CHEM 2B Final Exam Winter09 - KEY

CHEM 2B Final Exam Winter09 - KEY - Name_ Student ID...

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Name__________________________________________________ Student ID Number_______________________________________ LAB Sec. # _____; TA: ____________; Lab day/time: __________ Winter 2009 CHEMISTRY 2B (Section C) Final Exam 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. (1) Read each question carefully (27 problems, 15 pages). (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 two pages contain a periodic table and some useful information. You may remove these pages for easy access. (4) If you finish early, RECHECK YOUR ANSWERS! (5) Circle your choice on the right for questions 1–20. Possible Points U.C. Davis is an Honor Institution Earned Points #1–12 (3 points each) / 36 #13–20 (6 points each) / 48 #21 (6 points) / 06 #22 (6 points) / 06 #23 (20 points) / 20 #24 (6 points) / 06 #25 (18 points) / 18 #26 (6 points) / 06 #27 (14 points) / 14 Total Score (160) /160 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 17. a b c d e 18. a b c d e 19. a b c d e 20. a b c d e 13-20 total pts:
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Final Exam Winter 2009 Page 2 of 15 Initial: ___________ Part I: Multiple Choice, Concepts. (3 points each) Circle the best answer. Circle your response on the cover page . No partial credit. 1. (3 pts) Which of the following statements is TRUE? a. H sys is negative for an endothermic process. b. When compressing a gas work has a negative sign. c. For a reaction carried out at constant pressure always U = H. d. The change of the internal energy of a system U is equal to the algebraic sum of work and heat transferred between the system and its surroundings. e. The enthalpy for a reaction that occurs at constant volume is always the same as the enthalpy for the same reaction that occurs at constant pressure. 2. (3 pts) Which of the following compounds can form hydrogen bonds? a. H 2 S b. CH 3 OCH 3 c. HCl d. BH 3 e. NH 3 3. (3 pts) Which of the following statements is TRUE? a. Addition of solute increases the freezing point of a solution compared to pure solvent. b. Addition of more solvent increases the boiling point of a solution. c. To increase osmotic pressure we must add more solute. d. The vapor pressure of pure water is lower than the vapor pressure of an aqueous salt solution. e. A solution of 0.1 m acetone (non-electrolyte) has the same freezing point as a solution of 0.1 NaCl (strong electrolyte). 4. (3 pts) Consider the exothermic reaction: 2A (aq) + B (aq) 2 C (aq) + D (s) Which of the following statements is FALSE? a. Adding A increases the concentration of C b. Adding A decreases the concentration of B c. Adding C increases the concentration of B d. Adding heat increases the concentration of C.
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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 Final Exam Winter09 - KEY - Name_ Student ID...

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