102 handout 1018 - REDOX REACTIONS Electrons ALWAYS flow...

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REDOX REACTIONS Electrons ALWAYS flow towards the redox pair with the HIGHER standard reduction potential, E’°. To solve a redox problem: 1. Determine which half-reaction has the higher E’°. 2. Reverse the other reaction and the sign of its E’° value. 3. Add the reactions, canceling out species that appear on the product side of one reaction and the reactant side of the other reaction, to get the net reaction. 4. Add the E’° values to get ΔE’°. 5. Check whether 1 or 2 electrons is/are transferred to get n. 6. Substitute ΔE’° and n into the equation ΔG’° = -nFΔE’° (F = 96.5 kJ/V·mol). For each of the following pairs of half-reactions, what the net reaction and the free energy change? Fumarate + + 2H + + 2e - Succinate E’° = 0.03 FAD+ 2H + + 2e - FADH 2 E’° = -0.22 Acetaldehyde + 2H + + 2e - Ethanol E’° = -0.20 NAD + + 2H + + 2e - NADH + H + E’° = -0.32 PENTOSE PHOSPHATE PATHWAY-see last week’s handout Oxidative part enzymes- glucose 6-phosphate dehydrogenase, lactonase and 6-phosphogluconate dehydrogenase
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