Lecture18, 2-22-08 Rate laws

Lecture18, 2-22-08 Rate laws - The enzyme catalase in blood...

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The enzyme catalase in blood speeds up the decomposition of hydrogen peroxide H 2 O 2 (aq) H 2 O(l) + ½O 2 (g) Δ H = -98.7 kJ mol -1 Catalase is a heme containing redox enzyme. It is found in high concentrations in a compartment in cells called the peroxisome .
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Catalase - enzyme power! Hydrogen peroxide, a natural product of metabolism in your cells, is highly toxic in high concentrations and must be removed quickly! Add ferric ions (Fe 3+ ) Rate increases 30 000-fold Add Catalase Rate increases 100 000 000-fold 2 2 Hydrogen peroxide oxygen water Location of active site where hydrogen peroxide binds
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Reaction Rates • Rates change over time: – reactant rates decrease • Instantaneous rate – rate at a specific time • Average rate Δ [A] over a specific time interval • Initial rate – instantaneous rate at t = 0 • Note: Rates and rate laws are not based on stoichiometry!! They must be determined experimentally .
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C 4 H 9 Cl(aq) + H 2 O(l) C 4 H 9 OH(aq) + HCl(aq) Rate = .025 M/360 s = 6.9 ×10 -5 M/s Rate = .04 M/220 s=1.8 x 10 -4 M/s
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Lecture18, 2-22-08 Rate laws - The enzyme catalase in blood...

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