Exam 3 - Chemistry 201X: Hour Exam 3 November 17, 2006...

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Chemistry 201X: Hour Exam 3 November 17, 2006 Name: ____KEY____________________________ GRADING Page 1 22 points _________________ Page 2 16 points _________________ Page 3 22 points _________________ Page 4 18 points _________________ Page 5 22 points _________________ TOTAL 100 points _________________ Rules for the Exam: (1) Show all work for the problems (pages 2-5). No credit will be given, even if an answer is written, if no work is shown. (2) Work independently. (3) You may tear off the last page and use it for information and additional scrap paper. Regrading Policy: We make every effort to grade exams thoroughly and accurately. However, when you receive your graded exam and you feel that there are grading errors in your exam, then the following rules apply: (1) You may return the exam for regrading only by the end of the class period in which it is returned to you. Once you leave the classroom with your exam, we will no longer accept it. (2) Write your concern(s) legibly and thoroughly on the front page of the test booklet – indicate clearly what you want to be re-evaluated. (3) We reserve the right to re-evaluate the entire exam when submitted. We wish you a happy, safe and restful Thanksgiving break.
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1 PART I. (22 pts) Short Answer Questions (Fill in the blanks) Energy 2 p 2 s Use the molecular orbital diagram for a main-group dimer for (1)-(3) . (1) (2 pts) How many unpaired electrons does the O 2 ion have? ___ 1 unpaired e ___ (2) (2 pts) What is the bond order of the O 2 ion? (8 5)/2 = 1.5 _____ 1.5 _______ (3) (2 pts) Which molecular ion has the shorter distance, O 2 + or O 2 ? ______ O 2 + _______ (4) (2 pts) A system absorbs 75 kJ of heat from the surroundings while doing 25 kJ of work on the surroundings. What is E system ? What is E surroundings ? E system = ___ + 50 kJ ____ E surroundings = ___ 50 kJ _____ (5) (4 pts) In the following reaction, identify the Brønsted-Lowry acids and Brønsted-Lowry bases on each side of the equilibrium: HSO 4 (aq) + HCO 3 (aq) Z ZX YZZ SO 4 2 (aq) + H 2 CO 3 (aq) ___ acid ___ ___ base ___ ___ base __ ___ acid __ (6) (4 pts) In the following reaction, identify the Lewis acids and Lewis bases on each side of the equilibrium: CN (aq) + H 2 O(l) HCN(aq) + OH (aq) __ base _ _ __ acid _ __ acid __ __ base ___
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Exam 3 - Chemistry 201X: Hour Exam 3 November 17, 2006...

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