Final test lecture series C8621 “Trends and advances in atmospheric and total
environmental chemistry” MU, fall semester 2011, (G. Lammel), 15.12.2011
number of credit points allocated: 2
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1. Chemical reactions: Give the time laws for the formation of products B and C formed from
one educt, A, i.e. A B + C,
a) What is the unit of the reaction rate coefficient, k ? What is the unit of the formation rate,
dcB/dt ?
b) In case the reaction would be a photolysis: How is the photolysis rate coefficient defined /
which parameters go into the photolysis rate coefficient ? (mathematical terms or words)
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2. Aldehydes are formed in the atmospheric chemistry of hydrocarbons.
a) Formulate the reactions leading to an aldehyde, starting from ethane (C2H6) !
b) What is the oxidation state of the 2 C atoms in the aldehyde ?
c) What is a hydrate of an aldehyde and how does it influence the phase equilibrium between
gas and aqueous phase (for example in clouds) ? (chemical formulae or words)
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3. Hydrocarbons contribute ca. 10-6
to tropospheric air.
a) In the presence of nitric oxide (NO) nitrogen dioxide (NO2) is formed in
hydrocarbons' atmospheric chemistry. What is the significance of NO2 for
tropospheric ozone (O3) ? (formulate reaction(s) or explain by words)
b) What is happening in the absence of nitrogen oxides (NO and NO2) in the
hydrocarbons' atmospheric chemistry ? (formulate reactions or explain by words)
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4) Formation of acidity in the atmosphere
a) What is the definition of pH ?
b) Give two examples for formation of acidity in the atmosphere (reactions or short sentences
explaining the chemistry)
c) Describe the dissociation of SO2 in cloudwater (chemical reactions / equilibria)!
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