Halogens

Question 1

Describe the trend of electronegativity in halogens.

Answer 1

Halogens get less electronegative going down the group.

Question 2

Describe and explain the trend of reactivity in halogens.

Answer 2

Get less reactive down the group. Bigger radius outweighs greater nuclear charge so not as much attraction for valence electrons.

Question 3

Describe the states of fluorine, chlorine, bromine, and iodine at RT.

Answer 3

Fluorine - gas
Chlorine - gas
Bromine - liquid
Iodine - solid

Question 4

Fill in the space:

A more reactive halogen can [ ] a less reactive halogen.

Answer 4

Displace.

Question 5

Describe the appearances of F, Cl, Br, and I.

Answer 5

F - light yellow gas
Cl - Greenish-yellow gas
Br - reddish-brown liquid
I - Purple-black solid

Question 6

Describe and explain the trend of acidity in hydrogen halides.

Answer 6

Gets more acid down the group because less reactive halides can give away H+ ions more readily.

Question 7

Colour of silver iodide ppt

Answer 7

Pale yellow.

Question 8

Colour of silver bromide ppt

Answer 8

Pale cream.

Question 9

Colour of silver chloride ppt

Answer 9

White ppt.

Question 10

What is bleach and how is it made?

Answer 10

An equal mixture of NaCl and NaClO, formed from the reaction of chlorine in a COLD alkali.

Question 11

Describe what is meant by a disproportionation reaction.

Answer 11

Part of a compound is oxidised and part is reduced.