Lecture17 - BCH 227 FALL 2010 LECTURE 17 REDOX...

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1 Redox Phosphate-Based Energy Carriers BIOCHEM 227 FALL 2010 Lecture 17 Friday, October 8, 2010 TODAY • Continued: redox • Phosphate-based energy carriers BCH 227 FALL 2010 LECTURE 17: REDOX; PHOSPHATE-BASED ENERGY CARRIERS 8 OCT 2010
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2 Redox Chemistry • Transfer of electrons – Electronegative atoms want electrons – When an electronegative atom takes an electron, energy is released – True also for partial ownership of shared electrons Some Examples •Combu s t ion –of wood methane • Biological – acetaldehyde/ethanol BCH 227 FALL 2010 LECTURE 17: REDOX; PHOSPHATE-BASED ENERGY CARRIERS 8 OCT 2010
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3 Redox Chemistry •Ox id a t ion s t a t e – Measures how many electrons an atom controls only the scale is backwards! • More positive = less electrons • Example: Fe(II) has one more e - than Fe(III) Redox Chemistry •R edu c t – Acquisition of an electron or a part of an electron Reduces the oxidation state • Makes it less positive • Fe(II) is less positive than Fe(III) → Fe(III) is reduced (verb) to make Fe(II), the reduced (adj) form 32 Fe Fe e + −+ +→ BCH 227 FALL 2010 LECTURE 17: REDOX; PHOSPHATE-BASED ENERGY CARRIERS 8 OCT 2010
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4 Redox Chemistry •Ox id a t ion – Surrender of an electron or a part of an electron – Increases the oxidation state • Makes it more positive • Fe(III) is more positive than Fe(II) → Fe(II) is oxidized (verb) to make Fe(III), the oxidized (adj) form 23 Fe Fe e ++ →+ Redox Chemistry • Oxidation/reduction – Can go either way
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This note was uploaded on 12/19/2010 for the course BIOCHEM 227 taught by Professor Coggins during the Fall '10 term at Duke.

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Lecture17 - BCH 227 FALL 2010 LECTURE 17 REDOX...

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