Fe: +3Fe - 3e- -> Fe3+Br: 0Br2 + 6e- -> 2Br-
Zn: +2Zn - 2e- -> Zn2+O: -2O2 + 4e- -> 2O2-
Pb: +2PbO + 2H+ + 2e- -> Pb + H2O
Fe: +3
Fe - 3e- -> Fe3+
Br: 0
Br2 + 6e- -> 2Br-
Zn: +2
Zn - 2e- -> Zn2+
O: -2
O2 + 4e- -> 2O2-
Pb: +2
PbO + 2H+ + 2e- -> Pb + H2O