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Unformatted text preview: Chemistry 2740 Spring 2010 Final Examination Time: 3 hours Marks: 105 Aids allowed: calculator, 8 . 5 11-inch formula sheet Useful data is given on the back page of this exam. Instructions: Answer all questions in section 1. In sections 2 and 3, answer only the required number of questions. Extra answers will not be marked. Cross out any work you dont want me to mark. You can answer the questions in any order, but make sure that you clearly label each of your answers with the question number in your exam booklet(s). If you use a graph to answer a question, make sure to provide a reasonable sketch of the graph, as well as a brief explanation of what information the graph provides. 1 Answer all questions in this section. Value of this section: 79 1. In the textbook, I avoided the commonly used word spontaneous in the section on thermodynamics, preferring the phrase thermodynamically allowed. Why? [2 marks] 2. Explain why the law of microscopic reversibility is required to make kinetics consistent with thermodynamics. [2 marks] 3. What is an initial rate experiment? Briefly discuss the advantages and disadvantages of initial rate experiments. [6 marks] 4. Explain the physical origin of the phenomenon of transmembrane potential. [8 marks] 5. The solubility of calcium carbonate in water is 1 . 53 10- 4 mol / L at 25 . C and 1 . 90 10- 4 mol / L at 75 . C. The relative permittivity of water at 25 . C is 78.37, and at 75 . C it is 62.36. (a) Calculate the mean ionic activity coefficient of calcium carbonate in each of these solutions. [8 marks] (b) Estimate the enthalpy of solution of this compound, taking into account the non- ideal behavior of calcium carbonate in water. [6 marks] (c) Estimate the standard enthalpy and standard free energy of formation of an aque- ous calcium ion, again taking nonideal effects into account. [8 marks] 1 6. Aplysia dactylomela is a species of sea hare (a type of sea slug) that reproduces very rapidly. A. dactylomela s diet consists of a variety of algae. In one set of lab exper- iments, A. dactylomela was fed a diet of Cladophora , a green algae., a green algae....
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- Fall '07