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Tec Ii2 Question Paper

Tec Ii2

Course:Bachelor Of Technology In Chemical And Process Engineering

Institution: Moi University question papers

Exam Year:2010

MOI UNIVERSITY
UNIVERSITY EXAMINATIONS 2010/2011 ACADEMIC YEAR
FIRST YEAR SECOND SEMESTER EXAMINATIONS FOR THE DEGREE OF BACHELOR OF TECHNOLOGY IN CHEMICAL AND PROCESS ENGINEERING
COURSE CODE: TEC 112
COURSE TITLE: CHEMISTRY FOR ENGINEERS

INSTRUCTIONS

1. This paper consists of 100 marks
2. Answer any five questions .Candidates answering more than five questions should note that only the first five questions will be marked

Question 1

(a) Describe Rutherford`s atomic model based on his observations on scattering of alpha particles. Indicate the drawbacks of the model [10 marks]
(b) Describe Bohr`s atomic model and give it`s merits. [10 marks]

Question 2

(a) Give the electronic configuration of:
(1) O
(2) Cu
Comment on the electronic configuration of copper[6 marks]
(b)Describe characteristic of noble gases in view of their electronic configurations [4 marks]
(c)What is the empirical formula for the rodenticide which consists of 74.01 %C,5.23%H and 20.76% O? [10 marks]

Question 3

(a)Distinguish between the nature of bonds formed when sodium chloride and hydrogen chloride gas are formed from their elements in the gaseous state [4 marks]
(b)Comment on the octet rule in the formation of Hcl (g ) and also on its polar nature [8 marks]
(c)How is the magnitude of charge displacement measures in polar covalent bonds [4 marks]
(d)Define bond length and bond energy. Use the bond energies to calculate the enthalpy change in the formation of ammonia gas from nitrogen and hydrogen gas [8 marks]

Question 4

(a) Discuss isomerism in alkanes and alkenes [10 marks]
(b) What happens when the following is carried out(give reactions)
I. Acetic acid is reacted with sodium carbonate. The sodium salt of carboxylic acid is then heated with solid sodium hydroxide
II. Propyl bromide is heated with alcoholic caustic potash
III. Propene is oxidized by potassium permanganate (vii)
IV. Ethyne reacts with hydrochloric acid [2.5x4 =10]

Question 5

(a) Give a preparation reaction for the following:
i. Isopropyl alcohol from acetone
ii. Phenol from benzene
iii. Acetone from isopropyl alcohol
iv. Acetic acid from ethyl alcohol [2.5x4= 10]
(b) Give the structural formula of the following:
i. n-Butane
ii. 2-methyl-2-butene
iii. Isopropyl bromide
iv. Cyanoethylene
v. 3-bromotoluene
vi. Naphthalene
vii. Phenol
viii. Benzaldehyde
ix. Benzoic acid
x. Diphenyl amine [1x10= 10]

Question 6

(a)Explain with the help of suitable examples ,the term neutralization according to Arrhenius theory. [4 marks]
(b)Define a buffer solution. Explain the working f a buffer solution containing ethanoic acid and sodium ethanoate. [7 marks]
(c)Give the method of cathodic protection to minimize corrosion [5 marks]
(d)Giving two examples, define conjugate acid-base pairs [4 marks]

Tec Ii2 Question Paper

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