Water Pollution - Chemistry - Past Exam, Exams for Chemistry. Aliah University
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jojy1 April 2013

Water Pollution - Chemistry - Past Exam, Exams for Chemistry. Aliah University

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Main points of this pas exam are: Water Pollution, Nuclear Fusion, Kinetic Theory of Matter, Cracking of Hydrocarbons, Radioactive Dating, Ionic Product of Water, Atomic Mass of Chlorine, Ethanoic Acid, Buffer Solutions,...
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Cork Institute of Technology Bachelor of Engineering (Honours) in Structural Engineering - Stage 1

(NFQ – Level 8)

Autumn 2007 Chemistry

(Time: 3 Hours) Instructions Answer any FIVE questions. All questions carry equal marks.

Examiners: Mr. S. P. McCarthy Prof. P. O Donoghue Mr. P. Anthony

Q1. Discuss environmental pollution under the headings:

(a) Water pollution (8 marks)

(b) Incineration (6 marks)

(c) Energy and the environment (6 marks)

Q2. (a) Complete the following radioactive decay reactions:

(i) ...........NC 147 14

6 +→

(ii) ..........FNe 199 19 10 +→

(iii) ........ThU 23490 238 92 +→ (6 marks)

(b) Write concise notes on:

(i) Nuclear fission (7 marks)

(ii) Nuclear fusion (7 marks)

Q3. Write concise notes on the following:

(a) Kinetic theory of matter (8 marks)

(b) Buffer solutions (6 marks)

(c) Fuel cells (6 marks)

2

Q4. Write concise notes on the following:

(a) Cracking of hydrocarbons (6 marks)

(b) Hydrogen bond (7 marks)

(c) Radioactive dating (7 marks)

Q5. (a) Explain:

(i) Ionic product of water, Kw

(ii) pH

(iii) Buffer solution (6 marks)

(b) Calculate the pH of a solution made by adding 0.001 moles of sodium hydroxide to

100cm3 of pure water. (6 marks)

(c) Calculate the pH change of a solution consisting of 100cm3 of 0.1 M Ethanoic acid and

0.1 M Sodium Ethanoate when 0.001 moles of sodium hydroxide are added to the

solution.

Useful data: Ka, Ethanoic acid = 1.8 x 10-5 (8 marks)

Q6. (a) State Faradays Laws of electrolysis. (4 marks)

(b) Explain the terms:

(i) electrolysis

(ii) electrochemical series (6 marks)

(c) What volume of chlorine gas can be produced at standard temperature and pressure by

the electrolysis of molten sodium chloride at a current of 0.6 ampere for thirty minutes?

(10 marks)

Useful data:

Atomic mass of chlorine = 35.5 a.m.u.

Molar volume = 22.4 litres at S.T.P.

1 Farad = 96,500 coulombs

Q7. Write notes on the following:

(a) Metallic corrosion and its prevention. (8 marks)

(b) Semi conductors (6 marks)

(c) Surface tension (6 marks)

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