FC14

Question 1

What is the colour and state at RTP, the colour in non polar solvent and colour in Aquarius solution for Fluorine

Answer 1

Pale yellow in colour and state at RTP

None in colour in non polar solvent

None in colour in aqueous solution

Question 2

What is the colour and state at RTP, the colour in non polar solvent and colour in Aquarius solution for Chlorine

Answer 2

Pale green gas colour and state at RTP

Pale green colour in non polar solvent

Very pale green colour in aqueous solution

Question 3

What is the colour and state at RTP, the colour in non polar solvent and colour in Aquarius solution for bromine

Answer 3

Volatile red brown liquid colour and state at RTP

Orange colour in non polar solvent

Pale orange / yellow if dilute colour in aqueous solution

Question 4

What is the colour and state at RTP, the colour in non polar solvent and colour in Aquarius solution for iodine

Answer 4

Shiny grey black solid colour and state at RTP

Violet colour in non polar solvent

Brown / yellow if dilute colour in aqueous solution

Question 5

Explain in terms of atomic structure why fluorine is more potent oxidising agent that bromine

Answer 5

Going down Group 7 the atoms of the halogens have greater nuclear charge and more shells of e’s. The greater shielding outweighs the greater nuclear. So the ability for the nucleus to attract an e from another species decreases. Therefore the oxidise ability of the halogens decreases.

Question 6

What happens when a halogen is added to a halide

Answer 6

More reactive/oxidising halogen displaces a less reactive/oxidising one from the halide/compound

Question 7

Why is chlorine added to drinking water and swimming pools

Answer 7

To kill bacteria as a water treatment

Question 8

Why do some people oppose to having chlorine added to drinking water

Answer 8

Chlorine is toxic
Chlorine reacts with organic compounds dissolved in water to form organochlorides, which are carcinogenic