Chemistry 2210A/B Study Guide - Final Guide: Polar Stratospheric Cloud, Tropospheric Ozone, Fractional Distillation
Document Summary
Molecules and bonds absorb at different frequencies of light. Wavelengths shorter than 120 absorbed by o2 and n2. O2 above stratosphere absorbs most uv light from 120-220 (c) O3 absorbs light in 220-290 range (all of c, very little b) Shorter the wavelength, more absorption will not reach earth. Ozone creation and destruction in the stratosphere; the chapman cycle (don"t memo rize equations; just what is happening?) First reaction: o2 2o (absorb uv-c, shortest wavelength, highest energy: above stratosphere ! filters most uvc before reach strato, mostly o. Second reaction: o + o2 o3 + heat: in stratosphere, oxygen mainly molecular. Third: o3 absorbs uva o + o2. Fourth: o3 + o 2o2 (small extent, high ea) Cycle is naturally occurring during daylight hours, and occurs in stratosphere. O3 + x xo + o2. Xo + o o2 + x. X + o3 xo + o2. X" + o3 x"o + o2.
