The chemical reactions between Fe(OH)2 (Iron(II) hydroxide) and the different reagents are as follows:

Fe(OH)2 + Cu -> Fe + Cu(OH)2

Fe(OH)2 + CaO -> FeO + Ca(OH)2

Fe(OH)2 + HCl -> FeCl2 + 2H2O

Fe(OH)2 + K2SO4 -> FeSO4 + 2KOH

Fe(OH)2 + H2SO4 -> FeSO4 + 2H2O

Please note that these are general chemical equations and the actual reactions may involve different stoichiometries or products depending on the reaction conditions.