CHEM 2B Practice Exam II - Spring09

CHEM 2B Practice Exam II - Spring09 - Dr. Bryan Enderle...

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Name______________________________________________ Student ID Number___________________________________ LAB Sec. # ___; TA: __________; Lab day/time: __________ Dr. Bryan Enderle Spring 2009 CHEMISTRY 2B (Section D) Exam II Instructions: CLOSED BOOK EXAM ! No books, notes, or additional scrap paper are permitted. All information required is contained on the exam. Place all work in the space provided. If you require additional space, use the back of the exam. A scientific calculator may be used (if it is a programmable calculator, its memory must be cleared before the exam). (1) Read each question carefully. (2) For Parts I and II , there is no partial credit given and only answers marked on this cover page will be graded . (3) The last page contains a periodic table and some useful information. You may remove it for easy access. (4) If you finish early, RECHECK YOUR ANSWERS! U.C. Davis is an Honor Institution Possible Points Points #1–12. (3 points each) / 36 #13-16. (6 points each) / 24 #17-19. (6 points each) / 18 #20. (14 points) / 14 #21. (10 points) / 10 #22. (7 points) / 7 Total Score (109) / 109 Multiple Choice (circle one) 1. a b c d e 2. a b c d e 3. a b c d e 4. a b c d e 5. a b c d e 6. a b c d e 7. a b c d e 8. a b c d e 9. a b c d e 10. a b c d e 11. a b c d e 12. a b c d e 1-12 total pts: 13. a b c d e 14. a b c d e 15. a b c d e 16. a b c d e 13-16 total pts:
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Name: ____________________________________ Exam II (Page 2 of 10) Part I: Multiple Choice, Concepts (3 pts each) Select the best answer and enter your choice on the cover sheet – No partial credit 1. What is the buffer range for a benzoic acid/sodium benzoate buffer? [ K a for benzoic acid is 6.3 x 10 5 ] a. 8.8 ~ 10.8 b. 4.2 ~ 6.2 c. 3.2 ~ 5.2 d. 2.2 ~ 4.2 e. –4.2 ~ –2.2 2. Which of the following would NOT be a good buffer pair? a. ammonium chloride (NH 4 Cl) and ammonia (NH 3 ) b. acetic acid (HC 2 H 3 O 2 ) and sodium acetate (NaC 2 H 3 O 2 ) c. sodium chloride (NaCl) and sodium hydroxide (NaOH) d. potassium carbonate (K 2 CO 3 ) and potassium bicarbonate (KHCO 3 ) e. 0.10 M NaOH and 0.20 M acetic acid (HC 2 H 3 O 2 ) 3. For the following reaction starting at equilibrium: 2 SO 2 (g) + O 2 (g) 2 SO 3 (g) ΔH = -197.8 kJ K c = 2.8 x 10 2 What will cause an increase in the number of moles of SO 3 ? a.
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This note was uploaded on 10/22/2010 for the course CHE CHE 2B taught by Professor Toupadakis during the Fall '09 term at UC Davis.

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CHEM 2B Practice Exam II - Spring09 - Dr. Bryan Enderle...

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