iron (ii)-oxidation yields very little energy when gallionella ferruginea bacteria use fe2 as an energy source (only about 29 kj mol-1). their growth is also inhibited by the rapid abiotic and aerobic oxidation of fe2 . this is a conundrum because the bacteria actually require oxygen in order to grow! assuming that they can scavenge fe2 efficiently, how might these organisms thrive under such conditions?

The oxidation reaction occurs when a molecule, ion, or atom loses electrons during the reaction. when oxidation occurs, the oxidation state of the molecule, ion, or atom increases. For this reason, Fe2+ → Fe3+ is an oxidation reaction as the oxidation state changes from oxidation state 2 to oxidation state 3. Ferrous oxide is a greenish to black powder that is mainly used as a glass color. It can be done by heating a ferrous compound in the absence of oxygen or by passing hydrogen over ferric oxide. Hematite mineral contains ferric oxide, which is a reddish-brown to black powder. It can be made synthetically by burning almost any ferrous compound in the presence of air.

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