Chemistry 411-Exam 1-Summer 2010

Chemistry 411-Exam 1-Summer 2010 - Principles of Chemistry...

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1 Principles of Chemistry I Summer 2010 Exam 1 Name: ___________________________________ R = 0.0821 L.atm/mol.K R = 8.314 J/mol.K N A = 6.022 x 10 23 mol -1 o o t o t o o t A k t kt A A k t kt A A k A t kt A A ] [ 1 ] [ 1 ] [ 1 2 ln ] [ ] [ ln 2 ] [ ] [ ] [ 2 / 1 2 / 1 2 / 1 = = - = - = = - = - 1 2 2 1 1 1 a E k ln k R T T = - - S g = k P g P = i X solute solvent T b = i K b m T f = i K f m π = i MRT For water: K b = 0.51°C/m K f = 1.86°C/m a E RT k Ae - =
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2 Multiple Choice Section (3 points each): 1) What type of attractive forces are being overcome when liquid oxygen boils at 90 K? A) ionic bonds B) dipole-dipole forces C) covalent bonds D) dispersion forces E) hydrogen bonds 2) Which of the following elements has the highest boiling point? A) He B) F 2 C) Ne D) Br 2 E) Ar The next TWO questions refer to 4 liquids, all of which have the molecular formula C 4 H 10 O and which have the following boiling points: I (117.5 o C); II (82.9 o C); III (34.6 o C); IV (99.5 o C). 3) The liquid likely to have the highest vapor pressure at 25 o C is: A) I B) II C) III D) IV E) All four substances would have the same vapor pressure since they have the same molecular weight. 4) Given the structural isomers below, the one most likely to be liquid C is:
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3 5) All A solution of sucrose (sugar) in water is in equilibrium with solid sucrose. If more solid sucrose is now added, with stirring,
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This note was uploaded on 12/07/2011 for the course CHEM 004 taught by Professor Maalouf during the Spring '11 term at University of Iowa.

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Chemistry 411-Exam 1-Summer 2010 - Principles of Chemistry...

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