K+O2=KO2
Mg+2H2O=H2+Mg(OH)2
3Pb+8HNO3=4H2O+2NO+3Pb(NO3)2
Fe+CuCl2=Cu+FeCl2
4Zn+5H2SO4=4H2O+H2S+4ZnSO4
Zn+H2SO4=ZnSO4+H2
K+O2=KO2
Mg+2H2O=H2+Mg(OH)2
3Pb+8HNO3=4H2O+2NO+3Pb(NO3)2
Fe+CuCl2=Cu+FeCl2
4Zn+5H2SO4=4H2O+H2S+4ZnSO4
Zn+H2SO4=ZnSO4+H2