Multiple choice, continued (3 points each). Name:__________________ Please circle your answer. There is only one correct answer to each question. 36. How many different resonance structures can be drawn for the molecule SO3 without having to violate the octet rule on the sulfur atom? A) 5 B) 4 C) 3 D) 2 37. The central atom in _______ does not violate the octet rule. A) CF4 B) KrF2 C) SF4 D) XeF4 38. For a given arrangement of ions, the lattice energy increases as ionic radius _________ and as ionic charge __________. A) increases, increases B) decreases, decreases C) increases, decreases D) decreases, increases 39. Of the molecules below, only ________ is nonpolar. A) HCl B) NH3 C) SO2 D) CO2 40. Using the table of bond dissociation energies, ∆H for the reaction 2HCl (g) + F2 (g) à 2HF (g) + Cl2 (g) is __________ kJ. Bond D (kJ/mol) H – Cl 431 F – F 155 H – F 567 Cl – Cl 242 A) –359 B) -223 C) 359 D) 223 41. Considering its Lewis structure, the electron-domain geometry of oxygen in OF2 is ___________. A) trigonal planar B) trigonal bipyramidal C) octahedral D) tetrahedral 42. The electron-domain geometry and the molecular geometry of ammonia, NH3, are __________ and __________, respectively. A) tetrahedral, trigonal pyramidal B) tetrahedral, trigonal planar C) bent, bent D) trigonal planar, bent
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