electrolysis. Flashcards
what can be done to electrical decomposition of ionic compounds?
metal extraction, electroplating, chlor-alkali process.
why can ionic compounds not conduct electricity when solid in state?
ions can’t move.
what are the 2 charges of electrodes called and what are there charges?
positive electrode- anode.
negative electrode - cathode.
what happens to ions at the positive electrode and what process does it undergo?
loose electrons.
oxidation.
what happens at the negative electrode, why and what process does it undergo?
gain electrons- to loose charge.
reduction.
why is cryolite added to the bauxite (aluminium oxide?)
to reduce melting point.
explain why the graphite anodes need to be replaced regularly?
oxygen made reacts with the graphite to form carbon dioxide gas.
what is produced if a metal is more reactive than hydrogen?
makes hydrogen.
what is made when a metal is less reactive than hydrogen?
makes metal.
