Environmental Chemistry 3

Which of the following is NOT a source of CO?

• Incomplete combustion

• Biodegradation of methane

• Photodegradation of methane

• Attack of VOCs by OH radicals

An example of anthropogenic VOC is

• Formaldehyde

• Methylbutanol

• 3-carene

• Limonene

How do photochemical oxidants form?

I. From lightning

II. From reactions of SO₂

III. From reactions of NO₂

IV. From reactions with NO·

• I, II and III

• I, III and IV

• II, III and IV

• I, II, III and IV

What is the condition required for initiation of photochemical smog?

• Null cycle

• Photolysis of water

• Removal of ozone

• Quenching of OH radicals

Identify a FALSE statement about polychlorinated dibenzo compounds.

• They have many chlorine atoms attached

• They are xenobiotic

• They are pyrogenic

• They are geogenic

Identify the CORRECT matching.

                      I.  RCO· - alkoxyl radical

                     II.  RCOOO· - acylperoxyl radical

                    III.  RO· - peroxyl radical

                   IV.  HOO· - hydroperoxyl radical

• I and II

• I and III

• II and IV

• II, III and IV

CH₃COO₂· + NO₂· + M --> CH₃COOONO₂ + M is an example of

• Initiation reaction

• Termination reaction

• Photolysis reaction

• Propagation reaction

What does NOT happen on polar stratospheric clouds?

• The release of Cl₂

• The depletion of N₂O₅

• The trapping of Cl radicals

• The formation of nitric acid

Which statement about indoor air pollution is FALSE?

• Tobacco smoke is a type of indoor air pollutant

• It is caused entirely by indoor-source air pollutants

• Carbon and soot are indoor particulate matters

• Indoor heating can produce NOx

Given the K_sp of PbBr₂ is 6.3 x 10^-6, calculate the solubility of PbBr₂ in water.

• 0.01865 mol/L

• 0.00034 mol/L

• 0.00063 mol/L

• 0.01178 mol/L