Fall 09. Exam3

Fall 09. Exam3 - CHEMISTRY 2101 Fall 2009 Dr. Philippe...

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CHEMISTRY 2101 Name___________________________ Fall 2009 Dr. Philippe Buhlmann Hour Exam III December 7, 2009 Page 1 HOUR EXAM III There are 6 pages with problems to this exam. Put your name (or initials on subsequent pages) at the top of EACH PAGE ! Show your work! Problem Points Possible 1 30 2 40 3 30 Total 100 We will correct everything that we can read— promised! Answer the whole question but be succinct! Manage your time! Move on if you get stuck with a problem. h = 6.6262 10 -34 J s 1 eV = 1.6022 10 -19 J At 25 ºC: ln(10) RT/F = 2.303 RT/F = 59.16 mV
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CHEMISTRY 2101 Name___________________________ Fall 2009 Dr. Philippe Buhlmann Hour Exam III December 7, 2009 Page 2 (1) (30 points in total) Spectroscopy (a) (5 points) Which wavelengths are larger, the ones at which a molecule absorbs light or the ones at which a molecule fluoresces? Explain your answer. (b) (5 points) The slit in a UV/Vis spectrophotometer: What are the advantages and disadvantages of a large slit width? (c) (5 points) What is the solvatochromic effect? What is the reason for the solvatochromic effect?
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CHEMISTRY 2101 Name___________________________ Fall 2009 Dr. Philippe Buhlmann Hour Exam III December 7, 2009 Page 3 (d) (5 points) Why does a typical UV/Vis spectrophotometer have two different types of light sources? What are those two light sources? Explain in your answer the role of each light source. (e) (10 points) Dr. Taguchi measured the spectrum of the pure acid form of an indicator dye and the UV-vis spectrum of the pure base form of the dye. She
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This note was uploaded on 10/02/2011 for the course CHEM 2101 taught by Professor Bulman during the Spring '11 term at Minnesota.

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Fall 09. Exam3 - CHEMISTRY 2101 Fall 2009 Dr. Philippe...

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