10.2

Question 1

what is an oxidising agent?

Answer 1

Oxidising agents are substances that oxidise other species, gain electrons and are themselves reduced

Question 2

what is the trend in oxidisation in group 7 elements?

Answer 2

the oxidisation ability of the halogens decreases as you go down the group because the number of shells increases as you go down the group.

Question 3

what is a displacement reaction?

give an example.

Answer 3

A reaction in which a halide in a compound can be displaced by a more reactive halogen

For example, the addition of chlorine water to a solution of sodium bromide:

Cl2 (aq) + 2NaBr (aq) → 2NaCl (aq) + Br2 (aq)

The chlorine has displaced the bromide from the solution as it is more reactive
The ionic equation for the reaction is:

Cl2 (aq) + 2Br- (aq) → 2Cl- (aq) + Br2 (aq)

Bromine has been oxidised
The oxidation state of bromine has increased from -1 to 0

The chlorine has been reduced
The oxidation state of chlorine has decreased from 0 to -1
Chlorine acts as an oxidising agent

Question 4

why can’t fluorine be tested in an aqueous solution?

Answer 4

Fluorine is so volatile it can react with water.