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Sch 103: Physical Chemistry 1 Question Paper

Sch 103: Physical Chemistry 1

Course:Physical Chemistry

Institution: University Of Nairobi question papers

Exam Year:2013

UNIVERSITY OF NAIROBI
FIRST SEMESTER EXAMINATIONS 2013/2014
FIRST YEAR EXAMINATIONS FOR THE DEGREE OF BACHELOR OF SCIENCE, INDUSTRIAL CHEMISTRY / BSC BIOLOGY/ BSC GEOLOGY
SCH 103: PHYSICAL CHEMISTRY 1
Date: 26/ 08/ 2013
Time: 9:00am- 11:00 A.M
ANSWER ALL QUESTIONS
1. A) State graham’s law of diffusion and give the relationship between the times (t1 and t2) of diffusion of two gases of masses M1 and M2 respectively to diffuse through a hole at a given temperature. 4 marks
B) if it takes 4.6 times as long for a gas y to effuse as it takes hydrogen gas (molar mass= 1) under the same conditions. Calculate:
i) what is the molecular mass of the gas Y? 4 marks
ii) separation factor for Y and hydrogen 2 marks
iii) Give applications of diffusion separation method in a chemical industry. 5 marks
2. A) define the term colligative properties and show their mathematical relationships. 10 marks
b) illustrate using a phase diagram of water the three colligative properties: freezing point depression, boiling point depression, boiling point elevation and vapor pressure lowering. 10 marks
c) a 7.85g sample of a compound with empirical formula C5H4 is dissolved in 301g of benzene. The freezing point of the solution is 1.05C below that of pure benzene. What are the:
i) molar mass
ii) molecular formula of this compound?
Kf benzene= 5.12C/m 10 marks

3. Write short notes on the following:
a. Industrial fraction distillation column
b. Choosing optimal conditions for the synthesis of ammonia
c. Dependence of % ionization on initial concentration of a weak acid and a strong acid
d. Preparation of an acetate buffer solution whose pH= 4.92; pKa for acetic acid is 4.74.

Sch 103: Physical Chemistry 1 Question Paper

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