Electrolysis

Question 1

Describe what happens during the electrolysis of lead(II) bromide

Answer 1

Substance is heated, the ionic bonds break and they ions are free to move
The positively charged lead ions will attract to the negative cathode
The negatively charged bromide ions will be attracted to the positive anode
Bromine gas is then released

Question 2

State a possible electrode material and describe why it is useful

Answer 2

Graphite, as it is inert

Question 3

What are positively charged ions called

Answer 3

Cations

Question 4

What are negatively charged ions called

Answer 4

Anions

Question 5

What is electrolysis

Answer 5

Using electrolysis to break down an ionic compound

Question 6

What is oxidation

Answer 6

Loss of electrons

Question 7

What is reduction

Answer 7

Gain of electrons

Question 8

Describe the process of electrolysis of aqueous solutions

Answer 8

Hydrogen and hydroxide ions are present
Hydroxide ions are attracted to the anode and transformed into water and oxygen

Question 9

How do you know which ions will undergo change

Answer 9

If the metal is less reactive than hydrogen, it will be formed

Question 10

How can you predict the products at the anode

Answer 10

If halides are present, they will be oxidised
If not, hydroxide will be oxidised