exam3_for_2007

exam3_for_2007 - CHEM. 127/227, EXAM 3, FALL 2007 1. From...

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CHEM. 127/227, EXAM 3, FALL 2007 1. From an examination of the graph shown below, determine (a) whether there is an isokinetic temperature and identify its location on the graph, should it exist, (b) the temperature range where product A is formed in preference to B . (c) Which product, A or B , is kinetically preferred based solely upon consideration of the differences in entropies of activation ? Be certain to provide the reasoning that led to your response. (d) When an isokinetic temperature is observed, what is true about the product ratios at that temperature? 1/T ln(A/B) 0 2. Show your work; use base 10 rather than base e. (a) What is the difference in free energies of activation, ΔΔ G , for competitive kinetically controlled processes when the measured product ratio, at T = 25 °C, corresponds to 100 to 1? (b) Suppose that the difference in free energies of activation is 1.4 kcal/mol. Assuming kinetic control and a temperature of 298 K, determine the product ratio. 3. (a) Formulate a curly arrow mechanism to illustrate each forward step of the sequence shown below.
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This note was uploaded on 10/15/2010 for the course CHEM chem 127 taught by Professor Littlerd during the Fall '09 term at UCSB.

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