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sampleexam1 - CHEM 6B Winter 2007 Dr DiPasquale Exam 1 DO...

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Exam keys and scores will be posted at http://chem-tech.ucsd.edu/Recharges/SMXF/chem 6B_wi07 / CHEM 6B Winter 200 7 Dr. DiPasquale Exam 1 DO NOT OPEN THIS EXAM UNTIL YOU ARE TOLD TO DO SO!!! Please fill out your Scantron form using a No. 2 pencil as shown in the example to the left. Press hard when filling in bubbles and erase any stray marks. Write all 9 digits of your UC ID, beginning with “A”, in the boxes and fill in the corresponding bubbles. In the first column, fill in the “1” bubble for “A”. REMINDER: No Graphing Calculators, PDA’s, or Cell Phones permitted. Please ask if you have any questions. Fill in your test form. This is form A . Leave the exam number BLANK. There are 25 multiple choice questions worth four points each. Please record your answers on the Scantron as well as in this exam booklet, which you may use for your work. A Periodic Table is provided on the last page of this booklet, which you may rip out. The Scantron will not be returned. You have 50 minutes to complete as many questions as possible. When time is called, bring up your Scantron and exam booklet immediately . Late exams will not be accepted!!! Exam keys and scores will be posted on the course website after the exam. Good Luck!!!
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1. Calculate the final temperature when 2.50 kJ of energy is transferred as heat to 1.50 mol N 2 at 298 K and 1 atm at constant pressure. A) 159 ° C B) 82 ° C C) 75 ° C D) 92 ° C E) 80 ° C 2. Calculate the Br-Br bond enthalpy given the standard enthalpies of formation for Br 2 (g) and Br(g), 30.7 and 112 kJ mol 1 , respectively. A) 81 kJ mol 1 B) 143 kJ mol 1 C) 30.7 kJ mol 1 D) 255 kJ mol 1 E) 193 kJ mol 1 3. A piece of a newly synthesized material of mass 12.0 g at 88.0 ° C is placed in a calorimeter containing 100.0 g of water at 20.0 ° C. If the final temperature of the system is 24.0
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