有水参与CaO+H2O===Ca(OH)2
2H2O=(通电)=2H2(气体)+O2(气体)
有水生成2H2+O2=(点燃)=2H2O
HCl+NaOH===H2O+NaCl
NaOH+NH4Cl=(研磨)=NaCl+H2O+NH3(气体)