Introduction To Analytical And Organic Chemistry Question Paper
Introduction To Analytical And Organic Chemistry
Course:Bachelor Of Science In Computer Engineering
Institution: Kenyatta University question papers
Exam Year:2009
KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2009/2010
FIRST SEMESTER EXAMINATION FOR THE DEGREE OF BACHELOR OF
SCIENCE IN COMPUTER ENGINEERING
SCH 105:
INTRODUCTION TO ANALYTICAL AND
ORGANIC
CHEMISTRY
-------------------------------------------------------------------------------
=================================================================
DATE:
MONDAY 28TH DECEMBER 2009
TIME: 2.00 P.M. – 4.00 P.M.
INSTRUCTIONS
Answer all Questions in spaces provided.
Statistical tables attached
Q1. (a)
Differentiate between the following terms
(8 marks)
i)
Accuracy and precision
ii)
Variance and coefficient of variation
iii)
Random and systematic errors
iv)
Contamination and interference
(b)
State one reason for each of
the
following
(3
marks)
i)
Why does analyst pool data?
ii)
s is better than d¯ as a measure of precision
iii)
Why analyst should keep data?
Page 1 of 6
(c)
State any five factors to consider before carrying out any chemical analysis.
(5 marks)
(d)
State
two
aims
of
analysis
(2
marks)
(e)
List
two
types
of
sampling.
(2
marks)
Q2. The replicate results below were obtained as concentration in g/l of albumin in blood
of two HIV infected adults
Case
1: 37, 39, 42, 38
Case
11: 44, 40, 36, 45, 41
i)
Check if the precision of the results differ at 95% confidence level.
(4 marks)
(ii)
Determine the confidence limits for the results of case II.
(2 marks)
(iii)
Assuming the expected concentration in case 1 should be 40 g/l, is there
evidence of systematic error in the results 95% confidence leve? (3 marks)
(iv)
Do the means of the two analyses differ significantly at 95% confidence level?
(4 marks)
(v)
Use Q-test to check if the value 36 is an outlier in the Case 11 measurement.
(2 marks)
Q3. (a)
Give systematic (IUPAC) names of each of the organic compounds indicating
stereochemistry
where
possible.
(6
marks)
Cl
(i)
(ii)
Cl
Br
(iv)
H
C H
(v)
2C C C
CH3
OH
Page 2 of 6
(b)
Draw structures of each of the following indicating stereochemistry where
appropriate.
(6
marks)
(i)
Chloroocta(3,5)diene
(ii)
1-chloro-3-ethyl-1,2-dimethylcyclobutane
(iii)
5-Cyclopropyl-2-methyl-3-Heptyne
(iv)
Cis-Bromocyclohexanol
(c)
Determine the formal charge of O and N in the following compound.
[N = 5; O = 6]
(3 marks)
O
N O
Q4. (a)
Quantitative analysis of quinone showed the presence of C, H and O.
Combustion of 0.105 g 0f quinone gave 0.257 g of CO2 and 0.035g of H2O. If
the molecular of quinone is 108 g. [C = 12.011; H = 1.008; O = 15.999].
Calculate
the
molecular
formula
of
quinone.
(7
marks)
(b)
Draw the structural formulas of all isomeric compounds with molecular
formula
C5 H12
(3 marks)
(c)
You are provided with the following structure of an organic compound 1.
OH
a
f
d
b
1
(i)
Draw and label all the functional groups in compound 1.
(2 marks)
Page 3 of 6
(ii)
Which of the labeled carbon atoms would you classify as, primary, and
tertiary?
(2 marks)
(iii)
Name the type of hybridization for carbon f and d.
(2 marks)
(b)
Give two simple visual chemical tests you would perform to differentiate
between
cyclobutane
(2) and cyclobutene (3). Explain what happens in each
case.
(4 marks)
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