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Develop and improve products. List of Partners vendors. Share Flipboard Email. Anne Marie Helmenstine, Ph. Chemistry Expert. Helmenstine holds a Ph. She has taught science courses at the high school, college, and graduate levels. Facebook Facebook Twitter Twitter. Updated February 12, Key Takeaways: Oxidation in Chemistry Oxidation occurs when an atom, molecule, or ion loses one or more electrons in a chemical reaction. When oxidation occurs, the oxidation state of the chemical species increases.
Oxidation doesn't necessarily involve oxygen! The combination of a substance with oxygen. Origin of oxidation. French from oxider to oxidize from oxide oxide oxide. Oxidation Sentence Examples. Related articles. This one cannot be explained in terms of oxygen as this is no oxygen in the reaction and all the substances involved are covalent so there is no loss of gain of electron.
Usually, oxidation and reduction take place simultaneously in a reaction. We call this type of reaction a redox reaction. Magnesium reacts with copper II sulfate solution according to the equation:. Explain, in terms of electrons, why this reaction is a redox reaction. The sulfate ion, SO 4 2- , is the spectator ion in this reaction so the ionic equation is:.
The half equations are higher tier :. The copper II ion is acting as an oxidizing agent. Confusion can result from trying to learn both the definitions of oxidation and reduction in terms of electron transfer and the definitions of oxidizing and reducing agents in the same terms. The following thought pattern can be helpful:. Jim Clark Chemguide. Oxidation and reduction in terms of oxygen transfer The terms oxidation and reduction can be defined in terms of the adding or removing oxygen to a compound.
Oxidation and Reduction with respect to Oxygen Transfer Oxidation is the gain of oxygen. Reduction is the loss of oxygen. Oxidation and reduction in terms of hydrogen transfer These are old definitions which are no longer used, except occasionally in organic chemistry. Oxidation and Reduction with respect to Hydrogen Transfer Oxidation is the loss of hydrogen.
Reduction is the gain of hydrogen. Oxidation and reduction in terms of electron transfer Oxidation and Reduction with respect to Electron Transfer Oxidation is loss of electrons Reduction is gain of electrons.
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