F03_E4 - ID Number: _ _ - _ _ _ _ (LAST six digits only!)...

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ID Number: _____ _____ - _____ _____ _____ _____ (LAST six digits only!) Chemistry 111 November 13, 2003 Page 1. (21 pts) Page 2. (18 pts) Page 3. (12 pts) Page 4. (12 pts) Page 5. (18 pts) Page 6. (15 pts) Page 7. (06 pts) Total: (100 pts)
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Chemistry 111 Page 1 out of 8 Exam IV /Fall 2003 ID Number: _____ _____ - _____ _____ _____ _____ (LAST six digits only!) 1. Look at the following mechanism and answer the questions below. A 2 B + X A 2 BX k 1 k 2 k 3 A 2 BX 2 A + B + X a) What would you call the substance X? ___________________ (02 pts) b) What would you call the substance A 2 BX? ______________________ (02 pts) c) What is the overall reaction? ___________________________ (02 pts) 2. Consider the following reaction, which takes place at 25°C. 2 NO 2 + F 2 2 NO 2 F Experimentally, it is observed that the rate equation is second order, first order with respect to each reagent: rate = k [NO 2 ] [F 2 ]. Propose a two step mechanism for this reaction. Indicate which is the slow step of the mechanism. (05 pts) 3. In the previous exam, Spiderman was in trouble and some of you suggested slowing down the reaction by lowering the temperature of the room. Assuming that the activation energy of the reaction was 21.0 kJ/mol and that the initial temperature of the room was 27°C, what would have had to be final temperature in order to double the time he had to get out of the room? (10 pts)
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Chemistry 111 Page 2 out of 8 Exam IV /Fall 2003 ID Number: _____ _____ - _____ _____ _____ _____ (LAST six digits only!) 4. A certain student measured experimentally the heat capacity (Cp) for a certain gas and
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F03_E4 - ID Number: _ _ - _ _ _ _ (LAST six digits only!)...

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