KellyCHEM2BWinter2008Final

KellyCHEM2BWinter2008Final - Chemistry 2 B Final...

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1 Chemistry 2 B Final Examination Name ___________________________ June 12, 2002 1:30 pm T. A. ___________________________ Prof. Peter B. Kelly Section # __________________________ Student ID ________________________ Attached to this exam you should find 2 pages of information that may be detached: (1) Equations and constants (2) periodic table There are a total of 21 problems in this exam. Problems Points Score Instructions: 1-3 45 ____________ No books or notes are allowed. 4-6 45 ____________ All information required is in the exam. 7-10 60 ____________ Multiple choice. Circle the correct answer. 11-13 45 ____________ No partial credit on problems 1-20 14-17 60 ____________ 18-20 100 ____________ Problems 1-19 are 15 points each. 21 15 ____________ 22 45 ____________ Work-out Problems: 23 45 ____________ Show all your work. Box your final answer. 24 40 ____________ Work must be legible for credit. Indicate units as appropriate ______________________ ___________________ Total 500
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2 1. (15 points) In the phase diagram, line DE can be described by the a) Henry’s Law equation. b) Brownian equation. c) Clausius-Clapeyron equation. d) Van der Waal’s equation e) Ideal Gass Law equation. 2. (15 points, no partial credit) List the molecules from the lowest to the highest boiling points: He, LiBr, Ne, H 2 O, Ar, HBr, HCl Highest boiling point ________ ________ ________ ________ ________ ________ Lowest boiling point ________ 3. (15 points) Consider the reaction: 2 HCl ( aq ) + Cu(OH) 2 ( aq ) ' 2 H 2 O ( l ) + CuCl 2 ( s ) a) The entropy of the reaction is > 0 and the enthalpy of the reaction is > 0. b) The entropy of the reaction is < 0 and the enthalpy of the reaction is > 0. c) The entropy of the reaction is > 0 and the enthalpy of the reaction is < 0. d) The entropy of the reaction is < 0 and the enthalpy of the reaction is < 0. e) None of the above.
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3 4. (15 points) Cyanide ion, CN - , is the conjugate base of a weak acid HCN, K a = 4.0 x 10 -10 . Calculate the pH of a 0.2 M solution of sodium cyanide, NaCN. a) 3.3 b) 8.1 c) 9.4 d) 12.4 e) None of the above. 5. (15 points) In a titration of a dilute weak acid with a strong base, which of the following statements is true? a) The pH of the untitrated acid is equal to the pKa. b) The pKa of the acid is the pH at the half titration point. c) The pH of the solution will initially be greater than the pKa. d) The pKa of the acid will vary with the volume of the base added. e) The pH of the solution will be less than the pKa at the equivalence point. 6. (15 points) At 25°C the vapor pressure of pure benzene is 94.6 Torr and that of pure toluene is 29.1 Torr. An ideal solution of benzene mixed with toluene is made up where the mole fraction of benzene is 0.400. The mole fraction of benzene in the vapor is a) 0.31 b) 0.38 c) 0.68 d) 0.76 e) none of the above
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4 Problems 7-10 relate activity to solubility products. 7.
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This note was uploaded on 02/14/2011 for the course CHEM 2B taught by Professor Clemens during the Winter '08 term at UC Davis.

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KellyCHEM2BWinter2008Final - Chemistry 2 B Final...

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