- P+O2→P2O3{P} + {O}_{2} → {P}_{2}{O}_{3}
- Na+H2SO4→Na2SO4+H2{N}{a} + {H}_{2}{S}{O}_{4} → {N}{a}_{2}{S}{O}_{4} + {H}_{2}
- Ba+2HCl→H2+BaCl2{B}{a} + {2}{H}{C}{l} → {H}_{2} + {B}{a}{C}{l}_{2}
- Mg+O2→MgO{M}{g} + {O}_{2} → {M}{g}{O}