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Oxidation-Reduction Reactions (Ox-Redox)

Oxidation-Reduction Reactions (Ox-Redox). examples: -rusting -burning wood -digestion -photosynthesis. Reactions with a loss and a gain of electrons. Coupled reaction- you can’t have one without the other Oxidation-loss of electrons; substance said to be “oxidized”

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Oxidation-Reduction Reactions (Ox-Redox)

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  1. Oxidation-Reduction Reactions (Ox-Redox) examples: -rusting -burning wood -digestion -photosynthesis

  2. Reactions with a loss and a gain of electrons • Coupled reaction- you can’t have one without the other • Oxidation-loss of electrons; substance said to be “oxidized” • Reduction-gain of electrons; substance said to be “reduced” • Biological systems involve the transfer of H atoms (2H+ and 2e-)

  3. LEO the lion goes “GER”!

  4. Oxidation: Always involves loss of electrons May involve addition of oxygen May involve loss of H Reduction: Always involves gain of electrons May involve loss of oxygen May involve gain of H Characteristics of Ox-Redox

  5. Oxidation of Alcohols • In organic chemistry, think of Ox-Redox reactions as a loss of H atoms or the addition of oxygen • Oxidation includes an increase in the number of C-O bonds (see example p. 396 in Timberlake) • Oxidation of a primary alcohol produces an aldehyde • Aldehydes, in turn, oxidize into carboxylic acids • Secondary alcohols oxidize into ketones • Tertiary alcohols do not oxidize (why not?)

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