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Sch 0103: Chemistry Question Paper

Sch 0103: Chemistry

Course:Diploma In Architecture

Institution: Jomo Kenyatta University Of Agriculture And Technology question papers

Exam Year:2012

JOMO KENYATTA UNIVERSITY OF AGRICULTURE AND TECHNOLOGY
UNIVERSITY EXAMINATIONS 2012/2013
EXAMINATION FOR THE DIPLOMA IN ARCHITECTURE
SCH 0103: CHEMISTRY
DATE: AUGUST 2012 TIME: 1.5 HOURS
INSTRUCTIONS: ANSWER QUESTION ONE AND ANY OTHER TWO QUESTIONS
QUESTION ONE
Sulphur dioxide (SO2) is one of major primary air pollutants emitted into the atmosphere, explain;
a. Four characteristics sulphur dioxide. [2 marks]
b. The manufacture of sulphuric acid (H2SO4) through contact process. [5 marks]
c. Four effect of sulphur dioxide by-product i.e (acid rain) [2 marks]
d. Calculate the number of moles of sulphur dioxide (SO2) used to react sulphuric acid (H2SO4) given that standard alkaline of sodium hydroxide (0.1m NaOH) of i.e
2NaOH + H2SO4 ?Na2.SO4 + 2H2O [10 marks]
e. Differentiate between primary air pollutants and secondary air pollutants. [1 mark]
QUESTION TWO

The above apparatus can be used to determine SO2 concentration in any given sampling.
a. Name the two (2) types of instruments used in flow movement. [2 marks]
b. Name the three collection methods used to collect SO2 [2 marks]
c. Why is SO2 collected by use of either H2O or H2O2 [1mark]
d. Explain two (2) characteristics of air intake and transfer component. [2 marks]
e. Explain how to determine carbon monoxide (CO) concentration by use of gas- chromatography method. [10 marks]
f. Give two (2) effect of carbon monoxide to ecosystem. [2 marks]

QUESTION THREE
i. Explain the formation of photochemical smog and its implications to the environment.
[2 marks]
ii. Explain how carbon monoxide (CO) results into death in human being. [2 marks]
iii. Differentiate the following;
a. Pollution and pollutants [1mark]
b. Global warning and green house effect. [1 mark]
c. Atmosphere and biosphere. [1 mark]
iv. The important retarder in cement manufacturing. [1 mark]
v. The four (4) uses of C.F.C’s in day to day life. [4 marks]
vi. The three major properties of C.F.C’s substitutes. [3 marks]
vii. Explain the mechanism through which chloroflorocarbon e.g (CCL2f2) is involved in depletion or destruction of ozone (O3) layer. [5 marks]

QUESTION FOUR
i. Water being abundant on earth, only 0.7% is fresh water. This 0.7% fresh water is enough for human consumption, however, there are factors which make it not enough for human consumption. Explain. [5 marks]
ii. Name and define the two methods used in formation of synthetic/manmade polymers.
[4 marks]
iii. Name three uses of modern ceramics. [3 marks]
iv. What is acid imposition/deposition. [2 marks]
v. Name the two methods of acid deposition [2 marks]
vi. Explain the difference between the two methods name above in question 4(v)
[4 marks]
QUESTION FIVE
Cement has been a major binding tracenal in building and construction industry. Explain;
a. Why cement is a key binding tracerial in construction. [3 marks]
b. Two difference between dry and wet method in cement manufacturing. [2 marks]
c. Explain the purpose of the following in cement clinker
i. Tricalcium aluminate. [2 marks]
ii. Tricalcium silicate. [2 marks]
iii. Dicalcium silicate. [2 marks]
d. Explain how glass is formed. [2 marks]
e. Name four (4) types of glasses. [2 marks]
f. Name three factors which determine the serenity of a pollutant. [3 marks]
g. When does a natural form of pollution become a pollutant. [2 marks]

Sch 0103: Chemistry Question Paper

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