2.2 dau funda si 15 puncte urgentttt

Zn + 2HCl = ZnCl2 + H2
Ca + 2H 2O= Ca(OH)2 + H2
CuSO4 + 2NaOH = Cu(OH )2 +Na2SO4
4Al +3 O2 = 2Al2O3