sample4_sp03_key

sample4_sp03_key - Chemistry 105b Professor Mak Spring 2003...

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1 Chemistry 105b Name Professor Mak Last 3 digits of SS# Spring 2003 Lab T.A.'s Name Hour Exam 4 Lab Day & Time First Letter of Family Name Question Points Score Grader 1 15 2 15 3 15 4 20 5 10 6 10 7 15 TOTAL 100 Instructions: 1. There are a total of fifteen (15) pages. Count the pages before you begin. 2. If necessary, please continue your solutions on the back of the preceding page (facing you). 3. Do not use blue pen or pencils. ACADEMIC INTEGRITY (Please sign below) : I certify that I have observed all the rules of ACADEMIC INTEGRITY while taking this exam. (signature)
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2 1. (3 points each) (a) Give the proper systematic name for the coordination compound: [Cr(NH 3 ) 3 (H 2 O)Cl 2 ]Cl (b) Give the correct chemical formula for the coordination compound: sodium hexacyanoferrate (III) (c) How many d electrons does the ion Cu 2+ have? (d) The structure of the complex ion [Co(CN) 2 (en) 2 ] + is: (en = ethylenediamine) a. linear b. square planar c. tetrahedral d. octahedral e. none of the above (e) Which of the following metals can be used as a “sacrificial anode” in the method of cathodic protection to prevent steel in buried fuel tanks and pipelines from rusting? a. copper b. magnesium c. silver d. lead e. all of the above
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3 2. (15 points) A galvanic cell is constructed based on the following two half-reactions at standard condition: Cu 2+ + e --> Cu + Ni 2+ + 2 e --> Ni (You will need to turn one of these two half-reactions around to get the oxidation half-reaction.) (a) Write down the balanced overall reaction. (b) Is the reaction spontaneous in the forward direction as it is written in your answer to part (a) or is it spontaneous in the reverse direction? (Circle one of the following.) a. spontaneous in the forward direction b. spontaneous in the reverse direction (c) Draw a diagram of this galvanic cell. Clearly label the following in your diagram: 1. the cathode and the material it should be made out of 2. the anode and the material it should be made out of 3. the relevant ions in the solution in each half-cell 4. the direction of electron flow 5. the salt bridge
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This note was uploaded on 04/25/2008 for the course CHEM 105BL taught by Professor Warshel during the Spring '07 term at USC.

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sample4_sp03_key - Chemistry 105b Professor Mak Spring 2003...

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