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Cork Institute of Technology
Bachelor of Engineering (Honours) in Mechanical Engineering – Stage 1
(NFQ – Level 7)
Summer 2007
Chemistry
(Time: 3 Hours)
Instructions Answer any FIVE questions. All questions carry equal marks.
Examiners: Mr. S.P. McCarthy Mr. P. Clarke Prof. M. Gilchrist
Q1. Discuss environmental pollution under the headings: (a) Bioconcentration and biomagnification of pesticides. (6 marks) (b) Energy and the environment. (6 marks) (c) Waste management (8 marks)
Q2. (a) For the following reaction: 2Cℓ2 (g) + 2 H (^) 2 O ( g ) = 4 HCl ( g ) + O 2 ( g )
∆H = 96 kJ Calculate the oxygen-oxygen bond energy.
Useful data Bond Energy Cℓ - Cℓ 243 kJ O - H 459 kJ H - Cl 432 kJ (10 marks)
(b) Discuss the experimental estimation of the enthalpy of neutralisation of sodium hydroxide solution and hydrochloric acid solution. (10 marks)
Q3. (a) Explain the terms; (i) pH (ii) Buffer solution (iii) Ionic product of water (6 marks)
(b) Calculate the percentage pH change when 0.01 moles of sodium hydroxide are added to 100 cm^3 of pure neutral water. (6 marks)
(c) Calculate the percentage pH change when 0.01 moles of sodium hydroxide are added to 100 cm^3 aqueous solution of 0.5 M ethanoic acid and 0.5 M sodium ethanoate. (8 marks) Useful data: K diss for ethanoic acid = 1.8 x 10 - K w = 1 x 10-14^ at S.T.P.
Q4. Write concise notes on: (a) Hardness of water and its experimental measurement. (10 marks) (b) Colourimetric analysis of a permanganate solution. (10 marks)
Q5. (a) Calculate the energy change per gram of reactant for the following nuclear fusion reaction: (^23592) U → (^9038) Sr + (^14458) Ce + 01 n + (^4) − (^01) e Useful data: Mass of 23592 U = 239.9934 a.m.u. Mass of (^9038) Sr = 89.8864 a.m.u. Mass of 14458 Ce = 143.8816 a.m.u. Mass of 01 n = 1.0087 a.m.u. Mass of (^) −^01 e = 0.00055 a.m.u.
Avogadro’s Number = 6.02 x 10^23 Velocity of Light = 3 x 10 8 ms-1^ (12 marks)
(b) Write a concise note on nuclear reactors. (8 marks)
