CHM 3120 Exam 2 2010 Key

CHM 3120 Exam 2 2010 Key - CHM 3120 Exam 2 (Form Code A)...

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CHM 3120 Exam 2 (Form Code A) October 14, 2010 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 false? (1) A reaction is favored if the equilibrium constant K is >1. (2) K has units of molar concentrations. (3) A negative value for Δ H favors a reaction (4) A negative value for Δ G favors a reaction. (5) Negative enthalpy and positive entropy favor a reaction. 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 pH change at the equivalence point of a strong acid/strong base titration is determined by concentrations of the analyte and titrant. (4) A weak acid can be titrated by a strong base if the K a of the weak acid is > 10 -5 or greater (5) In the titration of a weak acid with a strong base, the equivalence point pH is > 7 3. Calculate the pAg after addition of 5.0 mL of 0.05 M AgNO 3 to 50.0 mL of 0.04 M KBr. K sp for AgBr = 5 x 10 -13 (1) 10.8 (2) 2.3 (3) 8.72 (4) 3.18 (5) other 4. A 0.7121 g sample of wheat flour was analyzed by the Kjeldahl method for organic nitrogen.
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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 2010 Key - CHM 3120 Exam 2 (Form Code A)...

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