Electrolysis - Turning IONS into the Atoms You Want

Question 1

Molten aluminium oxide contains free ions, so it’ll…

Answer 1

Conduct electricity

Question 2

What are the positive Al3+ ions attracted to?

Answer 2

The negative electrode where they pick up electrons and ‘zup’, they turn into aluminium oxides - then sink to bottom

Question 3

What are the negative O2- ions attracted to?

Answer 3

The positive electrode where they lose electrons - react together to from O2 or with the carbon anode as well to from CO2

Question 4

Why does the positive carbon electrode often need replacing?

Answer 4

It is constantly getting worn down by reacting with oxygen

Question 5

What kind of a reaction is this overall?

Answer 5

A redox reaction

Question 6

At the negative electrode (cathode):

Answer 6

Al3+ + 3e- —> Al

Question 7

At the positive electrode (anode):

Answer 7

2O2 —> O2 + 4e-

Oxidation - loss of electrons

Question 8

What is the complete equation for the decomposition of aluminium oxide?

Answer 8

Aluminium oxide —> aluminium + oxygen