Chapter 9 Molecular Geometry and Bonding Theories


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Chapter 9 Molecular Geometry and Bonding Theories
Q27-Q40
27. Which of the following is not included when counting the electron domains around the central atom in VSEPR theory? A) nonbonding pair of electrons B) single covalent bond C) core level electron pair D) double covalent bond E) triple covalent bond Sect 9.2: one of the rules.

28. Which of the following has molecular geometry as square planar? A) CCl4 B) XeF4 C) PH3 D) XeF2 E) ICl3 Sect 9.2:First Draw Lewis structure and then apply Table 9.3 in p. 353. Memorize the table. Sample Exercise 9.1 and Practice Exercises 1 & 2; Sample Exercise 9.2.
29. Which one of the following species has bond angles of 90°, 120° and 180°? A) PH3 B) ClF3 C) NH3 D) AlCl3 E) PF5 Sect 9.2:First Draw Lewis structure and then apply Table 9.1 in p. 348. Memorize the table. p. 355 Sample Exercises 9.3 and Practice Exercises 1 & 2.
30. The molecular geometry of the CS2 molecule is ________. A) linear B) bent C) tetrahedral D) trigonal planar E) T-shaped Sect 9.2:First Draw Lewis structure and then apply Table 9.3 in p. 353. Memorize the table.
31. The hybridization of the oxygen atom labeled y in the structure below is ________. The C-O-H bond angle is ________.
A) sp, 180° B) sp2, 109.5° C) sp3, 109.5° D) sp3d2, 90° E) sp, 90°

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Sect 9.2: p. 355 Sample Exercises 9.3 and Practice Exercises 1 & 2. Apply Table 9.1 in p. 348. Memorize the table.
32. The bond angles marked a, b, and c in the molecule below are about ________, ________, and ________, respectively.
A) 109.5°, 109.5°, 109.5° B) 120°, 109.5°, 120° C) 109.5°, 109.5°, 120° D) 90°, 180°, 90° E) 109.5°, 109.5°, 90° Sect 9.2: p. 355 Sample Exercises 9.3 and Practice Exercises 1 & 2. Apply Table 9.1 in p. 348. Memorize the table.
33. The central S atom in the SF4 molecule has ________ unbonded electron pair(s) and ________ bonded electron pair(s) in its valence shell. A) 1, 4 B) 2, 4 C) 4, 0 D) 4, 1 E) 4, 2 Sect 9.2:First Draw Lewis structure and then answer the question. Unbounded = nondonding (p. 347)
34. Which of the following is polar? A) H2 B) O3 C) SF4 D) SF6 E) PF5 Sect 9.3. Draw Lewis structure, determine molecular geometry, and then apply symmetry (or dipole moment analysis) to determine polarity of the molecule. From symmetry viewpoint, if the molecule is symmetric, it is nonpolar; if the molecular is asymmetric, it is polar.

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35. The molecular geometry of the PF3 molecule is ________, and this molecule is ________. A) trigonal planar, polar B) trigonal planar, nonpolar C) trigonal pyramidal, polar D) trigonal pyramidal, nonpolar E) tetrahedral, unipolar Sect 9.3. Draw Lewis structure, determine molecular geometry, and then apply symmetry (or dipole moment analysis) to determine polarity of the molecule. From symmetry viewpoint, if the molecule is symmetric, it is nonpolar; if the molecular is asymmetric, it is polar.
36. Which of the following has the hybridization of the central atom as sp? A) PCl5 B) XeF4 C) PH3 D) Br3E) BeF2 Sect 9.5 Memorize Table 9.4. Focus on the total electron pairs on the central atom. Sample Exercise 9.5 and Practice Exercises 1 & 2.
37. The hybridizations of bromine in BrF5 and of arsenic in AsF5 are ________ and ________, respectively. A) sp3, sp3d B) sp3d, sp3d2 C) sp3d, sp3 D) sp3d2, sp3d E) sp3d2, sp3d2 Sect 9.5 Memorize Table 9.4. Focus on the total electron pairs on the central atom. Sample Exercise 9.5 and Practice Exercises 1 & 2.
38. How many σ bonds and π bonds are there in H3C–CH CH–C CH respectively? A) 14, 2 B) 10, 2 C) 12, 2 D) 13, 2 E) 10, 3 Sect 9.6 Know the definitions of σ bond and π bond in p. 365. Learn how to count them in p.p. 366-367.

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39. Which of the following molecules or ions will exhibit delocalized bonding?
C6H6 O3 NO3-
A) C6H6 B) NO3- only C) C6H6, O3, and NO3D) O3 and NO3E) None of the above will exhibit delocalized bonding. Sect 9.6 p.p. 368-371. Pay attention to the resonance structures. Sample Exercise 9.7 & Practice Exercises 1 & 2.
40. The C-C bond in HCCH consists of ________. A) one σ bond and one π bond B) one σ bond and two π bonds C) two σ bonds and one π bond D) two σ bonds and two π bonds E) three σ bond and two π bonds Comprehensive. Draw Lewis structure and then answer the question.

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Chapter 9 Molecular Geometry and Bonding Theories