Sch2102:Atomic Structure Question Paper
Sch2102:Atomic Structure
Course:Bachelor Of Science
Institution: Meru University Of Science And Technology question papers
Exam Year:2011
QUESTION ONE (30 MARKS)
a) i) Name the postulates of the kinetic molecular theory. (5 Marks) ii) 1) Based on the postulates of the kinetic molecular theory, give the conditions, pressure and temperature that you would cause a real gas to best simulate and an ideal gas. (2 Marks) 2) Explain your answer. (3 Marks) iii) xplain hy ogadro’s la that or ideal gas regardless o identity the olue of gas is already proportional to number of moles of gas. (5 Marks) b) State the diavitions of ideal gas equation and show the behaviour with an equation. (5 Marks) c) To apply a green chemistry approach a chemical engineer uses waste CO2 from a manufacturing process instead of chlorofluorocarbons as a blowing agent in the production of polystyrene. i. Calculate the density of CO2. (2 Marks) ii. Find the number of molecules per litter at (stp). (4 Marks) iii. Find the number of molecules at 25°. (4 Marks)
QUESTION TWO (20 MARKS)
a) Given the equation for a decomposition reaction 5 () 3 () + 2 ()
And Kp at 250° is 1.78.
Calculate the percentage of PCl5 that dissociates if 0.05 mole of PCl5 is placed in a closed (constant volume) at 250° and 2.00 Atm pressure. (7 Marks)
2
b) A 0.15 M solution of ammonia has a pH of 11.20. What is the Kb of Ammonia? (8 Marks) c) What is the pH of 0.3M acetic acid HC2H3O2 solution (Ka = 1.8 x 10-5)? (5 Marks)
QUESTION THREE (20 MARKS)
a) Define the following terms; i. Heat formation ii. Enthalphy change iii. Endothermic reaction (6 Marks) b) A 5.0g of NaNO3 is dissolved in 50g of water. The initial temperature of water was 21° and the final temperature of the water was 15.7°. i. Find the heat of solution per mode of NaNO3. (7 Marks) c) Camphor (C10H16O) has an energy of combustion of 5903.6 Kj/mol. When a sample of camphor with mass 0.1204g is burned in a bomb calorimeter, the temperature increases by 2.28°. Calculate the heat capacity of the calorimeter. (7 Marks)
QUESTION FOUR (20 MARKS)
a) State three factors that affect electrolyte conduction. (3 Marks) b) i) Calculate the E.M.F of a cell 3+0.12+0.01 Given 3+/ = 0.75,2+/ = 0.45 (8 Marks)
ii) Predict if the reaction is spontaneous. (2 Marks) c) Given the standard equation Fe3+(aq) + e- Fe2+(aq) MnO4-(aq) + 8H+(aq) + 5e- Mn2+(aq) + 4H2O(l)
(i) Write a cell diagram. (4 Marks) (ii) Explain the reactions taking place at anode and cathode. (3 Marks)
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