III metoda:H2CO3 + CaO --> CaCO3 + H2O2HCl + MgO ---> MgCl2 + H2O2H3PO4 + 3CaO ---> Ca3(PO4)2 + 3H2OH2S + CuO ---> CuS + H2OIV metoda:Mg + Cl2 ---> MgCl2Cu + S ---> CuS
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III metoda:
H2CO3 + CaO --> CaCO3 + H2O
2HCl + MgO ---> MgCl2 + H2O
2H3PO4 + 3CaO ---> Ca3(PO4)2 + 3H2O
H2S + CuO ---> CuS + H2O
IV metoda:
Mg + Cl2 ---> MgCl2
Cu + S ---> CuS