lecture notes 15

lecture notes 15 - 1 Chem 11500 Lecture 15 Reading:...

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Unformatted text preview: 1 Chem 11500 Lecture 15 Reading: Identical to lecture 14 2 Week 9: Concentration and Spectroscopy This laboratory will give you an opportunity to work with an example of a very common analytical technique used in all types of labs, not just chemistry labs. 3 Week 9: Concentration and Spectroscopy Goals: Generate a calibration curve from a set of standard solutions. Find the concentration of a solution from its absorbance as measured via UV-Vis spectrophotometer and your calibration curve. 4 Exam 2 Elliot Hall of Music, 8:00 PM, T Oct. 17 Be there by 7:35 PM Bring PUID, pencils, non-programmable calculator, and seat location . The exam covers Lectures 7-15, OWL homework, learning objectives for those lectures, labs (molecular geo., element to salt, human breathing) Energy (light) + Matter (molecules) region of spectrum wavelength range molecular effects and this means gamma pm nm ionizing damage DNA UV-C 200-280 nm Highly damaging; totally absorbed by O 2 and O 3 in upper atmosphere UV-B 280-320 nm Sunburn and skin cancer. Absorbed by O 3 in stratosphere. UV-A 320-400 break bonds/ electron transitions A lot reaches surface of earth through atmosphere; can result in eye damage; tanning Visible 400-700 nm electron transitions IR (near) 700-5000 nm bond vibrations spectroscopy to look at structures of molecules Microwave 1 mm 1 m bond rotations 6 An example of a photochemical reaction with visible light Cl 2 + h 2 Cl 2 Cl + H 2 2 HCl (net) first step initiated by blue/violet light (visible) 7...
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lecture notes 15 - 1 Chem 11500 Lecture 15 Reading:...

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