ex1 05 - Letter answers are on the last page. Chem 1022...

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Letter answers are on the last page. Chem 1022 ____ ________ _____ 2/16/05, Prof. D. Leopold Your Name (Optional) EXAM 1 (100 points) This exam covers material in Silberberg Chapters 13 (Solutions), 16 (Kinetics), and 17 (Equilibrium, sections 1 and 2 only). You have 60 minutes to do this exam. You may use one 3"x5" index card of notes. Please remember to use a #2 or softer pencil, and bubble in on the answer sheet: your name ( LAST name first! ) student ID number (please double check that you have bubbled this in correctly) form A, B or C as given on a later page of this exam (but do not open the exam now) sign the reverse side of the bubble sheet. There are 20 multiple choice questions, worth 5 points each. You will not be penalized for incorrect answers, so you should answer every question. Each question is graded 5 or 0; there is no partial credit. If you fill in more than one answer for a given question, no credit will be given. If you change your mind, be sure to completely erase the old answer. Caution: As in the WebCT homeworks, some questions may provide information that is not needed to solve the problem. Possibly Useful Equations, Conversions and Constants: (periodic table is on last page) T f = i m K f T b = i m K b P solvent = X solvent P o solvent S gas = k H P gas rate = k : [A] t = -kt + [A] o rate = k [A] : ln[A] t = -kt + ln[A] o ln ([A] o /[A] t ) = kt t ½ = 0.693/k rate = k [A] 2 : 1/[A] t = kt + 1/[A] o k = Ae -Ea/RT ln(k 2 /k 1 ) = (-E a /R) ((1/T 2 ) - (1/T 1 )) K p = K(RT) n R = 8.314 J/(mol·K) = 0.08206 atm·L/(mol·K) 1 atm = 760 torr 0 o C = 273.15 K N A = 6.022x10 23 /mol 1
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PLEASE DO NOT TURN THE PAGE UNTIL THE PROCTOR SAYS TO BEGIN. 2
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Part I. Solutions (9 questions, 45 points) 1. When a nonvolatile solute is added to a volatile solvent, the solution vapor pressure __________, the boiling point __________, the freezing point __________, and the osmotic pressure across a semipermeable membrane __________. A. decreases, decreases, increases, decreases B. decreases, decreases, increases, increases. C. decreases, increases, decreases, increases. D.
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ex1 05 - Letter answers are on the last page. Chem 1022...

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