ex1 04 - Chem 1022 2/18/04, Prof. D. Leopold Letter answers...

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1 Letter answers are on the last page Chem 1022 _________________ 2/18/04, 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: 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 PLEASE DO NOT TURN THE PAGE UNTIL THE PROCTOR SAYS TO BEGIN.
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2 Part I. Solutions (9 questions, 45 points) 1. Which of the following aqueous solutions has the highest freezing point? A. 0.2 m CuSO 4 B. 0.2 m Ba(OH) 2 C. 0.2 m glucose D . all of the above solutions have the same freezing point E. the freezing point depression constants for these aqueous solutions are required to answer this question 2. What would be the strongest type of intermolecular attraction between the solute and solvent in each solution? (1) AgNO 3 (s) in H 2 O( ) (2) CH 3 CCH 3 ( ) in CH 3 OH( ) (3) CH 3 OH( ) in CCl 4 ( ) A. (1) ion-dipole (2) hydrogen bonding (3) hydrogen bonding B. (1) ion-dipole (2) hydrogen bonding (3) dipole-induced dipole C. (1) ion-dipole (2) dispersion (3) dipole-induced dipole D. (1) dipole-dipole (2) hydrogen bonding (3) dipole-induced dipole
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ex1 04 - Chem 1022 2/18/04, Prof. D. Leopold Letter answers...

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