105bsu09_e4_key

105bsu09_e4_key - Chemistry 105 B Exam 4 08/03/09 Dr....

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1 Chemistry 105 B PLEASE PRINT YOUR NAME IN BLOCK LETTERS Exam 4 Name: ______________________________ 08/03/09 Last 4 Digits of USC ID:___ ___ ___ ___ Dr. Soshanna Potter Lab TA’s Name: ___________________________ Question Points Score Grader 1 10 2 20 3 10 4 24 5 14 6 12 7 10 Total 100 Please Sign Below: I certify that I have observed all the rules of Academic Integrity while taking this examination. Signature: _______________________________________________________________ Instructions: 1. You must show work to receive credit. 2. Please put your answers in the boxes when provided. 3. If necessary, please continue your solutions on the back of the preceding page (facing you). 4. You MUST submit all pages to the proctors, including the periodic table page. Put your name onto the periodic table page in the space provided. 5. You MUST use black or blue ink in order to be eligible for any regrades. (No pencil, no whiteout, no erasable ink.) 6. There are 7 problems on 9 pages. Please count them before you begin. A periodic table and useful equations can be found on the last page. First Letter of last Name
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2 1. (10 pts) a. Which of the following metals is/are able to reduce Zn 2+ ? Circle all that apply. Fe Ni Al Na b. Circle the strongest oxidizing agent: B r 2 Fe 3+ Cr 2 O 7 2- c. Under standard conditions, is H 2(g) capable of reducing Ag + (aq) ? Y e s N o d. Under standard conditions, is Fe 2+ (aq) able to reduce Cr 3+ (aq) to Cr 2+ (aq) ? Y e s N o 2. (20 pts) A galvanic cell is constructed based on the following two half-reactions at standard conditions: Br 2(l) + 2 e - 2 Br - (aq) Cr 2 O 7 2- (aq) + 14 H + (aq) + 6 e - 2 Cr 3+ (aq) + 7 H 2
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105bsu09_e4_key - Chemistry 105 B Exam 4 08/03/09 Dr....

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