3AgNO3+Al=3Ag+Al(NO3)3
Ag(+)+1e=Ag(0)
Al(0)-3e=Al(+3)
4Fe(OH)2+O2+2H2O=4Fe(OH)3
Fe(+2)-1e=Fe(+3)
O2(0)+4e=2O(-2)
2Cu(NO3)2=2CuO+4NO2+O2
N(+5)+1e=N(+4)
2O(-)-4e=O2(0)
2Fe+3Cl2=2FeCl3
Fe(0)-3e=Fe(+3)
Cl2(0)+2e=2Cl(-)
3Mg+2P=Mg3P2
Mg(0)-2e=Mg(+2)
P(0)+3e=P(-3)