Exam-1-D - 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. Generally the vapor pressure of a liquid is related to I. the amount of liquid II. atmospheric pressure III. temperature I V . intermolecular forces A) III, IV B) I, III C) all information is needed D) II, III, IV E) I, III, IV 2. Which of the following chemical or physical changes is an endothermic process? A) the freezing of water B) the combustion of gasoline C) the mixing of sulfuric acid and water D) the evaporation of water E) none of these 3. A cucumber is placed in a concentrated salt solution. What will most likely happen? A) No change will occur. B) Water will flow from the solution to the cucumber. C) Salt will precipitate out. D) Salt will flow into the cucumber. E) Water will flow from the cucumber to the solution. Page 1
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4. The catalyzed pathway in a reaction mechanism has a __________ activation energy and thus causes a __________ reaction rate. A) higher, steady B) higher, lower C) lower, higher D) lower, steady E) higher, higher Use the following to answer question 5. The questions below refer to the following diagram: 5. If the reaction were reversible, would the forward or the reverse reaction have a higher activation energy? A) The diagram shows no indication of any activation energy. B) The forward and reverse activation energies are equal. C) The reverse activation energy D) The forward activation energy E) none of these Page 2
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For the reaction 2N 2 O 5 (g) 4NO 2 (g) + O 2 (g), the following data were collected: t (minutes) [N 2 O 5 ] (mol/L) 0 1.24 * 10 –2 10. 0.92 * 10 –2 20. 0.68 * 10 –2 30. 0.50 * 10 –2 40. 0.37 * 10 –2 50. 0.28 * 10 –2 70. 0.15 * 10 –2 6. The order of this reaction in N 2 O 5 is A) 3 B) 1 C) 2 D) 0 E) none of these 7. The concentration of O 2 at t = 10. minutes is A) 2.0 * 10 –4 mol/L B) 0.32 * 10 –2 mol/L C) 0.16 * 10 –2 mol/L D) 0.64 * 10 –2 mol/L E) none of these 8. The reaction is known to be zero order in A with a rate constant of 5.0 10 -2 mol/L s at 25 o C. An experiment was run at 25 o C where [A] o = 2.6e–3 M. The half-life for the reaction is
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Exam-1-D - Fall 2010 CHEMISTRY 104 Section 001 Exam 1 Name:...

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