electrolysis Flashcards
when can an ionic compound conduct electricity
when melted or dissolved
what is an electrolyte
a liquid or solution that is able to conduct electricity
what happens when an electric current is passed through an electrolyte
the ions move to the electrodes
what is a cathode
negative electrode
what is an anode
positive electrode
which electrode are positive ions attracted to
negative electrode
which electrode are negative ions attracted to
positive electrode
what happens at the electrode
the ions are discharged at the electrodes prodcuing elements
what happens ehen a simple ionic compound is electrolysed
the metal forms at the cathode and the non metal is produced at the anode
when is the electrolyis used to extract metals
when the metal is too reactive to be extracted by reduction with carbon or if the metal reacts with carbon
what are the problems pf using electrolysis to extract metals
large amounts of energy needed to meltt the compound and produce electical current
how is aluminium extracted using electrolyiss
melted and mized with cryolite, aluminium ions move to the negative electrode and the oxygen ions move to the postivie electrode to react with the carbon electrode to make carbon dioxide
why is a mixture used as the electrode for the extraction of aluminium
the cryolited lowers the melting point of aluminium oxide
why must the postive electrode be replaced dyring the electrolyisis of aluminium
the oxygen reacta with the carbon in the electrode burning it away
during the electrolysis of an aq what does the ion discharged at the electrode depend on
the reactivity of the elements involved
