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Unformatted text preview: Chemistry 2740 Spring 2011 Test 3 Time: 50 minutes Marks: 32 Aids allowed: calculator, 8 . 5 11-inch formula sheet Useful data is given on the reverse of this page. Instructions: 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. State whether each of the following statements is true or false, and explain briefly how you reached your conclusion. [2 marks each] (a) It is possible to measure the activity coefficient of a single ion in solution. (b) If, for a certain reaction, E > 0, then that reaction is thermodynamically allowed. (c) The reaction Fe(CO) 5 + OH- (CO) 4 FeH- + CO 2 is probably not elementary. 2. As you know, we often see the pH defined as- log 10 [H + ] rather than the more correct definition based on the activity of the hydrogen ion. How large a difference does thisdefinition based on the activity of the hydrogen ion....
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- Fall '07