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practice_midterm2_e - Dr Bryan Enderle Winter 2003 Name...

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Dr. Bryan Enderle Name:______________________________ Winter 2003 Student ID Number:___________________ T.A.:_______________________________ Lab Section/Room:____________________ CHEMISTRY 2B Exam II February 27, 2003 Instructions: Multiple Choice Do not open the exam until instructed to do so. Place all answers in the space provided. If you require additional space, 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. use the back of the exam. No sharing calculators. Write your name and your T.A.’s name on each page of the exam. The exam consists of 9 pages total. The last 2 pages contain helpful information. No programmable calculators, books, notes, or scratch paper allowed. Thank you for reading the instructions. Show all work for problems in Part C of the exam to receive full or partial credit. You will have 1 hour 20 minutes to complete this exam. Answer all the questions you are sure of first, then use the remaining time for the rest. UCD is an honor institution Part Problem Number Points Possible Points Earned A 1-14 28 B 15 10 B 16 9 B 17 12 C 18 10 C 19 14 C 20 15 TOTAL SCORE: (out of 100 pts)
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Name: T.A.’s name: Part A : Multiple Choice – Concepts and Calculations. Write the correct answer in the space provided on the first page. No partial credit will be given. 1. Use the table at the back of the exam to determine which of these acids dissociates in water to the greatest extent (i.e., find the strongest acid)? a. iodic b. benzoic c. hypochlorous d. hydrofluoric e. phenol 2. Which of the following equilibrium constants-reaction type is incorrect? a. 1.4 x 10 83 - goes to completion b. 1.6 x 10 -23 - does not occur c. 1.8 x 10 -5 - equilibrium reaction more reactants than products at equilibrium d. 1.0 - equilibrium reaction-equal amounts of products and reactants e. 3.2 x 10 3 - equilibrium reaction-more reactants than products at equilibrium 3. For the reaction 2 SO 2 (g) + O 2 (g) 2 SO 3 (g), K c = 2.8 x 10 2 at 1000 K. If a vessel is filled with these gases such that the initial concentrations are [SO 2 ] = 0.025, [O
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