C201CR2F05RichsReview - MPRE.CO 411 MED MPRE.CO 411 What is...

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© 2001 Richard Hochstim. All rights reserved. C H H H C201CR2F05 P Rich Hochstim (305) 279-7660 Tutoring in the Sciences since 1984 These questions cover Chapters 3-6 in Bruice. Average time per question: 2 minutes. 1. The next two questions pertains to this energy diagram: A B C D E Reaction Progress Energy Which statement is FALSE with regard to this diagram? [1] The reaction has two steps the first is endothermic, while the second is exothermic. [2] The first step is the rate determining step [3] Two transition states are present in the reaction mechanism [4] At equilibrium the concentration of the intermediate will be greater than the reactant. [5] At equilibrium the concentration of the products will exceed the concentration of the reactants. T1S01-09 [4] ANSWERS IN BRACKETS 2.  Which statement is false with regard to the previous diagram? [1] The transition from energy level E to energy level B represents the overall energy of activation of the reverse reaction. [2] The energy of reaction is negative. [3] The transition from energy level D to energy level C, represents the the energy change between the reactants and the intermediate. [4] The magnitude of the energy barrier that most be over come is of greater importance when evaluating the rate of reaction, than is the absolute value of the most energetic activated complex present in the reaction mechanism. [5] If the intermediate in this reaction mechanism were produced by some alternative pathway, the product of this reaction would form faster than the reactant would. T1S01-09[1] 3.  For the previous diagram, which is the activation energy for the overall reaction in the reverse direction? [1] D minus E [2] B minus E [3] B minus D [4] B minus E [5] A minus E T1S99-12[5] 4. What are the number of sp, sp¤ and sp‹ hybridized atoms respectively, in the compound below?  Y  Z C C C OH O CH 3 X [1] 1,3,2 [2] 2,3,1 [3] 2,2,2 [4] 3,2,1 [5] 3,1,2 T1S99-01 [3] ANSWERS IN BRACKETS 5.  What is the expected bond angle between atoms X and Y, and between atoms Y and Z, respectively, in the representation above? [1] 180Î, 120Î [2] 180, 180Î [3] 109.5Î, 120Î [4] 109Î, 180Î [5] 109, 109Î T1S980405-[1] 6. What is the molecular formula of this structure? Use DOU. O O [1] CŒŒHŒÁO„ [2] CŒŒHŒËO„ [3] CŒŒHŒÈO„ [4] CŒŒHŒØO„ T1S00-16[03] 7. How many sigma and pi bonds, respectively, are present in (CH‰CH„)„CÙC(CH‰)Cl [1] 20, 1 [2] 21, 1 [3] 21, 2 [4] 22, 2 [5] 23, 2 T1S97-09[1] 8. What is the net charge, hybridization, and shape of the structure shown. All valance electrons are displayed. [1] zero, sp‹, trigonal planar [2] zero, sp¤, trigonal pyramidal [3] +1, sp‹, trigonal planar [4] +1, sp¤ trigonal pyramidal [5] +1, sp¤, trigonal planar T1S97-02[5] 9. Radical chain reactions tend to be associated with: [1] the creation and propagation of cations [2] the creation and propagation of anions [3] hydrolysis [4] homolytic bond cleavage [5] the use of large amounts of catalyst T1S00-16[4] PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.CO M PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.CO
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