- 2Al+3CuSO4→Al2(SO4)3+3Cu2Al+3CuSO4→Al2(SO4)3+3Cu2 Al +3 CuSO _{4} \rightarrow Al _{2}\left( SO _{4}\right)_{3}+3 Cu
- 8Al+3Fe3O4→4Al2O3+9Fe8Al+3Fe3O4→4Al2O3+9Fe8 Al +3 Fe _{3} O _{4} \rightarrow 4 Al _{2} O _{3}+9 Fe
- 2Al2O3 dpnc ⟶4Al+3O22Al2O3⟶ dpnc 4Al+3O22 Al _{2} O _{3} \stackrel{\text { dpnc }}{\longrightarrow} 4 Al +3 O _{2}
- 2Al+3H3SO4→Al4(SO4)3+3H22Al+3H3SO4→Al4(SO4)3+3H22 Al +3 H _{3} SO _{4} \rightarrow Al _{4}\left( SO _{4}\right)_{3}+3 H _{2}