Extraction of Aluminium Using Electrolysis

Why is Aluminium expensive? (2 answers)

• The process takes a lot of electricity

• Aluminium is rare

• The electrodes need to be replaced often

• The mines are deep

What is Aluminium extracted from?

• Aluminium oxide, Al₂O₃

• Carbon Dioxide, CO₂

• Methane, CH₄

• Silicon Dioxide, SiO₂

During electrolysis, what will the Aluminium Oxide split into?

• Al³⁺ and O^2-

• Al and O

• Al⁺ and O^-

• Aluminium and Oxide

Which ion will be attracted to the negative electrode (cathode)?

• Al³⁺

• O^2-

• Na⁺

• H⁺

Which ion will be attracted to the positive electrode (anode)?

• Al³⁺

• O^2-

• H⁺

• All of them

When the Oxygen ion arrives at the graphite (Carbon) anode, what gas will it form?

• CO₂

• H₂O

• H₂

• O₂

The positive Aluminium ions gain electrons, so they are ____?

(use OILRIG)

• Oxidised

• Reduced

• Oxygenated

• Riddled

The negative Oxygen ions lose electrons, so they are ____?

(use OILRIG)

• Oxidised

• Reduced

• Oxygenated

• Rangled