Exam3B - Chemistry 41 Exam 3 Honor Pledge I have neither...

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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 = UV/Vis photon E = IR photon E = µ wave photon
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3. (15pts) Using the data in the Table below, determine a) the best wavelengths at which to measure each compound and b) the concentration of each compound in the mixture. Wavelength (nm) Absorbance of .10 M Compound X Absorbance of .10 M Compound Y Absorbance of Mixture of X & Y 266 .042 .410 .766 288 .082 .283 .571 320 .168 .158 .422 350 .125
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