Exam IV - Chemistry 105 B Exam 4 04/24/08 Dr. Jessica Parr...

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Chemistry 105 B PLEASE PRINT YOUR NAME IN BLOCK LETTERS Exam 4 Name: __________________________________ 04/24/08 Last 4 Digits of USC ID:____ ____ ____ ____ Dr. Jessica Parr Lab TA’s Name: _________________________________ First Letter of last Name Lab: Tu 9 / Tu 1 / Tu 4 / W 1 / W 4 Please circle lab section above . Question Points Score Grader 1 10 2 10 3 22 4 6 5 8 6 10 7 12 8 10 9 12 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. If necessary, please continue your solutions on the back of the preceding page (facing you). 3. YOU MUST use black or blue ink. (No pencil, no whiteout, no erasable ink.) 4. There are 9 problems on 12 pages. Please count them before you begin. A periodic table, table of reduction potentials and some useful equations can be found on the last two pages. 5. Good luck!! =) 1
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1. (10 pt) Assign oxidation states to all of the atoms in each of the following: Na 2 S 2 O 3 Na: ________ S: ________ O: ________ H 2 O 2 H: ________ O: ________ 2. (10 pt) Circle the correct answer, or answer the short answer question: i. Radiocarbon dating depends on the fact that carbon-14: a. is only found in constant supply in dead organisms b. is not radioactive c. has a very short half-life d. is only replenished in living organisms ii. In a concentration cell the anode is a. the compartment with the lower metal ion concentration b. the compartment with the higher metal ion concentration c. either compartment, it depends on the number of electrons being transferred d. either compartment, it depends on the identity of the metal 2
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iii. Consider the following reduction potentials: Cu 2+ + 2e - Æ Cu, +0.34 V Ag + + e - Æ Ag, +0.80 V Fe 2+ + 2e - Æ Fe, -0.44 V Zn 2+ + 2e - Æ Zn, -0.76 V Br 2 +2e - Æ 2 Br - , +1.09 V Ce 4+ + e - Æ Ce 3+ , +1.70 V
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Exam IV - Chemistry 105 B Exam 4 04/24/08 Dr. Jessica Parr...

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