Chemistry and Human Environment_Ridge_Date_022310

Chemistry and Human Environment_Ridge_Date_022310 - Ozone I...

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Good up high Filters out ultraviolet radiation from the sun Bad nearby Damage to respiratory system, etc Ozone Measurements in the Atmosphere Ozone in the atmosphere is measured as the total amount in a vertical “column” at a given latitude and longitude Measured in Dobson Units (DU) 1 DU ~ 1 ppb = .001 ppm (1 ppb is the average across the entire “column” of the atmosphere” Average ozone concentration is 320 DU (.32 ppm) Maximum concentration in “ozone layer” ~ 12 ppm Recall that the criteria standard for ozone is .075 ppm, 8 hour average Ozone Formation Energy + 3 O 2 2 O 3 Energy must be absorbed (endothermic) for this reaction to occur Ozone is an allotropic form of oxygen o An allotrope is 2 or more forms of the same element that differ in their chemical structure and therefore their properties o Element: Oxygen, Allotrope: O 2 , O 3 o Element: Carbon, Allotrope: graphite, diamond, buckminister fullerenes Questions we want to answer: Molecular oxygen (O 2 ) and ozone (O 3 ) are two forms of the same element
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Chemistry and Human Environment_Ridge_Date_022310 - Ozone I...

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