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Chem 113: Physical Chemistry Question Paper

Chem 113: Physical Chemistry 

Course:Diploma In Pharmaceutical Technology

Institution: Kenya Methodist University question papers

Exam Year:2015



SCHOOL : SCIENCE AND TECHNOLOGY
DEPARTMENT : PURE AND APPLIED SCIENCES
UNIT CODE : CHEM 113
UNIT TITLE : PHYSICAL CHEMISTRY
TIME : 2 HOURS


INSTRUCTIONS
Answer All Questions in Section A and any other Two questions from Section B.

Section A

Question One

(i) Explain the meaning of colligative property? (2 marks)
List the four properties defined in (ai) above (6 marks)
(iii) Give the importance of each property named in a(i) above (6 marks)

b. i) State the following laws
Avagadro (1 marks)
Raoult (1 Marks)
(ii) Graphically explain Maxwell and Boltzman law (4 marks)

(i) Account for increase in mean path of molecules in a gas and the decrease of collision per unit time with lowering pressure (3 marks)
(ii) Calculate the root mean square velocity of the molecules of CO2 at 298K. (R=8.314JK-1mol) (3 marks)
(iii) State the mean of the terms in PAV=nART (4 Marks)

Section B

Question Two

(i) State kinetic molecular theory (2 Marks)
(ii) Give 5 postulates of this theory (5 Marks)
Using relevant laws and their relationships determine the molecular weight of a gas which takes 46 times longer to effuse a particular than hydrogen at the same conditions (5 marks)
A 100 L sample of dry air at 786 Torr and 25? contains 0.925gN2 plus other gases. Calculate
The partial pressure (4 marks)
Mole fraction of N2 (4 Marks)

Question Three

a). i. Explain the reason for the observed differences solubility of different compounds in water (5 marks)
Using NaCl and CaSO4, draw the part that bring the differences stated in (ai) above (5 Marks)

b). Account for the following observations using graphs
Carbonated soft drinks have more bubbles if refrigerated (5 marks)
Level of oxygen in lakes near Sahara is lower than lakes near Mt. Kenya (5 marks)

Question Four

Derive the rate law (4 marks)

Calculate the rate constant given the reaction (4 marks)

Trials (
[I-] Initial Rates
1 0.08 0.034 2.2x10-4
2 0.08 0.017 1.1x10-4
3 0.16 0.017 2.2x10-4

Given the reaction
N2O5 NO2+NO3
Calculate the half- life for the reaction (5 Marks)

Explain with the help of a phase diagram how temperature and pressure can independently affects the phase of a substance such as carbon dioxide . (8 marks)




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