Practice Exam - Fa112006 Final Exam Morlino 50) For...

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Unformatted text preview: Fa112006 Final Exam Morlino 50) For potassium, the enthalpy of sublimation is 89 kJ/mol, and the first ionization energy is 419 kJImOL The bond dissociation energy of BIZ (g) is 193 kI/mol, and the electron affinity of bromine is —325 kjlmol. The enthalpy of vaporization of Br2 (l) is 31 kI/mol. The lattice energy of KBr is -682 kIImol. Calculate the overall enthalpy ————-v—-C~ change for the reaction: 1((5) + $439 (1) —> KBr(s) +256 _332 —780 —256 ~387 Fall 2006 Final Exam Morlino 44) Which one of the following speciesdoes rig obey the octet rule? H20 CH4 C02 N H3 BF3 45) Which of the following bonds is most ionic? C-H Mg—N C—F Si-Si K—Cl 46) Which one of the following processes would be expected to be exothermig? K (g) “’ K+(g) + 6' Brz (1) -> Brz (g) Br: (g) “> 2 Br (g) K (S) —* K (g) Br (g) + e a Br" (g) 7521112006 Final Exam Morlino 41) Which combination of elements would be most likely to form covanlfl bonds? lfihth—fluofine sodhnnmfluoflne sodium—lithium carbon—sodium carbon—fluorine 42) Which is the best Lewis structure for COS? (Formal charges are not shown.) a I CZOZ'S. I 3—1350: 2 EEC—O: 43) Which order is correct for increasing Bolarifl (least polar first)? C-C C-Cl C—F C—I A B C D A<D<B<C A<B<C<D D<C<B<A A<D<C<B C<B<A<D C-ll Fall 9006 Final anm 40) Which of the following would have the largest (most negative) lattice energy? Mng LiCI Mglz NaF KBr C—10 Fall 2006 Final Exam 31) Which of the following equations correctly describes the reaction illustrating the standard molar enthalpy of formation for C3H804 (1)? C3 (5) + H8 (g) + 04 (g) -+ C3H804 (1) 3C(graphite)+ 8H(g) + 40(g} * C3H804fl) *3C(graph1te) + 4112(5) + 202 (g) 6 C3H804 (1) 3C(graphite)+ 4H20 (1) ** C3H804 (1) 3 CH2 (g) + 2H+ (aq) + 202 (g) -* C3H804 (1) ...
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Practice Exam - Fa112006 Final Exam Morlino 50) For...

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