Page 212 - Fundamentals of Air Pollution

178 12. Atmospheric Chemistry

2. Equation (12-17) describes the steady-state [O 3 ] in the presence of solar radiation. If Jtj =
1
1
J
0.3 min" and k 3 = 30 pprrT min' , which sets of conditions are consistent with [O 3] =
0.1 ppm?
[NO] (ppm) [N0 2] (ppm)
0.005 0.050
0.125 0.125
0.047 0.47
0.47 0.047
0.001 0.010
3. What does the answer to question 2 indicate about the functional dependence of ozone
concentrations on the absolute magnitude of [NOJ = [NO] + [NO 2]?
4. How are free radicals formed, and why are they so reactive?
5. From Fig. 12-6, how many molecules of NO can be oxidized to NO 2 by the reaction of one
OH free radical with one propene molecule?
6. List various classification approaches used to account for hydrocarbon reactivity.
7. Classify the compounds in Table 12-4 into precursors (reactants) and products of atmo-
spheric reaction processes.
8. List two photoacceptors in addition to nitrogen dioxide that provide an initial source of
free radicals.
9. Describe the role of hydrocarbons in photochemical oxidant formation.