extraction of aluminium

What is the name of the ore that contains aluminum

• Bauxite

• Cryolite

• Aluminum oxide

Which is not a reason that cryolite is used in aluminum extraction?

• Cryolite dissolves aluminum oxide

• Cryolite reduces the melting point of aluminum oxide

• Cryolite decreases the cost of aluminum extraction

• Cryolite removes impurities from aluminum oxide

The positive electrode is called the

• anode

• cathode

The negative electrode is called the

• anode

• cathode

Aluminum ions are attracted to the

• anode

• cathode

Oxygen ions are attracted to the

• cathode

• anode

In aluminum extraction the electrodes are made of

• carbon (graphite)

• aluminum and oxygen

• platinum

The anode has to be replaced because

• The oxygen reacts with the carbon anode to form carbon dioxide

• Aluminum reacts with the carbon to form aluminum carbide

• The anode gets impurities that impact the extraction

Which answer is not the reason why cathode is located at the bottom of the electrolytic cell?

• so that the bubbles produced will not be trapped in the molten aluminium

• so that molten aluminium can be collected easily

• to prevent oxygen contact with molten aluminium

• because it is easier to attract heavier ions at the bottom

In the extraction of aluminium by electrolysis of molten aluminium oxide ore, the ore is dissolved in cryolite to?

• to decompose the ore into aluminium and oxygen at a higher temperature

• to help keep the aluminium molten at a higher temperature

• lower the melting point of the aluminium ore to reduce the temperature of the process

• to help stop the electrodes from corroding away at high temperature