- Cu+H2SO4→CuSO4+H2{C}{u} + {H}_{2}{S}{O}_{4} → {C}{u}{S}{O}_{4} + {H}_{2}
- CaO+H2O→Ca(OH)2{C}{a}{O} + {H}_{2}{O} → {C}{a}\left({{{O}{H}}}\right){2}
- CaCO3→CaO+CO2{C}{a}{C}{O}_{3} → {C}{a}{O} +{C}{O}_{2}
- Fe+2HCl→FeCl2+H2{F}{e} + {2}{H}{C}{l} →{F}{e}{C}{l}_{2} + {H}_{2}