Chapter 6

Question 1

Electrolyte

Answer 1

The compound that is broken down by electrolysis

Question 2

Anode

Answer 2

Positive

Question 3

Cathode

Answer 3

Negative

Question 4

Electrodes

Answer 4

Made out of graphite - unreactive, can conduct electricity

Question 5

Electrolysis

Answer 5

The electrolyte is put into the solution
The electrodes are connected to a power source, which is then turned on
The ions will be attracted to the electrode with the opposite charge
The less reactive element will be discharged at the electrode if there are multiple options
OR (for aqueous solutions)
At cathode: Water
At anode: Halide ion THEN Hydroxide THEN all other negatively charged ions

Question 6

RedOx in electolysis

Answer 6

Reduced at cathode
Oxidised at anode

Question 7

Electrolysis of aluminium

Answer 7

Once purified, the aluminium must be melted
Aluminium has a very high melting point, so has to be mixed with cryolite to reduce this melting point