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Unformatted text preview: Chemistry 41 Exam 3 Honor Pledge: I have neither given or received help on this exam, nor have I seen anyone else do so. (Signed)___________________________ 1. 2. 3. 4. 5. 6. 7. 8. Total________ 15 10 15 15 15 10 10 10 100 SHOW YOUR WORK CIRCLE NUMERICAL ANSWERS 1. (15 pts) Draw and label a molecular energy level diagram. Show or describe what happens when a molecule absorbs a) a UV photon; and b) an IR photon rotational vibrational electronic 2. (10 pts) If your analyte absorbs 4.66 eV photons, what light source would you use for an absorbance measurement? Why? (4.66)(1.602 x 10-19 ) = 7.47 x 10-19 J = ν h = E = hc/ λ λ = 266 nm For 266 nm you need a deuterium arc lamp, as it is the only source that generates photons at this wavelength E N E R G Y E N E R G Y ∆ E = UV/Vis photon ∆ E = UV/Vis photon ∆ E = IR photon ∆ E = IR photon ∆ E = µ wave photon ∆ E = µ wave photon 3. (15pts) Using the data in the Table below, determine a) the best wavelengths at which to measure each...
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This note was uploaded on 11/03/2009 for the course CHEM 241 taught by Professor Tiani during the Spring '08 term at UNC.
- Spring '08