Exam 3 Key - Chemistry 201X: Hour Exam 3 November 16, 2007...

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Chemistry 201X: Hour Exam 3 November 16, 2007 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. Final Exam: Friday, December 14, 9:45 – 11:45 AM, 1810 Gilman Hall We wish you a happy, safe and restful Thanksgiving break.
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1 Points: ________ PART I. (22 pts) Short Answer Questions (Fill in the blanks) P F ax F ax H 3 C F eq F eq Consider the molecule PF 4 (CH 3 ) to the left. (1) (2 pts) What is the molecular geometry at the P atom? ______ Trigonal_Bipyramid_____ (2) (2 pts) What is the hybridization of atomic orbitals at the P atom? _________ ( sp 2 )( p ) _____________ (3) (2 pts) Which P F distances are expected to be longer , P F ax or P F eq ? __________ P F ax ____________ (4) (2 pts) A system releases 75 kJ of heat to the surroundings while doing 25 kJ of work on the surroundings. What is E system ? What is E surroundings ? q = 75 kJ w = 25 kJ E system = _____ 100 kJ _____ E surroundings = ____ 100 kJ _____ (5) (4 pts) In the following reaction, identify the Brønsted-Lowry acids and Brønsted-Lowry bases on each side of the equilibrium: NH 3 (aq) + HCO 3 (aq) Z ZX YZZ CO 3 2 (aq) + NH 4 + (aq) ___ Base __ __ Acid __ ___ Base __ __ Acid __ (6) (4 pts) Write the balanced chemical equation that corresponds to the heat of formation of potassium hydroxide, KOH(s). 0 (KOH,s) 424.8 kJ/mol f H ∆= .
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Exam 3 Key - Chemistry 201X: Hour Exam 3 November 16, 2007...

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