WorksheetsProduction of aluminium
Total questions: 20
Worksheet time: 6mins
What is an ore?
rock
rock with enough mineral to be worth extracting
solid metal
an object used to row a boat
What is the name of the ore that contains aluminum
Bauxite
Cryolite
Aluminum oxide
Heamatite
What is the white powder?
Ground aluminium
Bauxite
Alumina
Limestone
Aluminium oxide is
soluble in water
a covalent compound with ionic character.
amphoteric in nature.
reactive towards most acid.
What is the name of the process for making alumina?
Bayer
Hall-Heroult
What happens at the beginning of the Bayer Process?
Alumina is dissolved in cryolite
Crushed bauxite ore is dissolved in hot concentrated NaOH to remove impurities.
Aluminium hydroxide is heated to remove water
Filtration
What happens at the end of the Bayer Process?
Alumina is dissolved in cryolite
Crushed bauxite ore is dissolved in hot concentrated NaOH to remove impurities.
Aluminium hydroxide is heated to remove water
Filtration
What is the melting point of alumina?
10 degrees C
100 degrees C
1000 degrees C
Over 2000 degrees C
What is the name of the process for making aluminium?
Bayer
Hall-Heroult
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
In electrolysis, why is it important that the alumina is dissolved first?
So the ions are charged
So the ions are free to move
So the ions are in water
So the ions are all +3
The positive electrode is called the
anode
cathode
The negative electrode is called the
anode
cathode
Aluminum ions are attracted to the
anode
cathode
Oxide ions are attracted to the
cathode
anode
Which of these is a problem in the electrolysis of aluminium oxide?
cathode needs frequent replacement
cryolite is expensive
a lot of heat and electrical energy is required
anode needs frequent replacement
In aluminum extraction the electrodes are made of
carbon (graphite)
aluminum and oxygen
platinum
steel
The anode has to be replaced frequently 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
The anode is too hot and it will reduce their electrical conductivity
