Electrolysis of aluminium content and vocab quiz Trilogy

What is electrolysis?

• The process of cooling metals rapidly

• The combination of metals with oxygen

• The decomposition of a compound using an electric current

• The process of heating metals to high temperatures

What is the main reason aluminium extraction is expensive?

• The high cost of graphite electrodes

• The high cost of bauxite

• The high melting point of aluminium oxide

• The high cost of cryolite

What is bauxite?

• A type of metal

• A rock that can be used to make aluminium

• A chemical compound

• A type of electrode

What happens to aluminium ions during electrolysis?

• They gain electrons at the cathode

• They remain unchanged

• They lose electrons at the cathode

• They gain electrons at the anode

What is formed at the anode during the electrolysis of aluminium oxide?

• Carbon dioxide

• Cryolite

• Oxygen molecules

• Aluminium metal

Why must the positive electrodes in aluminium extraction be replaced frequently?

• They are consumed by the aluminium ions

• They melt at high temperatures

• They react with oxygen to form carbon dioxide

• They dissolve in the molten cryolite

What is cryolite used for in the extraction of aluminium?

• To increase the melting point of aluminium oxide

• To lower the melting point of aluminium oxide

• To act as a catalyst

• To provide additional aluminium ions

What is bioleaching?

• Using water to wash metals from ores

• Using heat to extract metals from ores

• Using plants to absorb metals from the soil

• Using bacteria to extract metals from their ores

What is an ore?

• A type of electrode

• A chemical compound

• A rock containing enough quantities of a mineral for extraction

• A pure metal

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

• It reacts with aluminium ions

• It acts as a solvent

• It forms the electrodes

• It reduces the melting point