oxidation

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oxidation The chemical process of removing electrons from an element or compound (e.g. the oxidation of iron compounds from ferrous to ferric); frequently together with the removal of hydrogen ions (H+). The reverse process, the addition of electrons or hydrogen, is reduction.

In biological oxidation and reduction reactions, cytochromes act to transfer electrons, while coenzymes derived from the vitamins niacin and vitamin B2 are intermediate hydrogen acceptors, transferring both electrons and H+ ions.

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oxidation Specifically, a reaction in which oxygen combines with, or hydrogen is removed from, a substance. More generally, any reaction in which an atom loses electrons. For example, in the reaction between zinc and copper sulphate:Zn + Cu2+ + SO42− → Zn2+ + SO42− + Cuthe zinc has lost two electrons and been oxidized. Conversely the copper has undergone reduction.

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oxidation Chemical reaction that involves a loss of one or more electrons by an atom or molecule (always part of an oxidation-reduction reaction in which those electrons are gained by another atom or molecule). Previously the term was more strictly applied to a reaction in which oxygen combines with another element or compound to form an oxide. Oxidation is brought about by oxidizing agents.

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oxidation (oks-i-day-shŏn) n. a reaction in which an atom or molecule loses electrons. Many biological oxidations are effected by the removal of hydrogen atoms, which combine with an oxidizing agent. For example, glucose is oxidized during cellular respiration: C6H12O6+6O2 → 6CO2+6H2O.

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oxidation See oxidation–reduction.

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oxidation A reaction in which atoms or molecules gain oxygen or lose hydrogen or electrons.

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oxidation A reaction in which atoms or molecules gain oxygen or lose hydrogen or electrons.

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oxidation A reaction in which atoms or molecules gain oxygen or lose hydrogen or electrons.