A \[\ce{H2O -> H2 +O2}\]; hidrógeno B \[ \ce{HgO -> Hg + \frac{1}{2}O2}\]; mercurio C \[ \ce{H2O2 -> H2O + \frac{1}{2}O2}\]; hidrógeno D \[ \ce{CaCO3 -> Ca + CO2}\]; calcio E \[\ce{P4 + H2O -> PH3 + H3PO2}\]; fósforo