Land final 05

Land final 05 - 1 Name _ Circle TA: Professor Land Winter,...

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1 Name ____________________________________ Circle TA: Vernon Couch Emily Gussenhoven Professor Land Winter, 2005 CHEMISTRY 2BH Final Exam Instructions: CLOSED BOOK EXAM No books or notes allowed. All information required is contained on the exam. Place all work in space provided. If you require additional space, use the back of the exam. Read each question carefully. There is no partial credit for problems in Part I. Show work in Part II. Credit will be given only for work shown. Answers without work will not receive credit. The last two pages contain potentially useful info and a periodic table. You may remove them for easy access. Graded exams will be available for viewing next quarter. Grades will be posted on the Web site. Page: Possible Points Points 2. 21 Points 3. 20 Points 4. 18 Points 5. 18 Points 6. 24 Points 7. 24 Points 8. 18 Points 9. 24 Points 10. 24 Points 11. 26 Points 12. 23 Points Total Score (240) If you finish early, RECHECK YOUR ANSWERS. UC Davis is an Honor Institution.
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2 1. (6 pts) Given that Δ f (NH 3 (g)) = -46 kJ/mol and the reaction N 2 (g) + 3H 2 (g) 2NH 3 (g) This reaction will a) be endothermic. b) be spontaneous at all temperatures. c) not be spontaneous at any temperature. d) be spontaneous only at high temperatures. e) be spontaneous only at low temperatures. 2. (6 pts) The relationship between the solubility in water, s, and the K sp for the ionic solid Ag 2 CO 3 is: A. K sp = 4s 3 B. K sp = s 2 C. K sp = 2s D. K sp = s 3 E. K sp = 3s 2 3. (5 pts) Consider the following reaction CaO(s) + CO 2 (g) CaCO 3 (s) The equilibrium constant expression for this reaction is A) K c = [CaO]/[CaCO 3 ] B) K c = 1/[CO 2 ] C) K c = [CaO][CO 2 ]/[CaCO 3 ] D) K c = [CO 2 ] E) K c = 1/[CaCO 3 ] 4. (4 pts) The molar heats of vaporization of the halogens, X 2 , increase from top to bottom on the periodic table due to: A. hydrogen bonding B. London forces C. dipole-dipole forces D. ion-ion forces E. ion-dipole forces
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3 5. (8 pts) What is the solubility of AgBrO 3 (K sp = 5.8 * 10 - 5 ) in 0.4 M AgNO 3 ? A. 1.72 * 10 - 4 M B. 1.45*10 - 4 M C. 7.6 * 10 - 3 M D. 1.3 * 10 - 2 M E. 2.5 * 10 - 3 M 6. (6 pts) Consider the following reaction. If, initially, [NOCl] = 2.5 M (all others 0), and at equilibrium, [Cl 2 ] = 0.90 M. Calculate the equilibrium concentration of NO. 2NOCl(g) 2NO(g) + Cl 2 (g) A. 0.60 M B. 1.2 M C. 2.1 M D. 1.8 M E. 0.30 M 7. (6 pts) Calculate the concentration of OH - for an aqueous solution with a pH of 10.45. A. 0.1 M B. 3.5 * 10 -11 M C. 2.8 * 10 9 M D. 2.9 * 10 -5 M E. 2.8 * 10 -4 M
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4 8. (10 pts) Consider a calorimetry experiment where the temperature of the calorimeter increased by 1.45˚C. Which of the following statements are true (circle all that apply - there may be more than one)? A. The reaction was endothermic.
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Land final 05 - 1 Name _ Circle TA: Professor Land Winter,...

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