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Inorganic Chemistry I - Chem 111 Question Paper
Inorganic Chemistry I - Chem 111
Course:Bachelor Of Education Science
Institution: Kabarak University question papers
Exam Year:2009
INSTRUCTIONS:
Attempt All Questions
QUESTION ONE (17.5 Marks)
a) Define the following terms
i. Atomic number
ii. Isotopes
iii. Mass number (3 marks)
b) Distinguish between a chemical change and a physical change. Give an example in
each case. (4 marks)
c) Explain Dalton’s theory on the laws of chemical reactions. (3 marks)
d) Illustrate the discovery of electrons as described by J.J. Thomson (4 marks)
e) State and explain the significance of the four quantum numbers, and hence give all the
possible quantum numbers that define an electron in the third energy level. (3.5 marks)
QUESTION TWO (17.5 Marks)
a) Calculate the atomic mass of silver using the following mass-spectrometric data:
(4 marks)
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? (3.5 marks)
c) A flask contains a solution with unknown amount of HCl. This solution is titrated with
0.101M NaOH. It requires 3.35ml NaOH to complete the reaction with this HCl. What
is the mass of the HCl acid? (4 marks)
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? (3 marks)
Isotope Mass(amu) % abundance
107Ag 106.906 51.84
109Ag 108.905 48.16 Page 3 of 4
e) Balance the following equations
a. Al + Fe3O4 Al2O3 + Fe
b.
238
92U X
YTh + 4
2He2+ (3 marks)
QUESTION THREE (17.5Marks)
a) Define the following terms:
i. Ionic radii
ii. Electronegativity
iii. Electron Affinity (3 marks)
a) Explain the variation of atomic radii of elements within a period in the periodic table.
(3 marks)
b) The second ionization energy of Al is higher than the first. Explain this observation.
(2.5 marks)
c) Using the orbital notation write the electronic configuration of the following elements;
B, Mg, Ne and P. (4 marks)
d) Hydrogen atoms absorb energy so that the electrons are excited to the energy level n=7.
These electrons then undergo the following transitions; n=7 to 1, n=7 to 6 and n=7 to 5.
Which of these transitions has
i. the highest energy?
ii. the highest wavelength? (5 marks)
QUESTIONN FOUR (17.5Marks)
a) Differentiate between intramolecular and intermolecular bonds. (2 marks)
b) Explain the existence of the following bonds giving an example in each case.
i. Hydrogen bond
ii. Dipole-dipole bonds. (4 marks)
c) In reference to magnetic properties in elements, explain the existence of;
i. Diamagnetic materials
ii. Paramagnetic materials
iii. Ferromagnetic materials. (6 marks)
d) Illustrate the shapes of the following atomic orbitals: S, Px, Py and Pz. (4 marks)
e) Show the resonance structures of O3. (1.5 marks)
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