Aluminum extraction

Which statement about the uses of aluminium, copper and iron is correct?

• Aluminium is used for aircraft manufacture because it has a high density.

• Aluminium is used for food containers because it is a good conductor of electricity.

• Copper is used for cooking utensils because it is a good conductor of heat.

• Stainless steel is used for car bodies because it corrodes easily.

Iron rusts but aluminium does not easily corrode.

Which statement explains why aluminium does not easily corrode?

• is an alloy.

• it is below iron in the reactivity series

• It is not a transition element.

• Its surface is protected by an oxide layer.

Aluminium metal is extracted from aluminium oxide using electrolysis.

Which statement about the extraction process is not correct?

• A large amount of electricity is required.

• Molten cryolite is used to dissolve the aluminium oxide.

• Oxygen gas is released which reacts to form carbon dioxide

• The negative electrodes burn away and have to be replaced.

what are the anode and cathode made of?

• cathode: aluminum anode: aluminum

• cathode: aluminum anode: graphite

• cathode: graphite anode: aluminum

• cathode: graphite anode: graphite.

Which set of properties help to explain the use of aluminium for cooking and storing food?

• 1

• 2

• 3

• 4

Aluminium is extracted by the electrolysis of aluminium oxide.

Which statement is not correct?

• Aluminium ions are oxidised at the cathode.

• Carbon dioxide is made at the anode.y

• Cryolite is added to lower the melting point of the aluminium oxide.

• The electrodes are made from graphite.