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Exam 2 Key - Chemistry 201X Hour Exam 2 Name_KEY GRADING...

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Chemistry 201X: Hour Exam 2 October 18, 2007 Name: ______KEY__________________________ GRADING Page 1 16 points _________________ Page 2 31 points _________________ Page 3 18 points _________________ Page 4 15 points _________________ Page 5 20 points _________________ TOTAL 100 points _________________ Rules for the Exam: (1) Show all work for the problems (pages 3-5). 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.
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1 Points: _______ PART I. (16 pts) Short Answer Questions (Circle your choices or fill in blanks) (1) (6 pts) For each of the following pairs of compounds, circle the one that has the lower normal boiling point : CH 4 or C 3 H 8 HF or HCl ICl or Br 2 (2) (2 pts) At the triple point of H 2 O ( p = 0.006 atm, T = 0.01ºC), how many phases of H 2 O coexist? (a) 1 phase (b) 2 phases (c) 3 phases (d) Insufficient information. (3) (2 pts) Which statement about a substance’s behavior at the critical point is true ? (a) Liquid converts completely into gas. (b) Densities of the liquid and of the gas are equal. (c) Gas converts completely into liquid. (d) Liquid and gas form a heterogeneous mixture. (4) (2 pts) Circle the atom or ion with the largest value listed: Radius (Size): Cl Ar K + First Ionization Energy: N O F (5) (2 pts) Which of the following sets of quantum numbers for the hydrogen atom is not allowed .
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