Проставьте степени окисления SiO2+4HF=SiF4+2H2O Zn+CuSO4=ZnSO4+Cu NaOH+HCI=NaCI+H2O
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
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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