16 - Chem 11500 Lecture 16 Reading: Infrared spectroscopy,...

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1 Chem 11500 Lecture 16 Reading: Infrared spectroscopy, pp. 343-344
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2 This week in chemistry Attend lecture, lab, and recitation Homework due on Friday Exam 2 is coming up!
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3 Exam 2 Elliot Hall of Music, 6:30 PM, Monday Oct. 24 Be there by 6:10 PM Bring PUID, pencils, non-programmable calculator, and seat location . The exam covers Lectures 7-14, Connect homework, learning objectives for those lectures, labs (Amount of acid in solution, chemical synthesis, Preparing and standardizing a solution, enthalpy of solution)
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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 break bonds Highly damaging; totally absorbed by O 2 and O 3 in upper atmosphere UV-B 280-320 nm break bonds 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 Results in color IR (near) 700-5000 nm bond vibrations spectroscopy to look at structures of molecules Microwave 1 mm – 1 m bond rotations Microwave ovens
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5 Molecular responses to radiation
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6 Molecular response to radiation CFC example Go to topic 3, lesson 3 for demo Molecular Interactions with Electromagnetic Radiation learning tool.
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7 How do we see stuff that is colored? White Light Wavelengths  we don t see  because they  are absorbed We see the wavelengths that  get reflected (or transmitted) demo
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8 The eye as a visible light detector Retinal Absorption of light by  retinal in rhodopsin  triggers a  cis  to  trans   geometry change 
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9 Absorption spectra for retinal in different
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16 - Chem 11500 Lecture 16 Reading: Infrared spectroscopy,...

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