Electrolysis of ionic compounds Flashcards
where will + metal ions go in electrolysis
cathode
what do + metal ions gain at cathode
electrons
what do + metal ions form at cathode
metal atoms
where do - non metal ions go
(electrolysis)
anode
what do - non metal ions lose at anode
electrons
what do - non metal ions form at positive electrode
non metal ions
what usually happens to non metal atoms at anode
join by covalent bonds and form simple molecules
where do the metals always form
cathode
where do the non metals always form
anode
e.g lithium chloride
(electrolysis)
lithium —> cathode
chloride —> anode
aqueous solutions at the anode
if the negative ion is not in group 7 the OH- ion takes it place
aqueous solution at the cathode
if the positive ion is in group 1 then the H+ ion takes its place
why is aluminium oxide electrolysis different
it dissolves in cryolite to lower the melting point
