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Chm 115 F13 Lect 20

Chm 115 F13 Lect 20 - Lecture 20 Daily Page Thursday Oct 31...

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1 Lecture 20 – Daily Page Thursday, Oct. 31, 2013 LEARNING OBJECTIVES Identify region of the EM spectrum where electronic, vibrational, and ASSIGNMENTS CONNECT Homework: í HW 19 due Thurs., Oct. 31 rotational transitions occur. Identify region of the EM spectrum where bonds can be broken. Understand characteristics of molecules necessary for IR absorption to occur í HW_Review1 due Thur., Oct. 31 í HW 20 due Mon., Nov. 4 Reading for Tuesday: í Section 15.5 - Polymers Laboratory í Lab: Preparation of Luminol (Ch 9) absorption to occur. Know effect of mass, bond energy, and bond order on vibrational frequency for a given pair of atoms. (Ch. 9) Lecture 21 í Polymers Chem 11500 Lecture 20 Reading: Infrared spectroscopy pp. 343-344 2
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2 Energy ( n light | ) + Matter (molecules) region of spectrum wavelength range molecular effects …and this means… gamma pm nm ionizing damage DNA pm – nm 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 Molecular responses to radiation 4
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3 Molecular response to radiation CFC example – Go to topic 3, lesson 3 for demo Molecular Interactions with Electromagnetic Radiation learning tool. 5 3-D Molecular Shape and Vision • Rhodopsin is responsible for detecting visible light detecting visible light in rods. • Rhodopsin consists of 11- cis -retinal covalently bonded to a large protein 6 a large protein. Note how 11- cis - retinal n fits | into the protein to allow it to bond.
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4 3-D Molecular Shape and Vision When light strikes the molecule, the shape molecule, the shape will change via a rotation around the 11-12 bond.
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