Question

Ca=CaCl2=CaO=Ca(OH)2=CaCO3=CaO

Answer 1

Ca+2Hcl=CaCl2+h2

CaCl2+H20=Ca0+2hcl

CaO+H2=Ca(OH)2

Ca(OH)2+K2C03=CaCo3+2KOH

CaCO3+H2O=CaO+H2CO3

Answer 2

СA + CL2->CaCL2

2CaCL2 + O2 -> 2Cao + 2Cl2

CAO + H20 -> CA(OH)2 

CA(OH)2 + H2CO3 -> CACO3 2H20

CACO3 +  -> CaO + CO2