General_Chemistry_I_Final_Exam_Sem_1_2009 - UNIVERSITY OF...

UNIVERSITY OF TECHNOLOGY, JAMAICA
FACULTY: SCIENCE AND SPORT
SCHOOL: NATURAL AND APPLIED SCIENCES
Final Examination, Semester I
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Module Name: General Chemistry I
Module Code: CHY2021
Date: December 2009
Theory/Practical: Theory
Groups: AS-1/MT-1/DN-1/EH-1/SE-2/BENG-1/BUILT-1
Duration: 2 HOURS
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Instructions: This paper consists of a cover page and 3 printed pages with six (6)
questions.
ANSWER ANY FOUR (4) QUESTIONS
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Constants : 1atm = 760 mmHg = 760 torr = 101.3 kPa
Avogadro’s number ( N
A
) = 6.022  10 23
Universal gas constant, R = 8.314 J mol -1 K -1 = 0.08206 L.atm K -1 mol -1
Planck’s constant ( h ) = 6.626  10 -34 Js
Speed of light ( c ) = 3.00  10
8
m s
-1
Rydberg constant, R
H
= 2.18  10 -18 J
1 Faraday = 96,500 C/mol e -
1 mol any gas at stp = 22.4 dm 3 , at room temperature = 24 dm 3
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DO NOT TURN THIS PAGE UNTIL YOU ARE TOLD TO DO SO
0

QUESTION 1
a. Use the kinetic particle theory to account for the different states of matter. [4]
b. Differentiate between the following:
(i) chemical and physical properties
(ii) homogeneous and heterogeneous mixtures [2 + 2]
c. Discuss Rutherford’s Gold Foil Experiment and the conclusions made from this
experiment in the early elucidation of the atomic structure.
{NB: the use of suitable and clearly labelled diagrams are expected } [6]
d. Calculate the principal quantum number energy level ( n
f
) reached when an electron is
excited from the n = 2 quantum level by absorbing 4.088  10
-19
J in a hydrogen atom.
[3]
e. Draw representatives of the three, 2 p orbitals. How do they differ? [3]
[Total = 20 marks]