ЦЕПОЧКИ ПРЕВРАЩЕНИЙ:
а) Ca--->CaO-->Ca(OH)2-->Ca(NO3)2-->CaSO4
б) Al2O3-->Al2(SO4)3-->Al(OH)3-->Al2O3
г)Cu-->CuO-->CuCl2-->Cu(OH)2-->CuO-->Cu-->CuSO4-->Cu(OH)2
е)C-->CO2-->Na2CO3-->CO2-->CaCO3
ж)Fe2(SO4)3-->Fe(OH)3-->Fe2O3-->Fe2(SO4)3
з)P-->P2O5-->H3PO4-->Ca3(PO4)2-->H3PO4-->Ca(H2PO4)2
и) Al2(SO4)3-->Al(OH)3-->Al2O3-->AlCl3-->Al(OH)3-->Al(OH)2Cl
к)SO3--ZnSO4-->Zn(OH)2-->ZnO
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