Ответ:

Ca+O2=CaO

CaO+H2O=Ca(OH)2

Ca(OH)2+HCl=CaCl2+HOH

 

Zn+HCl=ZnCl2+H2

ZnCl2+NaOH=Zn(OH)2+NaCl

Zn(OH)2=ZnO+H2O