test2 - Chemistry 105 B Professor Bradforth Midterm 1...

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Chemistry 105 B Midterm 1 Professor Bradforth Spring 2007 YOU MUST SHOW YOUR COMPLETE WORKING ON EACH OF PROBLEMS 6-9 TO RECEIVE FULL CREDIT. STATE AND JUSTIFY ANY APPROXIMATIONS YOU MAKE. Useful Physical Constants and Equations T C = T K - 273.15 R = 8.314 J K -1 mol -1 Zeroth Order reaction: [A] = [A] 0 - k t half life t 1/2 = [A] 0 / (2 k) First Order reaction: ln [A] = ln [A] 0 - k t half life t 1/2 = 0.693 / k Second Order reaction : 1/ [A] = 1/[A] 0 + k t half life t 1/2 = 1 / ( k [A] 0 ) Arrhenius Equation: k = A exp( - E A / RT) - = T R E A k A 1 ) ln( ) ln( - - = 1 2 1 2 1 1 ln T T R E k k A
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Multiple Choice questions (2 points each) : Question 1) A given reaction is found to be exothermic (gives off a significant amount of heat). What can be said about this reaction? (a) Since so much energy is given off the reaction will be very fast (b) The activation energy will be small (c) The reaction will be slow because energy is being given off (d) The potential energy of the products is greater than that of the reactants (e) None of the above Question 2) What are the units for the rate constant of a third order reaction? (a)
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test2 - Chemistry 105 B Professor Bradforth Midterm 1...

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