2008 Exam 02 - CHE132S08Ex02 Multiple Choice Identify the...

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CHE132S08Ex02 Multiple Choice Identify the choice that best completes the statement or answers the question. All questions count the same, and there is one bonus question so you can miss one and still score 100%. ____ 1. Which one of the following statements about chemical reactions is not correct? A) Equilibrium is reached when the rate of the forward reaction equals the rate of the reverse reaction. B) For the interconversion of compound A and compound B, the same equilibrium concentrations result whether initially there is one mole of A or one mole of B. C) Reaction rates decrease as reactants are consumed. D) The reaction rate always is expressed as a positive number with units. E) It is necessary to monitor the concentration of a reactant in order to determine the reaction rate. ____ 2. Hydrogen iodide HI reacts to form hydrogen H 2 and iodine I 2 . If the concentration of HI is 0.050 M and then 100 s later it is 0.010 M, what is the average reaction rate over this interval? A) 0.012 M min -1 B) 4.0 x 10 -4 M min -1 C) 2.0 x 10 -4 M min -1 D) 0.24 M min -1 E) - 0.24 M min -1 ____ 3. The following data for the initial rate of the following reaction in aqueous solution was obtained using different intial concentrations. What is the correct rate law for this reaction? 2 ClO 2 + 2 OH - ClO 3 - + ClO 2 - + H 2 O [ClO 2 ] 0 M [OH - ] 0 M Intial Rate M/s 0.050 0.050 1.2 x 10 -2 0.100 0.050 4.8 x 10 -2 0.100 0.100 9.6 x 10 -2 A) k[ClO 2 ] 2 [OH - ] 2 B) k[ClO 2 ] 2 [OH - ] C) k[ClO 2 ][OH - ] D) k[ClO 2 ][OH - ] 2 E) k[ClO 2 ] 0 [OH - ] 0 ____ 4. Three graphs labeled I , II , and III are plotted below. These graphs show data collected in kinetics experiments. Which statement about these graphs is correct?
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B) I is for a zero order reaction, the rate constant k = - slope C) II is for a first order reaction, the rate constant k = slope D) II is for a second order reaction, the rate constant k = slope E) III is for a first order reaction, the rate constant k = - slope ____ 5. Cis-fats are considered to be healthier than trans-fats, but if cis-fats are used for cooking, they can isomerize and turn into trans-fats. If the activation energy for this isomerization is 125 kJ/mol, how many times faster is the rate of isomerization at 400 o C than at 25 o C? A) 28.1 B) 1.6 C) 1.6 x 10 12 D) 2.8 x 10 6 E) 1.03 x 10 3 ____ 6. The reaction of nitrogen monoxide, NO, with oxygen, O 2 , to produce nitrogen dioxide, NO 2 , which has a brownish color, contributes to the formation of smog. The following mechanism has been proposed for this reaction. What is the rate law that is predicted by this mechanism? 2 NO
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This note was uploaded on 04/23/2010 for the course CHE 132 taught by Professor Hanson during the Spring '08 term at SUNY Stony Brook.

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2008 Exam 02 - CHE132S08Ex02 Multiple Choice Identify the...

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