The molecule that functions as the reducing agent (electron donor) in a redox reaction loses electrons and also loses energy.
A redox reaction is a type of chemical reaction where one molecule gains electrons (the oxidant agent) while the reducing agent loses electrons.
Electrons are negatively charged subatomic particles that atoms have in their orbits and serve to form chemical bonds.
An example of an oxide-reduction (redox) reaction is the oxidation of iron, a process where this metal is oxidized and simultaneously oxygen is reduced.
In conclusion, the molecule that functions as the reducing agent (electron donor) in a redox reaction loses electrons and also loses energy.
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