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Exam%202%20Section%203%20Key - CHEMISTRY 24 1 EXAM I1 FALL...

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CHEMISTRY 24 1 EXAM I1 FALL 2007 Date: Show all your work and clearly state any assumptions you make in a problem! No credit will be given for simply providing an answer. You must clearly show your set-up and work. Go through the exam and work those problems you know how to do first, then start on the more difficult problems. An equation sheet and periodic table have been provided at the end of this exam. Use the space provided. DO NOT use the back of the exam. PLEDGE: I have not given nor received aid on this exam, nor have I seen anyone else give or receive aid on this exam. Signature:
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1. (10 points) Compounds A and B triply charged anions at pH = 10.00. The absolute value of the electrophoretic mobility of A is greater than that of B. i a. (5 points) If the absolute value of the electroosmotic mobility is greater than the Ths ,\ absolute value of the electrophoretic mobility for compounds A and B, which compound will arrive at the cathode (negative end) of the capillary first? Circle your choice. c, cE Compound A QuChi b. (5 points) Which compound, A or B, has a greater hydrodynamic radius? Circle your choice. Compound A 2. (26 points) Answer the following general questions: a. (4 points) Gas chromatography (GC) columns are most often of the open-tubular variety, why is this? SG .r\ L y 5 (3 crA b b-+ f \ 5 o ~CR h& b. (5 points) What are the advantages and disadvantages of an open tubular column, as compared to a packed column?
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Exam%202%20Section%203%20Key - CHEMISTRY 24 1 EXAM I1 FALL...

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