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Sch 2108: Chemistry Ii Question Paper

Sch 2108: Chemistry Ii

Course:Bachelor Of Science In Electrical And Electronics Engineering

Institution: Dedan Kimathi University Of Technology question papers

Exam Year:2013

DEDAN KIMATHI UNIVERSITY OF TECHNOLOGY
UNIVERSITY EXAMINATIONS 2012/2013
YEAR ONE SEMESTER II EXAMINATION FOR DEGREE OF
BACHELOR OF SCIENCE
ELECTRICAL AND ELECTRONICS ENGINEERING
SCH 2108: CHEMISTRY II
Special/supplementary examination
DATE: JULY 2013 TIME: 2 Hours
INSTRUCTIONS: Answer Question ONE and any other TWO questions
QUESTION ONE (30 MARKS)
a) Distinguish between (4 marks)
(i) Aliphatic and alicyclic compounds
(ii) Thermoplastic and thermosetting
b) Explain the meaning of the following terms (5 marks)
i) Unsaturation
ii) Denaturation
iii) Vulcanization
iv) Saponification
v) Carbohydrates
c) Briefly, explain the term octane number. How can octane number of petrol be
increased (3 marks)
d) Give the IUPAC name of the following molecules (3 marks)
CH2 CH
NH2
CO2H
i) (C2H5)2 CH CH(Cl) CH3
ii) CH3 CH2 CH2 CH2 C(C2H5)2 CH(OH) CH3
iii)
e) Write the functional group in each of the following organic compounds
(2 marks)
(i) Aldehydes (ii) Amides
f) Give the mechanism for the chlorination of methane in presence of UV light
(3 marks)
g) Distinguish between (4 marks)
(i) Galvanic cell and electrolytic cell
(ii) Fibrous protein and globular protein
h) Write the structural formulae for three compounds represented by the molecular formulae C4H9OH (3 marks)
i) Write the chemical equation for the reaction between
1. Ethene and potassium permanganate
2. Propene and hydrogen bromide in presence of organic peroxide
3. Sodium propanoate and soda lime
(3 marks)
SECTION B. ATTEMPT TWO QUESTION OUT OF THE FOUR
QUESTION TWO (20 MARKS)
a) State Markownikoff’s rule (1 marks)
b) Give the structural formulae of the following compounds (3 marks)
(i) Sodium hexanoate
(ii) 2-methylpentan-1,4-diol
(iii)Trinitrotoluene
c) Polymerized styrene has different uses.
State one use of its homopolymer (1 marks)
d) State the effect of polymerizing it with the following (3 marks)
(i) Butadiene
(ii) Acrylonitrile
(iii)Maleic anhydride
e) Distinguish between (4 marks)
(i) Chain-reaction polymerization and step-reaction polymerization
(ii) Hard and soft water
f) Explain the following observations (3 marks)
(i) Ethanol has a higher boiling point than ethane
(ii) The melting point of hexane is higher than that of heptane
(iii)Ethene gas is collected over water after dehydration of ethanol
g) State two uses of aliphatic nitro compounds (1 marks)
h) Briefly describe transesterification of fats and state two uses the fats (4 marks)
QUESTION THREE (20 MARKS)
a) State two advantages of non-soapy over soapy detergents (2 marks)
b) Explain the meaning of the following terms (4 marks)
(i) Isomerism
(ii) Catenation
(iii)Chiral molecule
(iv) Mutarotation
c) Given the standard reduction potentials below
Cu+2 +2e?Cu +0.34V
Zn+2 +2e ?Zn - 0.76V
Fe+3+e ?Fe+2 -0.44V
Ce+4 +e ? Ce+3 +1.76V
(i) Identify the strongest oxidizing agent (1 mark)
(ii) State two uses of electrode potentials (1 marks)
(iii)Predict the cell reaction that gives the highest e.m.f (2 marks)
d) Polyethylene is produced by the polymerization of ethylene using the famous Ziegler-Natta catalyst.
(i) Identify the Ziegler-Natta catalyst (1 marks)
(ii) Write a mechanism for this polymerization (5 marks)
(iii)State two advantages of polymerization with Ziegler-Natta catalyst over free- radical polymerization (2 marks)
e) Distinguish between nitrification and denitrification (2 marks)
QUESTION FOUR (20 MARKS)
a) Explain the meaning of the term homologous series (1 marks)
b) Briefly explain the meaning of the following terms (3marks)
(i) Catalytic isomerisation
(ii) Catalytic alkylation
(iii)Catalytic reforming
c) State three properties of amino acids (3marks)
d) Draw the structure of alkyl benzenesulphonate and explain how the cleaning process occurs (4 marks)
e) Name the organic products of the reaction of but-2-ene with each of the following reagents (3 marks)
(i) Hydrogen bromide
(ii) Bromine dissolved in trichloromethane
(iii)A dilute alkaline solution of potassium permanganate
f) Distinguish between homopolymer and copolymer (2 marks)
g) An alkene X on ozonolysis, gives CH3CH2CHO and HCHO. What is the structure of X? What products would it form, if it is oxidised with acidic potassium permanganate solution (4 marks)
QUESTION FIVE (20 MARKS)
a) i. Name and draw the structures of all the C5H12O alcohols. (3 marks)
ii. Explain why aldehydes are more reactive and ketones. (3 marks)
b) Explain the following
i). Alcohols are soluble in polar solvents while their corresponding alkanes are not. (2 marks)
ii). Solubility of alcohols in polar solvents decrease with increase in carbon chain. (2 marks)
c) Using relevant equations, explain how you would distinguish between primary, secondary and tertiary alcohols. (6 marks)
d) i) Explain how you would distinguish between methanoic and ethanoic acids.
(2 marks)
ii) Outline the necessary reagents and conditions for carrying the following reaction
CH3CH2-OH CH3COOCH2CH3 + H2O (2 marks)

Sch 2108: Chemistry Ii Question Paper

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