Physical Chemistry Ii Question Paper
Physical Chemistry Ii
Course:Bachelor Of Science In Analytical Chemistry
Institution: Jomo Kenyatta University Of Agriculture And Technology question papers
Exam Year:2013
CHEMISTRY DEPARTMENT.
BACHELOR OF SCIENCE DEGREE PROGRAMME.
SC 2201-PHYSICAL CHEMISTRY.
CAT 1 19TH FEB , 2013 TIME:1.5 HRS
Instructions: attempt all questions.
1. a) What is meant by the term system in thermodynamics? (2mrks) b)What is a closed system?(2mrks)
2. a)What is work? (2mrks) b)How do we determine the amount of work done given the force associated with the work?(2mrks)
3. a)State the first Law of thermodynamics?(2mrks)
b) What is meant by the internal energy system?(2mrks)
c) By what means can the internal energy of a closed system increase?(2mrks)
4. a)Why is the change in enthalpy usually easier to increase than the change in internal energy?(2mrks) b)For a given process at constant pressure, ?H is negative. Is the process endothermic or exothermic? (2mrks)
5. a)what is meant by the term state function?(2mrks)
b) Give an example of a quantity that is a state function and one that is not?(2mrks)
c) Is work a state function? Why or why not? (2mrk)
6. A gas is confined to cylinder under constant atmospheric pressure. When the gas undergoes a particular chemical reaction, it releases 79kJ of heat to its surroundings and does 18kJ of P-V work on its surroundings. What are the values of ?H and ?E for this process?
7.Two gases A and B are confined in a cylinder and a piston arrangement . Substances A and B react to form a solid product
A(g) +B(g) ?C(g)
As the reaction occurs, the system loses 1150J of heat to the surroundings. The piston moves downward as the gases react to form a solid. As the volume of gas decreases under constant pressure of the atmosphere, the atmosphere, the surroundings do 480J of work on the system. What is the change in the internal energy of the system? (5mrks)
8. a)How much heat is needed to warm 250g of water(about 1 cup) from 22oC (about room temperature )to near its boiling point 98oC.The specific heat of water is 4.18J/gK(5mrks)
b) What is the molar heat capacity of water?(3mrks)
9. The specific heat of silver is 0.0565 cal/goC. Assuming no loss of heat to the surroundings or to the container, calculated the final temperature when 100g of silver at 40.0oC is immersed in 60.0g of water at 10.0oC.
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