F03_E3A - Chemistry 111 Page 1 out of 7 Exam III/Fall 2003...

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Chemistry 111 Page 1 out of 7 Exam III /Fall 2003 Answer Key Instructions . Failure to show work will result in zero points being awarded in any question, unless it actually requires no work. If a blank is provided for an answer, you must enter your answer in that blank. 1. If the reaction: A Products… follows second order kinetics, then a plot of [A] versus time would be linear. True or false ? Circle your answer. (02 pts) 2. Going back to the first question, a plot of ln[A] versus time would be linear. True or false ? Circle your answer. (03 pts) 3. If the time is measured in minutes, what would be the units of k in the first question? Write your answer in the blank. (03 pts) L mol -1 min -1 or atm -1 min -1 4. Which of the following would have the largest value for b in the Vander Waals equation of state? (03 pts) CH 3 CH 2 CH 3 CH 3 C(CH 3 ) 2 CH 3 CH 3 CH 3 CH 4 For questions 5-8 , consider three identical tanks kept under the exact conditions of temperature and pressure. One contains SO 2 (MW = 64), another contains O 2 (MW = 32) and the last one has CH 4 (MW = 16). 5. Which of these gases would have the highest average kinetic energy? (03 pts) They are all at the same temperature, therefore they all have the same average kinetic energy. Remember that the average kinetic energy is given by… KE = 3 2 R T 6. Which of these gases would have the fastest root mean square velocity? (03 pts) Now that is a different question. They have the same energy, but since they have different molecular weights, they have different average velocities. From the equation… v rms = 3 R T MW
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Chemistry 111 Page 2 out of 7 Exam III /Fall 2003 Answer Key we learned that the lighter the gas, the faster it travels on the average. Therefore, the answer is CH 4 gas. 7. The density of the gases in the tanks gets halved as we compare SO 2 to O 2 and once more when we compare O 2 to CH 4 . True or false? Circle. (03 pts) Remember that density is given by the following equation… Density = P × MW R T Therefore, the higher the molecular weight, the higher the density (because they are kept under identical conditions of temperature and pressure). Since the molecular weight of oxygen is half of that of sulfur dioxide and since the molecular weight of methane is half of that of oxygen gas, then it must be true. 8.
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This note was uploaded on 02/08/2010 for the course CHEM 111 taught by Professor Kenney during the Spring '08 term at Case Western.

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F03_E3A - Chemistry 111 Page 1 out of 7 Exam III/Fall 2003...

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