Ch112_pracexam_NOans

Ch112_pracexam_NOans - Chem 112 SP10 4:33 PM SP10 Practice...

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1/31/10 4:33 PM Chem 112 SP10 Page 1 of 7 https://cms.psu.edu/section/default.asp?id=MRG%2D091210%2D085710%2Dbz6 SP10 Practice Exam 1 Section 1 1. In the energy profile of a reaction, what is the chemical species called that exists at the maximum on the curve? A. intermediate B. product C. catalyst D. activated complex E. activation energy 2. The overall order of a reaction is 3. What are the units of the rate constant k for the reaction? A. M s ! 1 B. M ! 1 s ! 1 C. M ! 2 s ! 1 D. s ! 1 E. M ! 2 s 3. Which of the following will lower the activation energy for a reaction? A. increasing the concentrations of reactants B. lowering the temperature of the reaction C. adding a catalyst for the reaction D. removing products as the reaction proceeds E. increasing the pressure Section 2 4. The reaction below is a first order reaction. At 230.3°C, k = 6.29 " 10 -4 s -1 . If [CH 3 -N # C] is 1.00 x 10 - 3 atm initially, what is [CH 3 -N # C] after 1000 seconds? CH 3 -N # C $ CH 3 -C # N A. 1.88 x 10 -3 atm B. 4.27x 10 -3 atm C. 1.00x 10 -6 atm D. 2.34x 10 -4 atm E. 5.33x 10 -4 atm 5. The rate law of the overall reaction below is rate = k[A] 2 . Which of the following will not increase the rate of the reaction? A + B $ C A. increasing the concentration of reactant A B. adding a catalyst for the reaction
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1/31/10 4:33 PM Chem 112 SP10 Page 2 of 7 https://cms.psu.edu/section/default.asp?id=MRG%2D091210%2D085710%2Dbz6 C. increasing the concentration of reactant B D. increasing the temperature of the reaction E. All of these will increase the rate. 6. Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction below. In a particular experiment at 300 °C, [NO 2 ] drops from 0.0100 to 0.00650 M in 100 seconds. What is the rate of appearance of O 2 for this period of time? 2 NO 2 $ 2 NO + O 2 A. 1.8 x 10 -5 M/s B. 3.5 x 10 -5 M/s C. 7.0 x 10 -5 M/s D. 3.5 x 10 -3 M/s E. 7.0 x 10 -3 M/s 7. A 1 L flask is filled with 0.124 moles of A and allowed to react to form B according to the reaction below. The following experimental data are obtained for [A] as the reaction proceeds:
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Ch112_pracexam_NOans - Chem 112 SP10 4:33 PM SP10 Practice...

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