campbl09 - Bioenergetics Oxidation and Reduction Oxidation...

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Bioenergetics
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Oxidation and Reduction Oxidation is the Loss of Electrons E.g., something that is oxidized in the course of a chemical reaction with Oxygen has had electrons stolen by Oxygen Reduction is the Gain of Elections E.g., a gain of electrons results in a decrease (reduction) in electrical charge (since electrons carry a negative charge) Metal ores are “Reduced” to metals (via the addition of electrons)—metals found in ores are in an oxidized form relative to metals found as metals
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Oxidation and Reduction Note that oxidation and reduction are not necessarily complete: E.g., movement of an electron from relatively close to an atom’s nucleus to farther away, but still bonded, is also oxidation (and moving an electron closer is still reduction) E.g., electrons in C-H bond are closer to C than those in C-O
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Oxidation of Carbon (1/2) Increasing Oxidation structure name #C-Hs #Os #C-Os CH 4 methane 4 0 0 CH 3 OH methanol 3 1 1 CH 2 O formaldehyde 2 1 2 H-COOH formic acid 1 2 3 CO 2 carbon dioxide 0 2 4
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Oxidation of Carbon (2/2) This is Carbon Dioxide O=C=O H | H-C=O H H | | H-C-O | H H-C-H | H O-H | H-C=O
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Complete Oxidation of a Hydrocarbon C X H Y + (X+¼Y)O 2 XCO 2 + ½Y(H 2 O) + Energy •Note that each Carbon gives rise to one CO 2 •Note that every 2 Hydrogens gives rise to one H 2 O •CO 2 is the common highly Oxidized form of Carbon •H 2 O is the common highly Oxidized form of Hydrogen •(note also that H 2 O represents a reduced form of Oxygen) C 3 H 8 + (3+2)O 2 3CO 2 + 4(H 2 O) X X Y Y Y + Energy
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+ Energy C 6 H 12 O 6 + (6+3-3)O 2 6CO 2 + 6(H 2 O) C X H Y + (X+¼Y)O 2 XCO 2 + ½Y(H 2 O) C 6 H 12 O 6 + 6O 2 6CO 2 + 6(H 2 O) Glucose is a Hexose! + Energy
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This note was uploaded on 06/03/2011 for the course BIO 113 taught by Professor Swenson during the Spring '08 term at Ohio State.

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campbl09 - Bioenergetics Oxidation and Reduction Oxidation...

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