CHM 3120 Exam 2 2011 Key

CHM 3120 Exam 2 2011 Key - CHM 3120 Exam 2 (Form Code A)...

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CHM 3120 Exam 2 (Form Code A) October 13, 2011 Instructions: On your scantron sheet enter your name, UF ID number (start on the first space and leave the last space blank), and Form Code (see above). This exam consists of 20 multiple choice questions each worth 10 points for a total maximum of 200 pts. You may retain your exam sheet. Turn in only the scantron. Bubbling errors of any kind will count as an incorrect response or result in the loss of points. 1. Which of the following statements is true? (1) A reaction is favored if ΔG is positive. (2) A negative ΔS favors a reaction. (3) If Q>K, the reaction must proceed to the left to reach equilibrium (4) A reaction is spontaneous if ΔG o is positive. 2. Which of the following statements about titrations is not correct?: (1) The equivalence point is obtained by adding the stoichiometric amount of titrant to the analyte solution. (2) The endpoint is marked by a sudden change in some physical property (e.g., color) of the solution. (3) The difference between (1) and (2) above may be insignificant. (4) A method involving a back titration is, in principle, less accurate than a direct titration. (5) In the titration of a weak acid with a strong base, at the equivalence point pH = pK a 3. What is the activity coefficient for Ca +2 in a 0.01 M solution of Ca(ClO 4 ) 2 ? Assume the ά (size) for Ca +2 is 600 pm. (1) 0.81 (2) 1.05 (3) 0.68 (4) 0.55 (5) other 4. The protein in a 2.2846 g sample of a grain cereal is to be determined by a Kjeldahl method for organic nitrogen. The sample is digested with H
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This note was uploaded on 10/13/2011 for the course CHM 3120 taught by Professor Harrison during the Fall '08 term at University of Florida.

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CHM 3120 Exam 2 2011 Key - CHM 3120 Exam 2 (Form Code A)...

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