exam_final_b_key - Chem.1310Spring2008FinalExamVERSIONB

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Chem. 1310 Spring 2008 Final Exam VERSION B Professors Williams/Whetten Name _________________________________ Section Number ___________________ 1 There are 69 questions on this exam. It is closed note/book. One 8.5 x 11 handwritten crib sheet (two-sided) is permitted. Please turn off your cell phone. Use a #2 pencil. Calculators are permitted. Computers, PDAs, and other electronic devices with a keyboard are not. Cell phones may not be used as calculators. Complete the Scantron card. Identify your version and your section. Bubble in your student ID#. Scantron errors are punishable by point deductions. A total of three hours is allotted for the exam. Answer every question. There is no penalty for guessing. Circle your answers on the exam form, and bubble them in on the Scantron. Circle Your Section Mindi Ogden A1 W 3-6 Denise Enekwa A2 W 3-6 Deborah Ortiz A3 W 3-6 Yo-Yuan Cheng A4 W 3-6 Wei Long A4 W 3-6 Chiaolong Hsiao B1 Th 3-6 Michael Rood B2 Th 3-6 Chapter 1. ............................................................................................................................ 2 Chapter 2. ............................................................................................................................ 9 Chapter 3. .......................................................................................................................... 15 Chapter 4. .......................................................................................................................... 22
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Chem. 1310 Spring 2008 Final Exam VERSION B Professors Williams/Whetten Name _________________________________ Section Number ___________________ 2 Chapter 1. 1. Given the following pictorial representation for the chemical reaction of Cl 2 and F 2 to form ClF 3 , answer the following question. Cl 2 + 3F 2 2ClF 3 = 2 moles of F 2 = 2 moles of Cl 2 What is the theoretical yield of ClF 3 ? A. 12 mol B. 2.7 mol C. 7.3 mol D. 4.3 mol E. 6.0 mol Answer A: This is a limiting reagent problem. You have 18 mol F 2 and 12 mol Cl 2 . 6 mol of Cl 2 will react with 18 mol of F 2 . So F 2 is limiting. 18 mol F 2 gives 12 mol ClF 3 2. What are the spectator ions in the equation below. NH 4 Cl(aq) + AgNO 3 (aq) AgCl(s) + NH 4 NO 3 (aq) A. NH 4 + and NO 3 - B. Ag + and NO 3 - C. NH 4 + and Cl - D. Ag + and Cl - E. NH 4 + and Ag + Answer A Spectator ions stay in the aqueous phase on both sides of the rxn. 3. What is the correct oxidation state of the nitrogen in [ONO 2 ] - ? A. -7 B. +5 C. -5 D. +4 E. -4 Answer B: Assume O is -2. The molecule has net charge of -1. So -1=3(-2)+OxSt N OxSt N =+5 4. Indium has atomic number 49 and atomic mass 114.8 g. Naturally occurring indium contains a mixture of indium-112 and indium-115, respectively, in an atomic ratio of approximately Indium-112 Indium-115 A. 6 94
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Chem. 1310 Spring 2008 Final Exam VERSION B Professors Williams/Whetten Name _________________________________ Section Number ___________________ 3 B. 25 75 C. 50 50 D. 75 25 E. 94 6 Answer A:
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Chem. 1310 Spring 2008
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This note was uploaded on 09/07/2010 for the course CHEM 1310 taught by Professor Cox during the Fall '08 term at Georgia Institute of Technology.

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exam_final_b_key - Chem.1310Spring2008FinalExamVERSIONB

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