Practice Ex II - Chemistry 162 Exam II November 9, 2010...

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Chemistry 162 Exam II November 9, 2010 Student Name: _______________________ Recitation Section Number: __ Recitation Instructor: __________________ The exam has 21 questions for credit and an additional one to check the color of your exam booklet. Please answer all 22 questions on the OpScan sheet . There is no penalty for guessing. At the end of the 80-minute exam period, please hand in only this top sheet and your OpScan form. If you finish early, please do not disturb your fellow students. A proctor will check your picture-ID, OpScan form, and signature during the exam. Exam scores will be posted as soon as possible. ON THE OpScan FORM: [Use a Number 2 Pencil or Darker] SEC. PER. INST. (1) SIGN your name across the TOP of the form. 01 T6 PORCJA (2) Code ONLY the following information: [ blacken circles] 02 T6 WAIDLICH (a) Your Name… LAST NAME FIRST 04 TH6 PORCJA [ Blank space between last and first names] 06 TH6 WAIDLICH (b) Your RU ID NUMBER [Start under Box A and continue to Box I ] 07 T8 WAIDLICH (c) Your RECITATION SECTION NUMBER [Boxes K & L ] 08 T8 PORCJA [Sections 01 – 08, code the zero under Box K ] (d) Your EXAM FORM NUMBER [Box P ] Your EXAM FORM is: 1 See last page of exam for physical constants, periodic table, and other information.
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162 EXAM II V1 FALL 2010 2 NOTE: FILL IN THE COVER SHEET COMPLETELY BEFORE STARTING THE EXAM TO AVOID PENALTY . 1. What is the K w of pure water at 50.0°C, if the pH is 6.630? A. There is not enough information to calculate the K w . B. 2.13 × 10 -14 C. 1.00 × 10 -14 D. 5.50 × 10 -14 E. 2.34 × 10 -7 2. The unit of the rate constant for the following rate law equation is: Rate = k[A] 2 [B] 2 A. M -3 s -1 B. M -4 s -1 C. M -2 s -1 D. s -1 E. Ms -1 3. The t 1/2 of a second-order decomposition (A ------> Products), is 26 hours when the initial concentration of A is 0.256 M. How long would it take for the concentration of A to drop from 0.256 M to 0.064 M? A. 36 hours B. 26 hours C. 78 hours D. 9.2 hours E. 52 hours
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162 EXAM II V1 FALL 2010 3 4. When ethyl chloride, CH 3 CH 2 Cl, is dissolved in 1.0 M NaOH it is converted into ethanol, CH 3 CH 2 OH, by the reaction CH 3 CH 2 Cl + OH - CH 3 CH 2 OH + Cl - At 25 ° C the reaction is first order in CH 3 CH 2 Cl. If the activation energy is
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Practice Ex II - Chemistry 162 Exam II November 9, 2010...

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