Si+4 O2-2 + 4H+1 F -1 => Si +4 F 4 -1 + 2H +1O-2
Zn0 +Cu+2 SO4 -2 => Zn+2 So4-2 + Cu0
Na+1 OH-1 + H+1 Cl-1 => Na+1 Cl -1 + H2 +1 O -2
Si+4 O2-2 + 4H+1 F -1 => Si +4 F 4 -1 + 2H +1O-2
Zn0 +Cu+2 SO4 -2 => Zn+2 So4-2 + Cu0
Na+1 OH-1 + H+1 Cl-1 => Na+1 Cl -1 + H2 +1 O -2