C6 Electrolysis Flashcards
what electrode is negative
cathode
what electrode is positive
anode
in electrolysis of an an aqueous solution what will form at the anode if the solution contains a halide
the halide
in electrolysis of an an aqueous solution what will form at the anode if the solution DOESNT contains a halide
oxygen
in electrolysis of an an aqueous solution what will form at the cathode if the solution contains a metal LESS reactive then hydrogen
the metal that’s less reactive then hydrogen (copper)
in electrolysis of an an aqueous solution what will form at the cathode if the solution contains a metal MORE reactive then hydrogen
hydrogen
what’s mixed with aluminium oxide during electrolysis to lower the melting point
cryolite
what occurs at the anode oxidation or reduction
oxidation- electrons are lost
what occurs at the cathode oxidation or reduction
reduction- electrons are gained
what’s the half equation at the cathode when hydrogen is produced
2H+ + 2e- -> H2
what’s the half equation at the anode when hydroxide ions are electrolysed
4 OH- —> 2 H2O + O2 + 4 e-