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what is special about the cathode for extracting Al?

why does the Al have to be molten?

positive Al ions are attracted to the _______ charged _______, where they pick up ______ and turn in Al ______.

where do the Al go after it has been turned into atoms?

what happens to the oxygen ions?

what gas(es) are produced at the anode and why does it need to be replaced?

Overall it is a _______ reaction because both _______ and ________ take place.

what are the reactions at both electrodes ?