains electrons

Question 14

Is the less reactive halogen reduced or oxidised in a halogen displacement reaction?

Answer 14

Oxidised, it loses electrons