winter2005_practice_final

winter2005_practice_final - 1 Last Name _ First Name_ FINAL...

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Last Name _________________________________ First Name__________________ FINAL EXAM Chemistry 102, Winter 2004 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 01 VERSION NUMBER ENTERED UNDER DAY BIRTHDATE DAY ## DO BUBBLES! YOU MUST ENTER ZERO BEFORE THE NUMBER 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 equation page and periodic chart are at the back of the examination. You may separate these pages carefully once you have begun working. 1
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Chemistry 102 Final Exam, Winter 2004 30 Questions, ~6.67 points per question. version 01 Choose the response that best answers each question. Put ANSWERS on BUBBLE FORM 1. When 0.800g of NH 4 NO 3 was added to 150.0g of water in a Styrofoam cup, the temperature dropped by 0.413 o C. The heat capacity of H 2 O is 4.18 J/g o C. Assume the specific heat of the solution equals that of pure water and that the calorimeter neither absorbs nor leaks heat. The molecular weight of NH 4 NO 3 is 80 g/mol and H 2 O is 18 g/mol. The molar heat of solution of solid NH 4 NO 3 is: a) +260.0 J/mol b) +26.0 kJ/mol c) +2.60 kJ/mol d) –2.60 kJ/mol e) none of these ANS: B 2. Silver chloride crystallizes with the sodium chloride (rock salt) structure. The radius of Cl - is 181 pm, the radius of Ag + is 96.5pm. What is the density of AgCl? The atomic weight of Ag is 107.9g/mol and Cl is 35.5 g/mol. a) 5.57 g/cm 3 b) 44.6 g/cm 3 c) 2.79 g/cm 3 d) 22.3 g/cm 3 e) 11.1 g/cm 3 ANS: A 3. At a given temperature, you have a mixture of benzene (vapor pressure of pure benzene = 745 torr) and toluene (vapor pressure of pure toluene = 290 torr). The mole fraction of benzene in the vapor above the solution is 0.590. Assuming ideal behavior, calculate the mole fraction of toluene in the solution. a) 0.213 b) 0.778 c) 0.641 d) 0.450 e) 0.590 ANS: C 2
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4. Two isomers exist, one is (1) H 3 CNC and the other is (2) H 3 CCN where the H 3 C is a simple methyl group bonded to either N or to C. The correct formal charges for the N atom in molecules (1) and (2) respectively are: Order: (1), (2) f) +1, +1 g) +1, 0 h) 0, +1 i) –1, 0 j) 0, 0 ANS: B 5. The TeF 5 - molecule is the subject of the following statements. Select the answer that identifies all the TRUE statements. I.
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This note was uploaded on 02/20/2012 for the course CHEM 102 taught by Professor Spears during the Fall '08 term at Northwestern.

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winter2005_practice_final - 1 Last Name _ First Name_ FINAL...

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