The battery pulls electrons out of the electrode connected to its [positive/negative] terminal. Because of this, electrons are pulled out of the lead 2+ ions in the around this electrode. This produces lead [2+/4+] ions. Because the lead 2+ ions [gain/lose] electrons as they become lead 4+ ions, [oxidation/reduction] is taking place. This electrode is therefore called the [anode/cathode]. .

In an electrolytic cell, such as this one, the anode is [positively/negatively] charged. This is opposite to the case of a cell. In an electrolytic cell the external power supply (e.g. battery) charges the [?] positively, which forces oxidation to occur there.