Exam I S09 - Key 2

Exam I S09 - Key 2 - Name_ Student ID Number_ LAB Sec. # _;...

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Name______________________________________________ Student ID Number___________________________________ LAB Sec. # ___; TA: __________; Lab day/time: __________ Dr. Bryan Enderle Spring 2009 CHEMISTRY 2B (Section D) Exam I 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 #1–10. (3 points each) / 30 #11-15. (6 points each) / 30 #16-17. (13 points) / 13 #18. (9 points) / 9 #19. (9 points) / 9 #20. (14 points) / 14 #21. (8 points) / 8 Total Score (113) / 113 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 Total: 11. a b c d e 12. a b c d e 13. a b c d e 14. a b c d e 15. a b c d e Total:
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Name: ____________________________________ Exam I (Page 2 of 10) Part I: Multiple Choice, Concepts (3 points each) Select the best answer and enter your choice on the cover sheet – No partial credit 1. Which liquid would be the most volatile (highest vapor pressure)? A. CH 3 - CH 2 - CH 2 - CH 2 - CH 2 - Cl B. HO - CH 2 - CH 2 - CH 2 - CH 2 - OH C. CH 3 - CH 2 - CH 2 - CH 2 - CH 2 - CH 3 D. CH 3 - CH 2 - CH 2 - CH 2 - CH 2 - H E. CH 3 - CH 2 - CH 2 - CH 2 - CH 2 - OH 2. The phase diagram for a pure substance is given below. The substance is stored in a container at 80 atm at 25°C corresponding to the point indicated. Approximately what is the molar enthalpy change of the system when cooled to -25°C through a phase change and under constant pressure? ( c represents the molar heat capacity) A. H fus + liquid c ×50 K B. H vap + liquid c ×50 K C. -∆ H fus - liquid c ×50 K D. -∆ H vap - vapor c ×50 K E. -∆ H vap - liquid c ×50 K 3. The coordination number of an atom at the corner of this unit cell is A. 6 B. 3 C. 4 D. 8 E. Depends on adjacent unit cells. 4.
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Exam I S09 - Key 2 - Name_ Student ID Number_ LAB Sec. # _;...

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