Răspuns:
K+H2O---------> KOH +H2
Na+H2O-------> NaOH +H2
Ca+H2O------->Ca(OH)2 +H2
Mg+H2O-------> Mg(OH)2 +H2
Fe+H2O--------> Fe3O4 +H2
Cu+H2O-------->CuO+H2
K+HCl------------>KCl +h2
K+H2SO4------->K2SO4 + H2
K+HNO3--------->KNO3 +H2
Mg+HCl---------->MgCl2 + H2
Mg+H2SO4----->MgSO4 +H2
Mg+HNO3------->Mg(NO3)2 +H2
Al+HCl------------>AlCl3 +H2
Al+H2SO4------->Al2(SO4)3 +H2
Al+HNO3--------->Al(NO3)3 +h2
Explicație: