The extraction of aluminium Flashcards
(3 cards)
1
Q
does aluminium have a high or low melting point
A
high
2
Q
how do you lower the melting point of aluminium
A
molten aluminium with molten cryolite
3
Q
why do the carbon anodes need to be replaced
A
the oxygen reacts with hot carbon anodes to form carbon dioxide gas
this means that the carbon anodes gradually burn away and need to be replaced
