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Chemistry102Winter2006FirstExam_v2

Chemistry102Winter2006FirstExam_v2 - Last Name First Name...

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Last Name_______________________ First Name_________________ p1 of 10 Student ID # Signature Lab TA’s name Lab Section MIDTERM EXAM Chemistry 102, Winter 2006 Please read the entire page of directions before you begin. Do not begin until you are instructed to do so by your TA. You will have 2 hours to complete this exam. YOU MUST FILL OUT THE BUBBLE PAGE NAME (last, first) and ID Number WITH BUBBLES YOU MUST FILL OUT THE FOLLOWING VERSION NUMBER CODE ON THE BUBBLE FORM BY FILLING IN THE APPROPRIATE BUBBLES THIS TEST IS VERSION 02 VERSION NUMBER ENTERED UNDER DAY BIRTHDATE DAY 02 At the completion of this exam, you will hand in this exam and the bubble sheet into separate piles, with bubbles page face down. Every student MUST turn in both a test and their bubble sheet. The periodic table is at the back of the examination. You may separate that page carefully once you have begun working. Choose the best answer for each question. R = 8.31451 J / mol · K = 0.08206 L· atm / mol · K When creating molecular orbital energy-level diagrams, use the N 2 orbital order for molecules whose neutral state has 10 or fewer electrons. Use the O 2 orbital order when the neutral state has more than 10 electrons.
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Last Name_______________________ First Name_________________ p2 of 10 1. Knowing that ΔH vap for water is 40.7 kJ/mol, calculate P vap of water at 37˚C. a. 25.4 torr b. 6.90 torr c. 12.4 torr d. 18.7 torr e. 52.6 torr 2. Select the molecule among the following that has no dipole moment. a. NH 3 b. CO 2 c. H 2 O d. all e. none 3. A solute added to a solvent raises the boiling point of the solution because a. the solute particles lower the solvent’s vapor pressure, thus requiring a higher temperature to cause boiling. b. the solute increases the volume of the solution, and an increase in volume requires an increase in the temperature to reach the boiling point (derived from PV = nRT ). c. the solute particles raise the solvent’s vapor pressure, thus requiring a higher temperature to cause boiling. d.
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