Just to clarify, in the reactions you provided:

1) Na2O + H2O = 2NaOH $Sodiumoxidereactswithwatertoformsodiumhydroxide$ 2) 2NaOH + Cu$OH$2 = Na2$$Cu(OH)4$$ $Sodiumhydroxidereactswithcopperhydroxidetoformsodiumtetrahydroxocuprate$ 3) Cu$OH$2 + H2SO4 = CuSO4 + 2H2O $Copperhydroxidereactswithsulfuricacidtoformcoppersulfateandwater$ 4) NaOH + HCl = NaCl + H2O $Sodiumhydroxidereactswithhydrochloricacidtoformsodiumchlorideandwater$ 5) Cu$OH$2 = CuO + H2O $Copperhydroxidedecomposestoformcopper(II)oxideandwater$ 6) CuO + H2SO4 = CuSO4 + H2O $Copper(II)oxidereactswithsulfuricacidtoformcoppersulfateandwater$