4FeS2 + 11O2 \(\overset{t^0}{\rightarrow}\)2Fe2O3 + 8SO2
Điện phân có màng ngăn: 2KCl + 2H20 \(\rightarrow\)2KOH+ Cl2 + H2
Al2O3 + 3H2 \(\rightarrow\)2Al + 3H20
2Fe + 3Cl2 \(\overset{t^0}{\rightarrow}\)2FeCl3
2FeCl3 + Fe \(\overset{t^0}{\rightarrow}\)3FeCl2
FeCl3 + 3NaOH \(\rightarrow\)Fe(OH)3 +3NaCl
Al2O3+6HCl\(\rightarrow\)2AlCl3+3H2O
AlCl3+3NaOH\(\rightarrow\)Al(OH)3+3NaCl
2Al(OH)3\(\overset{t^0}{\rightarrow}Al_2O_3+3H_2O\)