An oxidation-reduction (redox) reaction is a type of chemical reaction that involves a transfer of electrons between two species.
An oxidation-reduction reaction is any chemical reaction in which the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron. Redox reactions are common and vital to some of the basic functions of life, including photosynthesis, respiration, combustion, and corrosion or rusting.
3x - 2yO2 + 4FexOy → 2xFe2O3
Phương trình số #2
3FeS2 + 20HNO3 → 10H2O + 11NO + 6SO2 + 3Fe(NO3)3
Điều kiện khác: nhiệt độ cao, HNO3 loãng
Phương trình số #3
8H2SO4 + 2KMnO4 + 10FeSO4 → 5Fe2(SO4)3 + 8H2O + 2MnSO4 + K2SO4