lecture25_chem110_sas - Chapter 18: Atmosphere and...

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Chapter 18: Atmosphere and Environment CH110 FA11 SAS 1 Prepare for Recitation October 27 th ALEKS Objective 9 due October 25 th ANGEL Quiz 9, October 27 th Lecture 25: October 19 th Lecture 26: October 21 st Lecture 27: October 24 th Read: Ch. 18.1-18.4,5.5,11.3-11.6 Additional Preparation: BLB 18 : 9,11,15,29,69 Packet 18 : 1-3 BLB 11 : 31,33,37,39,43,47,50; Packet 11 : 5-13
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CH110 FA11 SAS 2 By the end of Today’s Lecture you should know: Chemistry in the upper atmosphere Chemistry in the lower atmosphere Sulfur compounds and acid rain Nitrogen oxides and smog Water vapor, CO 2 , and climate KEY QUESTIONS: THE BIG PICTURE Chapter 18: Atmosphere and Environment What gases are found in the Earth’s atmosphere? What properties change in the atmosphere as elevation changes? What reactions are possible in the Earth’s atmosphere? Remember: macroscopic properties come from microscopic origins How does atmospheric chemistry impact the environment? How do human activities impact atmospheric chemistry?
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Composition of Earth’s Atmosphere CH110 FA11 SAS 3 N 2 78.084 O 2 20.948 Ar 0.934 CO 2 0.033 % by volume > 99% ppm = X i = the mole fraction of component i For example, ppm of CO 2 in atmosphere: Expressing concentration in parts per million (ppm):
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Atmospheric Profiles CH110 FA11 SAS 4 Temperature Profile of the Atmosphere: At high temperature is the average KE of molecules high or low? Pressure Profile of the Atmosphere: Low pressure means fewer molecular collisions. Do chemical reactions occur more or less frequently?
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Important Chemistry in the Upper Atmosphere CH110 FA11 SAS 5 Photoexcitation: NO 2 (g) NO 2 * (g) h ν Photodissociation: O 2 (g) h ν 2 O (g) At 400 km, only 1% of oxygen is in the form of O 2 Photoionization: N 2 (g) N 2 + (g) + e - h ν Photochemistry:
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Practice Problem CH110 FA11 SAS 6 The bond dissociation energy for O 2 (g) is 495 kJ/mol. What is the maximum wavelength photon capable of photo- dissociating O 2 ? A. 242 nm B. 350 nm C. 428 nm D. 495 nm E. 518 nm
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Ozone CH110 FA11 SAS 7 O O O : • How many resonance forms? • Less stable than O
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This note was uploaded on 01/18/2012 for the course CHEM 110 taught by Professor Hofmann,brucerob during the Fall '08 term at Pennsylvania State University, University Park.

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lecture25_chem110_sas - Chapter 18: Atmosphere and...

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