а)Ca + O2 = CaOCaO + H2O = Ca(OH)2Ca(OH)2 + 2HCl = CaCl2 + 2H2O
б)CuO + 2HCl = CuCl2 + H2OCuCl2 + 2NaOH = Cu(OH)2 + 2NaClCu(OH)2 + H2SO4 = CuSO4 + 2H2O
а)
Ca + O2 = CaO
CaO + H2O = Ca(OH)2
Ca(OH)2 + 2HCl = CaCl2 + 2H2O
б)
CuO + 2HCl = CuCl2 + H2O
CuCl2 + 2NaOH = Cu(OH)2 + 2NaCl
Cu(OH)2 + H2SO4 = CuSO4 + 2H2O