QUESTION 1
(20)
a) Use the biogeochemical cycle of sulphur to illustrate the definition of environmental
chemistry.
(10)
· b) Carbon dioxide is one of the greenhouse gases which is largely responsible for global
warming.
i. Explain how carbon dioxide contributes to global warming.
(2)
ii. Discuss4 impacts of global warming on the ecosystem.
(4)
iii. Suggest adaptation approaches to the global warming problem.
(4)
QUESTION 2
(20)
a) With the aid of chemical reactions, explain how acid mine drainage (AMO) is formed.
(10)
b) Discussthe ecological impact of acid mine drainage.
(5)
c) Explain how AMO can be prevented.
(5)
QUESTION 3
(20)
a) Briefly describe the main categories of atmospheric chemical reactions.
(6)
b) What is stratospheric ozone depletion?
(2)
c) Describe, with appropriate reactions, how the depletion in (a) occurs using
chlorofluorocarbon (CFC)as a starting point.
(4)
d) Differentiate between the following terms:
i. Primary and secondary pollutants
(2)
ii. Direct and Indirect sources
(2)
iii. Point and Area sources
(2)
iv. Classical smog and photochemical smog
(2)
QUESTION 4
[20)
a) Discussthe ecological effect of the following and explain how to mitigate.
(15)
i. Eutrophication
ii. Acid rain
iii. Pesticides
iv. Photochemical smog
V. Acid mine drainage
Environmental Chemistry (ENC702S)
2nd Opportunity January 2024
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