Zn+S=ZnS
ZnS+O2=ZnO+SO2
ZnO+HCl=ZnCl2+H2O
ZnCl2+KOH=Zn(OH)2+KCl
Zn(OH)2=ZnO+H2O
Ca+O2=CaO
CaO+H2O=Ca(OH)2
Ca(OH)2=CaO+H2O
CaO+HNO3=Ca(NO3)2+H2O
Ca(NO3)2+H2SO4=HNO3+CaSO4
Fe+O2=FeO
не знаю
Fe(OH)2+HCl=FeCl2+H2O
не знаю
FeCl3+KOH=Fe(OH)3+KCl
Fe(OH)3=Fe2O3+H2O