StudentLecture_15

StudentLecture_15 - Lecture 15 10/20/2009 Lab:...

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    Lecture 15 10/20/2009 Lab: Concentration and Spectroscopy, CH 6, an Lab: Concentration and Spectroscopy, CH 6, an opportunity to work with an example of a very opportunity to work with an example of a very common analytical technique used in all types of common analytical technique used in all types of labs, not just chemistry labs. labs, not just chemistry labs. For this lab read the information posted on Blackboard For this lab read the information posted on Blackboard in the “Lab Information” Folder, in the “Conc and in the “Lab Information” Folder, in the “Conc and Spec” sub-folder. Spec” sub-folder. HW as usual HW as usual Exam 2: 6:30 PM (earlier than the last exam) Monday, October 26 , same seats as before (on Blackboard in “My Grades”), arrive 15 min. early with pencils, simple calculator. Topics: Reading Assignments and Learning Objectives for Lectures 7 - 14 on Blackboard. Any additional material in Lectures 7 - 14. Labs in Chapters 3, 4, 5.
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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 and O in upper atmosphere UV-B 280-320 nm break bonds Sunburn and skin cancer.
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    An example of a “photochemical reaction” with visible light 2 Demo
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    Photchemistry in the Stratosphere: UV and ozone O O 3 + h + h ν(280-320 ν(280-320 nm) nm) O O 2 + O + O · · O O 2 + O + O · · O O 3 Ozone in upper atmosphere absorbs in the UV-B range. It is then spontaneously regenerated from products. Ozone protects us from damaging radiation.
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  How do we see stuff that is colored? We don’t see 
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StudentLecture_15 - Lecture 15 10/20/2009 Lab:...

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