Exam-1-B - Fall 2010 CHEMISTRY 104 Section 001 Exam 1 Name:...

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Fall 2010 CHEMISTRY 104 Section 001 Exam 1 Name: ____________________ ID: XXX-XX-_ ______ Seat #: ___ 1. The triple point of CO 2 is at 5.2 atm and –57°C. Under atmospheric conditions present in a typical Boulder, Colorado, laboratory ( P = 630 torr, T = 23°C), solid CO 2 will: A) remain solid. B) boil. C) melt. D) sublime. E) none of these 2. Which substance involves no bonding forces except London dispersion forces? A) K(s) B) NaCl(l) C) HF(l) D) H 2 O(l) E) N 2 (s) Use the following to answer question 3. Solutions of benzene and toluene obey Raoult’s law. The vapor pressures at 20 ° C are: benzene, 76 torr; toluene, 21 torr. 3. What is the mole fraction of benzene in a solution whose vapor pressure is 50 torr at 20°C? A) 0.28 B) 0.76 C) 0.72 D) 0.47 E) 0.53 Page 1
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Use the following to answer question 4. The questions below refer to the following diagram: 4. If the reaction were reversible, would the forward or the reverse reaction have a higher activation energy? A) The forward and reverse activation energies are equal. B) The forward activation energy C) The diagram shows no indication of any activation energy. D) The reverse activation energy E) none of these 5. On a relative basis, the weaker the intermolecular forces in a substance, A) the higher its melting point. B) the greater its heat of vaporization. C) the greater its vapor pressure at a particular temperature. D) the more it deviates from ideal gas behavior. E) none of these 6. The catalyzed pathway in a reaction mechanism has a __________ activation energy and thus causes a __________ reaction rate. A) higher, steady B) higher, higher C) lower, higher D) higher, lower E) lower, steady Page 2
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7. Two liquids form a solution and release a quantity of heat. How does the pressure above the solution compare to that predicted by Raoult's law? A) It will show positive deviation. B) It will be less. C) It will be greater. D) It will be the same. E) none of these. 8. Calculate the osmotic pressure (in torr) of 6.00 L of an aqueous 0.245 M solution at 30.
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This note was uploaded on 02/25/2011 for the course CHEM 222 taught by Professor Harding during the Fall '08 term at CUNY Hunter.

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Exam-1-B - Fall 2010 CHEMISTRY 104 Section 001 Exam 1 Name:...

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