CHEM 1&2 Lab Manual & worksheets pg 208

CHEM 1&2 Lab Manual & worksheets pg 208 - This...

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Experiment 20: Beer’s Law General Chemistry I and II Lab Manual Dakota State University page 208 of 232 HyperChem component: Azobenzene (an acaricide: kills parasites such as ticks and mites) has the following structure: Using the build tool, build this molecule in HyperChem. Be careful to get the correct double bonds. Remember that with the “add H and model build” tool, you need not put hydrogens in explicitly. Choose “Setup…Semiempirical.” Choose “AM1” an click “OK.” Go to “Compute…Geometry Optimization” and click OK to keep the default values. Allow the system to find the optimal geometry for the AM1 basis set. Next choose “Computer…Vibrations” and allow HyperChem to complete the calculations. Finally, go to “Compute…Vibrational Spectrum.”
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Unformatted text preview: This gives you the calculated values where peaks should be found. Clicking on any one of these lines will show you the wavenumber of that line, its intensity and frequency. Clicking “OK” will show the particular vibrational mode of the molecule that gives rise to this particular color of light being absorbed if “animate vibrations” is selected. This shows how light energy is absorbed by molecules; by exciting vibrational modes of the molecule. How does this spectrum compare to the true spectrum of azobenzene? What color do you suppose it is? Calculations: Generate a calibration curve for the standards. From the light absorbed and the calibration curve, determine the concentration of the unknown solution....
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This note was uploaded on 01/27/2012 for the course CHM 2045 taught by Professor Josephwalter during the Fall '11 term at Dakota State.

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