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Egalati ecuatiile reactiilor:
Al + HCl -> AlCl3 + H2
Zn + HCl -> Zn+H2
Ca + H2O -> Ca(OH)2 + H2
Ca + O2 -> CaO


Răspuns :

2Al  +  6HCl---> 2AlCl3 + 3H2
Zn + 2HCl-----> ZnCl2 + H2
Ca+ 2H2O----> Ca(OH)2 + H2
2Ca + O2--> 2CaO
HCl + NaOH----> NaCl + H2O
Al + 3 HCl = AlCl3 + 3/2 H2
Zn + 2 HCl = ZnCl2 + H2
Ca + 2 H2O = Ca(OH)2 + H2
Ca + 1/2 O2 = CaO
NaOH + HCl = NaCl + H2O