Halogen Identification

Question 1

What colour is chlorine in water

Answer 1

Pale green

Question 2

What colour is bromine water

Answer 2

Orange

Question 3

What colour is iodine water

Answer 3

Brown

Question 4

What non polar solvent do you add to differentiate between iodine and bromine?

Answer 4

Cyclohexane

Question 5

What colour does the top layer of chlorine go?

Answer 5

Green

Question 6

What colour does the top layer of bromine go?

Answer 6

Orange

Question 7

What colour does the top layer of iodine go?

Answer 7

Violet

Question 8

What is added to halide solutions to test for them?

Answer 8

Dissolved in nitric acid then silver nitrate is added dropwise

Question 9

Why is nitric acid used?

Answer 9

To prevent fake positives from carbonate ions

Question 10

What colour does AgCl go?

Answer 10

White precipitate

Question 11

What colour is AgBr?

Answer 11

Cream precipitate

Question 12

What colour is AgI?

Answer 12

Yellow precipitate

Question 13

If we add dilute ammonia to these solutions, which halide dissolves?

Answer 13

Chlorine

Question 14

If we add concentrated ammonia, which halide dissolves?

Answer 14

Bromine

Question 15

How are halide solutions provided?

Answer 15

Via salt solutions

Question 16

What is disproportionating?

Answer 16

When the same element or compound in a reaction in oxidised and reduced

Question 17

Cl2 + NaOH —> NaClO + NaCl + H2O
What reaction is this

Answer 17

The making of bleach

Question 18

Cl2 + H2O —-> HClO + HCl
What reaction is this?

Answer 18

Water purification

Question 19

What is a pro of water purification

Answer 19

Kills bacteria

Question 20

What are two negatives of water purification?

Answer 20

-toxic gas and respiratory irritant
- forms carcinogenic chlorinated hydrocarbons

Question 21

How do you test for the presence of ammonia ion?

Answer 21

Add NaOH and gently warm, then hold damp red litmus paper over the test and it will go blue in the presence of ammonia ions