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Chemistry (Chem 051) Question Paper

Chemistry (Chem 051)

Course:Education

Institution: Kenya Methodist University question papers

Exam Year:2013

TIME : 2 HOURS

Instructions:
Answer any THREE Questions.
Each Question has 20 Marks
Students are allowed to use the periodic table where necessary.
Question One
Using the following headings explain the development of the periodic table.
Noberener & Wewlands
(3 Marks)
Modern Periodic table
(2 Marks)

State the octet rule.
(2 Marks)
Differentiate between a molecular compound and an ionic compound.

(3 Marks)
Using the periodic table predict the molecular formulae of:-
Lithium and oxygen.
(1 Mark)
Nickel and sulfur
(1 Mark)
Magnesium and chlorine
(1 Mark)
Gallium and fluorine
(2 Marks)

Question Two
A compound with a molecular mass of 34.0g/mol is known to contain 5.88% hydrogen and 94.12% oxygen.
Find its empirical formular.
(3 Marks)
Calculate its molecular mass.
(3 Marks)
Calculate its molecular formular.
(4 Marks)
Explain the following terms:
Molarity
(2 Marks)
Molality
(2 Marks)
(i) Calculate the molarity of a sulphuric acid solution containing 24.2g of sulphuric acid m 198g of water (molar weight of sulphuric acid is 98.08).
(4 Marks)
State the following laws:
Boyles Law
(2 Marks)
Charles Law
(2 Marks)
Ideal Gas Law
(2 Marks)

Question Three
A quantity of gas at 10oC and at 1 atm pressure occupied a volume of 200cm3. What volume will it occupy at -20oC at constant pressure.

(5 Marks)
How many grams of oxygen are there in a 50L tank at 21oC when oxygen pressure is 50.0 atm.
(5 Marks)
R = 0.082Latm/kg.mol.
If Nitrogen gas heated to 800k in a vessel of constant volume eaters at a pressure of 100 atm and a temperature of 300k, what pressure would it exert at the working if it behaved as a perfect gas.
(5 Marks)
State any FIVE applications of radio isotopes.
(5 Marks)

Question Four
Name the THREE subasomic particles and give their relative charges.

(3 Marks)
What are nucleous?
(2 Marks)
Differentiate between atomic mass and atomic number and give an example for each.
(5 Marks)
What are isotopes.
(2 Marks)
Give the electronic arrangement of argon.
(3 Marks)

Question Five
What is chemical stotiometry?
(3 Marks)
Explain:
Mole concept
(2 Marks)
Arogadro’s number
(2 Marks)

Explain what empirical formular is.
(3 Marks)

If carbon and hydrogen are present in a compound in the ratio 1:2 what is its empirical formuar.
(2 Marks)
If the molecular mass of the compound in C(i) is 28glmol what is the molecular formular of the compound.
(8 Marks)

Chemistry (Chem 051) Question Paper

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