GCSE Chemistry - Electrolysis P2 - Electrolysis to Extract Metals From Oxides - Explained #41

The video tutorial explains the process of using electrolysis to extract reactive metals from their oxides. It covers the challenges of melting aluminium oxide, the setup of electrolysis equipment, and the reactions at the electrodes. The tutorial also discusses the equations involved in the process and the concepts of oxidation and reduction, using the mnemonic 'oil rig' to help remember these concepts.

What is the primary reason electrolysis is used instead of carbon reduction for extracting certain metals?

• Electrolysis is cheaper than carbon reduction.

• Electrolysis is used for metals more reactive than carbon.

• Carbon reduction is more energy-intensive.

• Electrolysis produces less waste.

Why is cryolite added to aluminium oxide before electrolysis?

• To make the mixture more reactive.

• To increase the melting point.

• To purify the aluminium oxide.

• To lower the melting point.

What is the role of the anode in the electrolysis of aluminium oxide?

• To attract aluminium ions.

• To donate electrons to oxygen ions.

• To attract oxygen ions.

• To provide a source of carbon.

What is the purpose of the cathode in the electrolysis process?

• To attract oxygen ions.

• To donate electrons to aluminium ions.

• To increase the temperature of the electrolyte.

• To provide a source of carbon.

During electrolysis, what happens to the oxygen ions at the anode?

• They gain electrons and form oxygen gas.

• They remain unchanged.

• They lose electrons and form oxygen gas.

• They combine with aluminium ions.

What mnemonic can help remember the process of oxidation and reduction?

• AN OX

• RED CAT

• OIL RIG

• LEO the lion says GER

What is the overall balanced equation for the electrolysis of aluminium oxide?

• Al2O3 (l) → 2Al (l) + 3O2 (g)

• 2Al2O3 (l) → 4Al (l) + 2O2 (g)

• 2Al2O3 (l) → 4Al (l) + 3O2 (g)

• Al2O3 (s) → 2Al (s) + 3O2 (g)