(1)CaO +H 2O= Ca(OH) 2等 (2) H 2CO 3= H 2O+ CO 2↑等
(3)H 2SO 4+Zn=ZnSO 4+ H 2↑等 (4)2HCl + CaCO 3=CO 2↑+ CaCl 2+ H 2O等