class16_w08

class16_w08 - Chapman cycle O2 2O Formation of O3 hv ka O2...

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Chapman cycle O 2 2O O 2 + O + M O 3 + M O 3 O 2 + O k a k b k c k d Formation of O 3 Breakdown of O 3 hv hv
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Chapman cycle O 2 2O O 2 + O + M O 3 + M O 3 O 2 + O O 3 + O 2 O 2 k a k b k c k d Eliminating [O]: [O 3 ] ss /[O 2 ] ss = [M] 0.5 {k a k b /k c k d } 0.5 Eliminating O 3 : [O] ss = {k a k b /k c k d } 0.5 / [M] 0.5 Given [M] dependence, relative ozone to oxygen concentrations should decrease as the atmosphere thins, at higher elevations. Given that k a depends on high-energy photons, O 3 level will also decrease at low altitudes the mechanism predicts the existence of an ozone layer
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Chapman cycle O 2 2O O 2 + O + M O 3 + M O 3 O 2 + O O 3 + O 2 O 2 k a k b k c k d Eliminating [O]: [O 3 ] ss /[O 2 ] ss = [M] 0.5 {k a k b /k c k d } 0.5 Eliminating O 3 : [O] ss = {k a k b /k c k d } 0.5 / [M] 0.5 Concentration of O is predicted to be inversely dependent on [M], as found by experiment
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Chapman cycle O 2 2O O 2 + O + M O 3 + M O 3 O 2 + O 3 2 k a k b k c k d Formation of O 3 Breakdown of O 3 Ozone destruction by catalysts has some built-in correction: as O 3 is depleted, more UV penetrates, so more O is generated at lower altitudes (rxn 1)
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This note was uploaded on 08/06/2008 for the course CHEM 123 taught by Professor Perona during the Winter '08 term at UCSB.

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class16_w08 - Chapman cycle O2 2O Formation of O3 hv ka O2...

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