Chapter 9 Answers Key

Chapter 9 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) For a molecule with the formula AB2 the molecular shape is __________. 1) A) linear or trigonal planar B) linear or T-shaped C) trigonal planar D) T-shaped E) linear or bent 2) According to VSEPR theory, if there are five electron domains in the valence shell of an atom, they will be arranged in a(n) __________ geometry. 2) A) trigonal bipyramidal B) tetrahedral C) trigonal planar D) linear E) octahedral 3) According to VSEPR theory, if there are four electron domains in the valence shell of an atom, they will be arranged in a(n) __________ geometry. 3) A) tetrahedral B) trigonal bipyramidal C) linear D) octahedral E) trigonal planar 4) The electron-domain geometry and molecular geometry of iodine trichloride are __________ and __________, respectively. 4) A) octahedral, trigonal planar B) T-shaped, trigonal planar C) trigonal bipyramidal, trigonal planar D) tetrahedral, trigonal pyramidal E) trigonal bipyramidal, T-shaped 5) The molecular geometry of __________ is square planar. A) CCl4 B) XeF2 C) PH3 5) D) ICl3 1 E) XeF4 6) The molecular geometry of the H3O+ ion is __________. 6) A) tetrahedral B) bent C) octahedral D) trigonal pyramidal E) linear 7) The molecular geometry of the CS2 molecule is __________. 7) A) tetrahedral B) trigonal planar C) bent D) linear E) T-shaped 8) The molecular geometry of the SiH2 Cl2 molecule is __________. 8) A) tetrahedral B) T-shaped C) trigonal planar D) trigonal pyramidal E) octahedral 9) The molecular geometry of the PHCl2 molecule is __________. 9) A) trigonal planar B) trigonal pyramidal C) T-shaped D) tetrahedral E) bent 10) The molecular geometry of the CHCl3 molecule is __________. A) bent B) tetrahedral C) trigonal pyramidal D) trigonal planar E) T-shaped 2 10) 11) The molecular geometry of the SF2 molecule is __________. 11) A) bent B) octahedral C) tetrahedral D) trigonal planar E) linear 12) The molecular geometry of the PF4 + ion is __________. 12) A) octahedral B) trigonal pyramidal C) trigonal bipyramidal D) tetrahedral E) trigonal planar 13) The F-B-F bond angle in the BF2 - ion is approximately __________. A) 180° B) 90° C) 60° D) 109.5° 13) E) 120° 14) The Cl-Si-Cl bond angle in the SiCl2 F2 molecule is approximately __________. A) 180° B) 60° C) 109.5° D) 90° 14) E) 120° 15) The F-B-F bond angle in the BF3 molecule is __________. A) 90° B) 60° C) 180° 15) D) 109.5° E) 120° 16) The O-S-O bond angle in SO2 is slightly less than __________. A) 109.5° B) 60° C) 180° 16) D) 120° E) 90° 17) The F-N-F bond angle in the NF3 molecule is slightly less than __________. A) 180° B) 90° C) 60° D) 109.5° 17) E) 120° 18) According to valence bond theory, which orbitals on bromine atoms overlap in the formation of the bond in Br2 ? A) 3s B) 3p C) 4s D) 4p E) 3d 19) The electron-domain geometry of a sulfur-centered compound is trigonal bipyramidal. The hybridization of the central nitrogen atom is __________. A) sp2 B) sp3 d D) sp3 d2 C) sp 3 18) E) sp3 19) 20) The hybridization of orbitals on the central atom in a molecule is sp. The electron-domain geometry around this central atom is __________. 20) A) octahedral B) tetrahedral C) trigonal planar D) trigonal bipyramidal E) linear 21) The hybridization of orbitals on the central atom in a molecule is sp2. The electron-domain geometry about this central atom is __________. 21) A) linear B) trigonal planar C) trigonal bipyramidal D) octahedral E) tetrahedral 22) The hybridization of the carbon atom in carbon dioxide is __________. A) sp3 d2 B) sp3 C) sp2 D) sp3 d 22) E) sp 23) The hybridization of the central atom in the XeF4 molecule is __________. A) sp2 B) sp C) sp3 D) sp3 d2 23) E) sp3 d 24) The electron-domain geometry of the AsF6 - ion is octahedral. The hybrid orbitals used by the As 24) atom for bonding are __________ orbitals. A) sp3 d B) sp2 C) sp3 D) sp2 d2 E) sp3 d2 25) In order to produce sp3 hybrid orbitals, __________ s atomic orbital(s) and __________ p atomic orbital(s) must be mixed. A) two, two B) two, three C) one, two D) one, one E) one, three 26) The angles between sp2 orbitals are __________. A) 90° B) 109.5° 26) C) 120° D) 180° E) 45° 27) There are __________ σ and __________ π bonds in the H2 CCCH2 molecule. A) 4, 2 B) 6, 2 C) 2, 6 D) 6, 4 27) E) 2, 2 28) There are __________ σ and __________ π bonds in the HC≡CH molecule. A) 3 and 2 B) 3 and 4 25) C) 2 and 3 4 D) 5 and 0 28) E) 4 and 3 29) The total number of π bonds in the HC≡CC≡CC≡N molecule is __________. A) 3 B) 4 C) 6 D) 9 29) E) 12 30) There is/are __________ σ bond(s) in the molecule below. A) 1 B) 2 C) 12 30) D) 13 E) 18 31) There is/are __________ π bond(s) in the molecule below. A) 0 B) 1 C) 2 31) D) 4 E) 16 32) There is/are __________ π bond(s) in the molecule below. A) 6 B) 2 C) 1 32) D) 0 E) 7 33) The Lewis structure of carbon monoxide is given below. The hybridizations of the carbon and oxygen atoms in carbon monoxide are __________ and __________, respectively. :C≡O: A) sp, sp3 B) sp2 , sp2 C) sp, sp 5 D) sp2 , sp3 E) sp3 , sp2 33)