General Chemistry (CHMS2101)
BSc, Biochemistry - BCHS
Semester: First Semester
Level: 200
Year: 2017
THE UNIVERSITY OF BAMENDA FACULTY OF SCIENCE
DEPARTMENT OF CHEMISTRY
CA CHMS2101: GENERAL CHEMISTRY JAN 2018 1 H 30
WRITE ALL THE ANSWERS ON THIS PAPER
NAME: __________________ MATR NUMBER _________ PROGRAMME__________
R=8.314 J mol
-1
K
1
=0.08206 L atm mol
-1
K
-1
=1.987 cal mol
-1
K
-1
; atm=760mmHg
1. Name the types of radiation known to be emitted by radioactive elements.
2a. State two differences between a metal and a nonmetal.
b. An element on the periodic table has atomic number 34. Write out the electronic configuration.
c. Use this information to give the group and the period of the element. Explain.
d. Does this element have an acidic or basic oxide? Explain.
3. Write the names and symbols for four elements in each of the following categories.
(a) non-metal,
(b) metal,
(c) metalloid
4. A sample of nitrogen gas kept in a container of volume 2.3L and at a temperature of 32
o
C exerts a
pressure of 4.7 atm. Calculate the mass of gas present
5a. What is the difference between a gas and a vapour?
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b) At 25
o
C, which of the following substances in the gas phase should be properly called a gas and which
should be called a vapour?
Molecular nitrogen, mercury?
7. Name five elements and five compounds that exist as gases at room temperature,
8a. The volume of a gas is 5.80 L, measured at 1.00atm. What is the pressure of the gas in mmHg if the
volume is increased to 9.65 L at constant temperature?
b. What is the name of the transformation above?
9. State Graham’s law of diffusion.
10. What is the difference between a non-electrolyte and an electrolyte?
The difference between a weak electrolyte and a strong electrolyte?
11. What do you understand by a limiting agent?
Methanol is industrially synthesized by reacting carbon monoxide with hydrogen at high temperature. Write
down the balanced equation of the reaction. An initial mixture contained 112g of carbon monoxide (M=28)
and 12g of hydrogen (M=2). Which of the reactants is the limiting reagent? The excess reagent? Explain.
If 12g of methanol were obtained from the reaction, what is the percentage yield of the synthesis?
What is the mass of excess reagent left during the synthesis?
12. Lithium has only two isotopes. Define isotopy
What is the difference between an isotope and an allotrope? Give example of each.
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The atomic masses of Li
3
6
and Li
3
7
are 06.0151 au and 7.0160 au, respectively. Calculate the natural
abundance of these two isotopes whose average atomic mass is 6.941 au.
13. What is the meaning of empirical formula? If the empirical formula of a compound is known, what
additional information is needed to determine its molecular formula?
14. Name four methods of separation of mixtures and describe one of them.
14. Situate the elements
10
X and
28
Y in the periodic table.
15. Name and describe the different types of chemical bonding.
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