October 17th, 2008 Chemistry 331, Exam 2 KEY 50 minutes
Part A: Mixed bag, 5 points each.
1) List three primary tropospheric pollutants, their major sources (stationary or mobile), and one
secondary pollutant that forms from each of them.
Primary Pollutant Major Source Secondary Pollutant
NO mobile HNO3
SO2 stationary H2SO4
VOC’s mobile aldehydes, or organic radicals
2) True or False.
Ozone is considered a primary tropospheric pollutant. T F
In photochemical smog, oxidation of NO occurs primarily through reaction with O3. T F
Fission of a nucleus always results in a release of energy. T F
Carbonate minerals do not result from the weathering of primary minerals. T F
When soils are acidified, carbonate buffering typically runs out before CEC buffering. T F
3) How does NO form during combustion in an automobile engine? What is the main control on NO
emissions from automobiles?
N2 + O2 + heat
Æ
2 NO
The 3-way catalytic converter is the control on NO (reduction to N2)
4) (Circle the correct choices) Modern nuclear power plants obtain energy from (fusion/ fission) of
(235U / 238U), and control rods are used to limit the number of (neutrons / protons) reacting.
5) Identify the mobile charge in the electrolyte for each type of fuel cell specified.
Molten carbonate fuel cell: CO32-
Alkaline fuel cell: OH-
Phosphoric acid fuel cell: H+
Solid oxide fuel cell: O2-
6) In soils, CEC can arise from pH dependent charge. The major source of this type of charge is
natural organic matter (acids) , and the charge increases as pH increases .
