Practice Exam 1

Practice Exam 1 - CHEM 6B Practice Exam 1-1 (Prof. Crowell)...

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Chem 6B Practice Exam 1-1 1 - B Prof. Crowell CHEM 6B Practice Exam 1-1 (Prof. Crowell) January 18, 2008 *** FILL IN YOUR STUDENT ID NUMBER , NAME , and TEST FORM = B *** MULTIPLE CHOICE Fill in the bubble on the scantron corresponding to the correct response (26 questions worth 4 points each) 1. Which of the following has a heat of formation at standard conditions of zero (i.e. H ° f = 0)? a) H (g) b) CO (g) c) H 2 O (l) d) Cl 2 (g) e) O 2 (l) 2. What is the change in the internal energy of a system in which 3.0 kJ of work is done by the system on the surroundings and 300 J of heat is provided by the surroundings to the system? a) 2700 J b) + 3300 J c) + 2700 J d) 3300 J e) 0 J 3. Which of the following would be expected to have the largest bond enthalpy? a) CN 2+ b) CN + c) CN d) CN e) CN 2 4. For the process CHCl 3 (s) CHCl 3 (l), H ° = 9.2 kJ/mol and S ° = 43.9 J/mol. What is the melting point of CHCl 3 ? a) +483 ° C b) +63 ° C c) 63 ° C d) 10 ° C e) +10 ° C 5. Which of the following has the smallest molar entropy at 298 K? a). Cl 2 (g) b). N 2 (g) c). He (g) d). F 2 (g) e). Ne (g) 6. Calculate the change in molar entropy when the pressure of argon is allowed to double isothermally. Assume ideal behavior. a). +1.39 J K 1 mol 1 b). 1.39 J K 1 mol 1 c). 4.16 J K 1 mol 1 d). 5.76 J K 1 mol 1 e). +5.76 J K 1 mol 1 7. Calculate S surr ° at 298 K for the reaction H 2 (g) + F 2 (g) 2HF(g) H r ° = 546 kJ mol 1 , S r ° = +14.1 J K 1 mol 1 a). +14.1 J K 1 mol 1 b). +1820 J K 1 mol 1 c). +1830 J K 1 mol 1 d). 1830 J K 1 mol 1 e). 14.1 J K 1 mol 1 8. Use the following data: 2 H 2 (g) + O 2 (g) 2 H 2 O (l) H ° = 571.66 kJ H 2 (g) + O 2 (g) H 2 O 2 (aq) H ° = 187.8 kJ to calculate
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Practice Exam 1 - CHEM 6B Practice Exam 1-1 (Prof. Crowell)...

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