finalexam - 1 Chemistry 6 Final Exam Name_ 1. a. (12...

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1 Chemistry 6 Final Exam Name_____________________________________ 1. a. (12 points) Using the following information, calculate the lattice energy for KCl. Ionization Potential of K = 420 kJ/mole Electron Affinity of Cl = -350 kJ/mole Standard Heat of Formation of KCl = -440 kJ/mole Standard Heat of Sublimation of K = 60 kJ/mole Bond Dissociation energy of Cl 2 = 250 kJ/mole b. (12 points) Order the following ionic solids in terms of increasing bond energy. Note that no calculations are necessary and only a very brief (one or two lines) explanation is needed. MgO, NaF, CaF 2 , KCl SECTION II. 1. A first order reaction has a half-live of 26.2 minutes. At what time will the reaction be 90% complete? a. 8.7 min. b. 87 min. c. 262 min. d. 13.1 min. e. 26.2 min. 2. The rate constant for the reaction 2HI H 2 + I 2 is 1.22 x 10 -6 M -1 s at 575 K and 1.16 x 10 -3 M s at 700 K. What is the activation energy for this reaction? a. 186 kJ mole b. 1000 kJ mole c. 81 kJ mole d. 47 kJ mole 3. The reaction between carbon monoxide and chlorine to form phosgene, Cl 2 + CO Cl 2 CO, occurs by the following mechanism: 2 + M 2Cl + M (fast equilibrium, K 1 ) Cl + CO + M ClCO + M (fast equilibrium, K 2 ) ClCO + Cl 2 Cl 2 CO + Cl (slow, k 3 ).
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2 Which one of the following rate laws is consistent with this mechanism? a. Rate = k [Cl 2 ] [CO] 1/2 b. Rate = k [Cl 2 ] [CO] 2 c. Rate = k [Cl 2 ] [CO] d. Rate = k [Cl 2 ] 1/2 [CO] e. Rate = k [Cl 2 ] 3/2 [CO] 4. The rate constant for the hypothetical reaction A + B C is 9.2 s -1 at 500 K. How long will it take for 95% of the materials to react? a. 27.6 s b. 9.2 s c. 0.67 s d. 0.33 s e. 0.15 s 5. Arrange the following atoms/ions in order of increasing ionization potential: F, Na, B + , Ne - and Ne.
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finalexam - 1 Chemistry 6 Final Exam Name_ 1. a. (12...

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