Iron is more electropositive than hydrogen,
that is, iron is more prone to giving up its
electrons to an anion than hydrogen is. For this
reason, at high temperature, the reaction of
oxygen giving up the hydrogens to bond with iron
instead becomes energetically possible,
producing hydrogen gas as a byproduct, releasing
even more energy. At higher temperature yet, the
reaction actually absorbs chemical energy, which
causes it to run in the other direction.
Click Here to return to the search form.