Midterm_v0108

# Midterm_v0108 - 1 Student ID # Signature Lab TA's name Lab...

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1 Student ID # Signature Lab TA’s name Lab Section MIDTERM EXAM Chemistry 102, Winter 2008 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 01 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 exam. You may separate that page carefully once you have begun working. Choose the best answer for each question . R: 8.3145 Jmol 1 K 1 , 0.08206 L atm mol 1 K 1 N a : 6.022 x10 23 molecules/mol 1 atm = 760 Torr (=760 mm Hg) 2 1 1 2 1 1 ln o vap H P P R T T ! " # ! " = \$ % % % ( ( ! S mix = " R ( n A ln x A + n B ln x B ) n ! = 2 d sin " # = iM J RT \$ T f = % iK f m J \$ T b = iK b m J P S = X S P S o P i = X i P i o

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2 1.) Given that the bond energy of a C=C is 611 kJ/ mol and the bond energy of a C-C is 347 kJ/ mol. What is the best estimate of the bond energy for a C C? a) 1200 kJ/ mol b) 800 kJ/ mol c) 600 kJ/ mol d) 650 kJ/ mol e) 1000 kJ/ mol 2.) What is the formal charge on the center iodine in [I 3 ] ? a) -2 b) -1 c) 0 d) +1 e) +2 3.) Given the following two surfaces for a graduated cylinders, what would water’s meniscus look like? (Concave down is the meniscus for Hg in glass.) Bulk Al O Al O Al O OH OH OH O Al O Al O Al O Surface Bulk Al O Al O Al O CH 3 CH 3 CH 3 O Al O Al O Al O O Surface I II a) Water’s meniscus is always concave down b) Water’s meniscus is always concave up c) Water’s meniscus is concave down in cylinder I and concave up in cylinder II d) Water’s meniscus is concave up in cylinder I and concave down in cylinder II e) Water’s meniscus is flat
3 4.) What is the order of expected freezing points (greatest to least) for the following aqueous solutions? Molecule

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## This note was uploaded on 09/08/2010 for the course CHEM 102 taught by Professor Spears during the Spring '08 term at Northwestern.

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Midterm_v0108 - 1 Student ID # Signature Lab TA's name Lab...

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