两两发生反应的化学方程式如下：
1.Zn+2H2O =加热= Zn(OH)2+H2↑
2.CaO + H2O = Ca(OH)2
3.Zn + 2HCl= ZnCl2 + H2↑
4.Zn + CuSO4 = ZnSO4 + Cu
5.Na2CO3 + Ca(OH)2 = 2NaOH + CaCO3↓
6.Na2CO3+2HCl=2NaCl+H2O+CO2↑
Na2CO3 + HCl=NaCl+NaHCO3
7.Na2CO3 + CuSO4 = CuCO3↓ + Na2SO4
8.Ca(OH)2 + 2HCl = CaCl2 + 2H2O
9.Ca(OH)2 + CuSO4 = CaSO4 + Cu(OH)2↓
10.CaO + 2HCl = CaCl2 + H2O