exam1B - Chemistry 41 Exam 1 Honor Pledge: I have neither...

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Chemistry 41 Exam 1 Honor Pledge: I have neither given nor received help on this exam, nor am I aware of anyone else who has done so. _______________________________(Signed) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Total ______ 12 10 10 5 10 15 10 8 10 10 100 SHOW YOUR WORK CIRCLE NUMERICAL ANSWERS 1.(12pts) What chromatographic technique would be best for the following analyses? a) determine specifically the presence of marijuana in urine. Affinity b) separating the components in cigarette smoke. Gas c) separating Cl - and NO 2 - in a water sample. Ion Exchange d) remove the salts from a biological sample of proteins. Gel Permeation, Molecular Exclusion, Size Exclusion 2.(10pts) For a capillary electrophoresis system with an electroosmotic mobility of 3.1 x 10 -8 m 2 /Vs at pH =2, and 8.1 x 10 -8 m 2 /Vs at pH =12, how long will it take a neutral analyte to travel to the detector that is 52 cm from the beginning of the column? At pH = 2, 0.52m/3.1 x 10 -8 m 2 /Vs = 1.7 x 10 7 sV/m At pH = 12, 0.52m/8.1 x 10 -8 m 2 /Vs = 6.4 x 10 6 sV/m (You do what you can with the data given; make sure your units are correct)
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exam1B - Chemistry 41 Exam 1 Honor Pledge: I have neither...

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