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

Chemistry

Description: 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, Hydrogen Bond
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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 14
7
14
6+
(ii) ..........FNe 19
9
19
10 +
(iii) ........ThU 234
90
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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