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Pchem 011: Introduction To Basic Inorganic And Physical Chemistry Question Paper

Pchem 011: Introduction To Basic Inorganic And Physical Chemistry

Course:Certificate Of Pre-University Chemistry

Institution: Kabarak University question papers

Exam Year:2009

INSTRUCTIONS:
Attempt all questions
QUESTION ONE (24marks)
a. Define the following terms
i. Atomic number
ii. Isotopes
iii. Mass number (6marks)
b. Distinguish between a chemical and physical change and give an example in
each case. (4marks)
c. Explain Dalton’s theory on the laws of chemical reactions. (6marks)
d. Illustrate the discovery of electrons as described by J.J. Thomson (8marks)
QUESTION TWO (23marks)
a. Given the following mass-spectrometric data, calculate, the atomic mass of silver.
Isotope Mass(amu) % abundance
107Ag 106.906 51.84
109Ag 108.905 48.16
(6marks)
b. Adipic acid is used in the manufacture of nylon. The composition of this acid is 49.3%
C, 6.9%H, and 43.8% O by mass. What is its molecular formula given that it has a
molecular weight of 146 amu? (6marks)
c. A flask contains a solution with unknown amount of HCl. This solution is titrated with
0.101M NaOH. It takes 3.35ml NaOH to complete the reaction with this HCl. What is
the mass of the HCl acid? (5marks)
d. Methanol can easily burn in air. If 112g of methanol is used up in a combustion process,
how many moles of H2O are produced? (6marks)
QUESTION THREE (23marks)
a. Define the following terms
i. Ionic radii
ii. Electronegativity
iii. Electron Affinity (6marks)
iv. An atomic orbital is specified by four quantum numbers representing specific
properties of an electron in an orbital. State and explain these quantum numbers.
(4marks)
b. Explain the variation of atomic radii of elements within a period in the periodic table.
(3marks)
c. Using the orbital notation write the electronic configuration of the following elements;
B, Mg, Ne and P. (4marks)
d. Explain the existence of the following bonds, giving an example in each case.
i. Hydrogen bond
ii. Dipole-dipole bonds (4marks)
e. Illustrate the shapes of the following atomic orbitals: S, Px, Py and Pz.
(2marks)

Pchem 011: Introduction To Basic Inorganic And Physical Chemistry Question Paper

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