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Tec 112: Chemistry For Engineers Question Paper
Tec 112: Chemistry For Engineers
Course:Bachelor Of Technology In Chemical And Process Engineering
Institution: Moi University question papers
Exam Year:2009
MOI UNIVERSITY
SECOND SEMESTER EXAMINATION
TEC 112; CHEMISTRY FOR ENGINEERS
This paper consists of 100 marks
Answer any five questions
Candidates attempting more than five questions should note that only the first five answered questions would be marked.
Question 1
a. Give the essential features of Rutherford’s model of a nuclear atom. What are its drawbacks? (7mks)
b. Give the concept of shell, sub shell and orbital in an atom. Name the sub shells and corresponding orbitals for principal quantum number 4. (10mks)
c. Give the electronic configuration of the following:
Fe (atomic number 26)
O
Na (3mks)
Question 2
a. A particular type of brass contains elements Cu, Sn, Pb and Zn. A sample weighing 1.713 g is treated in such a way as to convert Sn to 0.245 g tin oxide, the Pb to 0.115 lead sulphate and the Zn to 0.246 Zinc dichromate. What is the percent, by mass of each element in the brass? (10mks)
b. What are Lewis symbol, Lewis structures and Resonance Hybrid structures? Give two examples of each. (10mks)
Question 3
a. Give the Bronsted-Lowry theory of acids and bases. Use a reaction example to explain the theory. (4mks)
b. Explain the term conjugate acid base pairs. Give four examples. (6mks)
c. What is a buffer system? Show how such a system can be used to maintain a value pH in the acidic and basic ranges of pH. (10mks)
Question 4
a. Give five different reactions that can be used to explain corrosion. (10mks)
b. Explain the following mechanisms of corrosion;
i. Metal ions concentration cells corrosion
ii. Oxygen concentration cells corrosion. (4mks)
c.
i. Explain how coating of steel (F) with copper (Cu) inhibits rusting. What happens to when zinc (Zn) is used as the coating metal? (3mks)
ii. Explain cathodic protection. (3mks)
Question 5
a. How can the following be obtained:
i. Bromoethane (ethyl bromide) from ethane (ethylene). (2mks)
ii. 2-bromopropane (isopropyl bromide) from propene (propylene) (2mks)
iii. 1,2 propanediol (propylene glycol) from propene (propylene) (2mks)
iv. Vinyl chloride from ethyne (acetylene) (2mks)
v. Propyne (methyl acetylene) from ethyne (acetylene) (2mks)
b.
i. Give any two preparation reactions of alcohols. (5mks)
ii. Give the following reactions:
Dehydration of 2-propanol (2.5mks)
Substitution reaction of polyhydric alcohol (glycerol) with nitric acid. (2.5mks)
Question 6
a. Give the structural formula of the following compounds:
Methyl phenyl ether
Methyl Phenyl ketone (acetophenone)
Ethyl methyl ketone
Ethanedioic acid (oxalic acid)
Diphenyl amine (5mks)
b. Give the preparation reaction from the following:
Methyl ethyl from methanol (Williamson synthesis) (3mks)
Propanone (acetone) from 2-propanol (isopropyl alcohol) (2mks)
c. Give the reactions when ethanoic acid (acetic acid) is made to react with:
i. Ammonium hydroxide (2mks)
ii. Sodium hydroxide (2mks)
iii. Phosphorous (v) chloride (3mks)
iv. Phosphorous (V) oxide (3mks)
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