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Test 1 SI sheets page 6

Test 1 SI sheets page 6 - Warshel Students Only 1 Consider...

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Unformatted text preview: Warshel Students Only: 1. Consider the hypothetical reaction A+B+2C92D+3E where the rate law is Rate = 1([A][B]2 An experiment is carried out where [A]O = 1.0 x 10'2 M, [B]0 = 3.0 M, and [C]o = 2.0 M. The reaction is started, and after 8.0 seconds, [A] = 3.8 x 10'3 M. a. Calculate k for this reaction b. Calculate the concentration of A after 13 seconds c. Calculate the concentration of C after 13 seconds Problems from 2005 Warshel Exam 2. True or false: CDflC ' a. The integrated rate law describes the dependence of r te on time b. Termolecular reactions are very rare c. For a bimolecular elementary step the rate law is always second order (1. The half—life of a zero order reaction is constant e. Reactions with high activations barriers are faster than those with low activation barriers Some elementary steps can occur in 10‘12 seconds Catalysts increase the activation barriers of chemical reactions 11. The steric effect tells us what is the frequency of collision of the reacting molecules crqrn 3. The reaction A 9 B is a first order reaction with a half-life of 5 minutes. If we started with 2 moles ofA, how long will it take until we- have 1 mole of B? c’r'N acre 6 4. (1 Consider the figure below: meW a. Mark the position of the activated complex. b. Which letter designates the activation barrier for the reverse reaction? 3 c. What will happen to the activation barrier when the temperature increases? W noth’mg {~142pr rj-o qcaricfcafiov‘l. 1901.wa ...
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