112_Fa11_Ex3-B - Chemistry 112 Name _ Exam III Form B...

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Chemistry 112 Name _______________________ Exam III Form B Section _______________________ November 8, 2011 eMail _______________________ IMPORTANT : On the scantron (answer sheet), you MUST clearly fill your name , your student number , section number , and test form (white cover = test form A; yellow cover = test form B). Use a #2 pencil. There are 25 questions on this exam. Check that you have done all of the problems and filled in the first 25 bubbles on the scantron. The maximum score on this exam is 25 points. Your score will be reported in percent (max 100%). Exam policy Calculators with text-programmable memory are not allowed. Relevant data and formulas, including the periodic table, are attached at the end of this exam. Your grade will be based only on what is on the scantron form. The answer key will be posted on the web after the exam (on the Exam Schedule page). You must turn in your cover sheet with your scantron answer form. Hints As you read the question, underline or circle key words to highlight them for yourself. Avoid errors from "mis-reading" the question. Pay attention to units and magnitudes (decimal places) of numbers obtained from calculations. There is no penalty for guessing.
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CHEMISTRY 112 EXAM 3 November 8, 2011 FORM B ------------------------------------------------------------------------------------------------------------ Use this diagram of a voltaic cell to answer questions 1 and 2 . -------------------------------------------------------------- 1. The balanced equation describing the reaction in the cell pictured above is: A. 2 Ag(s) + Pb +2 (aq) 2 Ag + (aq) + Pb(s) B. Ag + (aq) + Pb +2 (aq) Ag(s) + Pb(s) C. Pb(s) + 2 Ag + (aq) Pb +2 (aq) + 2 Ag(s) D. Ag(s) + Pb(s) Ag + (aq) + Pb +2 (aq) E. NO 3 (aq) + Pb +2 (aq) Pb(s) -------------------------------------------------------------- 2 . Using the table of standard reduction potentials, what is the cell potential of the cell pictured above, E ° cell , under standard conditions? A. – 1.13 V B. + 1.62 V C. + 0.810 V D. + 0.926 V E. – 0.32 V ------------------------------------------------------------------------------------------------------------ Pb Ag Pb +2 NO 3 _ NO 3 _ Ag +
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------------------------------------------------------------------------------------------------------------ 3. Which statement is FALSE about spontaneous chemical processes? A. G rxn is always negative. B. H rxn is always negative. C. E cell is always positive. D. K eq is always greater than 1. E. S universe is always positive. ------------------------------------------------------------------------------------------------------------ 4. What is the oxidation state of sulfur in Na 2 SO 4 ? A.
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This note was uploaded on 12/20/2011 for the course CHEM 112 taught by Professor Vandersluys,lorschmid,kylem during the Fall '07 term at Pennsylvania State University, University Park.

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112_Fa11_Ex3-B - Chemistry 112 Name _ Exam III Form B...

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