C6

Question 1

A student carries out electrolysis on molten sodium chloride. What is produced at the anode and cathode.

Answer 1

Cathode - sodium atoms

Anode - chlorine gas

Question 2

Why can’t an ionic solid be electrolysed?

Answer 2

The ions are in fixed positions and can’t move

Question 3

Positive metal ions are ? to the element of the cathode

Answer 3

Reduced

Question 4

Negative non-metal ions are ? to the element at the anode

Answer 4

Oxidised

Question 5

If a metal is more reactive than carbon, it is reduced with carbon / electrolysis takes place

Answer 5

Electrolysis takes place

Question 6

If a metal is less reactive than carbon, it is reduced with carbon / electrolysis takes place

Answer 6

it is reduced with carbon

Question 7

Cons of electrolysis

Answer 7

Very expensive as lots of energy is required to melt the ore and produce the required current

Question 8

Why os cryolite added to aluminium oxide before electrolysis

Answer 8

Because it has a very high melting point so it lowers the melting point

Saves money and energy