What is one of the main costs associated with using electrolysis to extract metals?

• Low labor costs

• High cost of heat energy

• Low cost of raw materials

• High cost of water

What is one benefit of using carbon reduction over electrolysis?

• It is more environmentally friendly.

• It is more cost-effective.

What is the main ore of aluminium?

• Hematite

• Galena

• Bauxite

• Magnetite

What happens to oxide ions during the electrolysis process?

• They gain electrons

• They lose electrons

• They remain unchanged

• They form aluminium

What is the role of the heat resistant material in the diagram?

• To conduct electricity

• To prevent heat loss

• To act as a cathode

• To insulate the anodes

Why does molten aluminium sink to the bottom of the cell?

• It is less dense than the electrolyte.

• It is more dense than the electrolyte.

• It reacts with the electrolyte.

• It is attracted to the anode.

What is the function of the anode in the electrolysis of aluminium?

• It is the negative electrode.

• It is where aluminium ions are reduced.

• It is the positive electrode.

• It is where aluminium oxide is mixed with cryolite.

What is the main product formed at the anode during the electrolysis of aluminium?

• Oxygen gas

• Aluminium metal

• Carbon dioxide

• Water

Which method is used to extract magnesium?

• Electrolysis

• Heating with carbon

• None

• Filtration

Which of the following metals is extracted using electrolysis?

• Magnesium

• Iron

• Copper

• Zinc