Exam2_2009

Exam2_2009 - Chemistry 131 Preliminary Exam II 27 October...

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Unformatted text preview: Chemistry 131 Preliminary Exam II 27 October 2009 8:00 a.m. to 9:30 a.m. Name: ________________________ ID #: ________________________ Workshop Meeting Time (day/hour/building) ________________________ (2 pts. Extra credit) This exam consists of six (6) questions, one extra credit problem, and a page of potentially useful information. Please check BEFORE you begin to make sure that you have a complete exam. Please do all your work on the pages provided. You may use the backside of pages for additional work, but please tell us that you are doing so (i.e. an arrow with a note in clear English saying "more work on back"). SHOW ALL WORK . GIVE UNITS for all answers that require them. Partial credit can only be given for those answers for which work is provided. CIRCLE YOUR ANSWER. We ask this so that we don't have to interpret what you intended as your final answer. Some molecular masses are provided in {}. GOOD LUCK! Prob. W.S. 1(30) 2(25) 3(25) 4(30) 5(30) 6(25) E.C.(5) Total Score ROCHESTER U N I V E R S I T Y O F University of Rochester Rochester, New York 14627-0216 COLLEGE OF ARTS AND SCIENCE DEPARTMENT OF CHEMISTRY 1) You have four identical 2.242 L flasks (contents and conditions listed below) at 273 K. Assume any gasses are ideal . You do not need to show any work. The molar mass of a given molecule or gas mixture is given in parenthesis {}. Flask A: 2.018 g Ne {20.18} Flask B: 0.1 atm CO 2 {44.0} Flask C: 1.313 g Xe {131.3} Flask D: 2 atm CO {28.0} a) (5 pts.) Circle the answer for which the flask's contents are at the highest kinetic energy? Flask A Flask B Flask C Flask D All are the same kinetic energy b) (5 pts.) Circle the answer for which the flask's contents have the smallest average (i.e. root mean square) velocity? Flask A Flask B Flask C Flask D All are the same velocity c) (5 pts.) Circle the answer for which flask has the highest total pressure? Flask A Flask B Flask C Flask D All are the same pressure d) (5 pts.) If these flasks were opened inside an evacuated chamber, circle the answer for which flask would lose its contents through effusion the fastest ? Flask A Flask B Flask C Flask D All effuse at the same rate e) (5 pts.) Circle the answer for which flask weighs the most ? Flask A Flask B Flask C Flask D All weight the same f) (5 pts) Circle the answer for which flask has the most atoms ?...
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Exam2_2009 - Chemistry 131 Preliminary Exam II 27 October...

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