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Ch9: Study Packet
front 1 1) The basis of the VSEPR model of molecular bonding is ________. A) regions of electron density on an atom will organize themselves so as to maximize s-character B) regions of electron density in the valence shell of an atom will arrange themselves so as to maximize overlap C) atomic orbitals of the bonding atoms must overlap for a bond to form D) electron domains in the valence shell of an atom will arrange themselves so as to minimize repulsions E) hybrid orbitals will form as necessary to, as closely as possible, achieve spherical symmetry | back 1 D) electron domains in the valence shell of an atom will arrange themselves so as to minimize repulsions |
front 2 2) In counting the electron domains around the central atom in VSEPR theory, a ________ is not included. A) nonbonding pair of electrons B) single covalent bond C) core level electron pair D) double covalent bond E) triple covalent bond | back 2 C) core level electron pair |
front 3 3) The electron-domain geometry of ________ is tetrahedral. A) CBr4 B) PH3 C) CCl2Br2 D) XeF4 E) all of the above except XeF4 | back 3 E) all of the above except XeF4 |
front 4 4) Of the following species, ________ will have bond angles of 120°. A) PH3 B) ClF3 C) NCl3 D) BCl3 E) All of these will have bond angles of 120°. | back 4 D) BCl3 |
front 5 5) The molecular geometry of the BrO3- ion is ________. A) trigonal pyramidal B) trigonal planar C) bent D) tetrahedral E) T-shaped | back 5 A) trigonal pyramidal |
front 6  6) The molecular geometry of the left-most carbon atom in the molecule below is ________. A) trigonal planar B) trigonal bipyramidal C) tetrahedral D) octahedral E) T-shaped | back 6 C) tetrahedral |
front 7  7) The molecular geometry of the right-most carbon in the molecule below is ________. A) trigonal planar B) trigonal bipyramidal C) tetrahedral D) octahedral E) T-shaped | back 7 A) trigonal planar |
front 8  8) The bond angles marked a, b, and c in the molecule below are about ________, ________, and ________, respectively. A) 90°, 90°, 90° B) 120°, 120°, 90° C) 120°, 120°, 109.5° D) 109.5°, 120°, 109.5° E) 109.5°, 90°, 120° | back 8 D) 109.5°, 120°, 109.5° |
front 9  9) 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° | back 9 C) 109.5°, 109.5°, 120° |
front 10 10) The central Xe atom in the XeF4 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 | back 10 B) 2, 4 |
front 11 11) An electron domain consists of ________. a) a nonbonding pair of electrons b) a single bond c) a multiple bond A) a only B) b only C) c only D) a, b, and c E) b and c | back 11 D) a, b, and c |
front 12 12) The molecular geometry consists of ________. a) a nonbonding pair of electrons b) a single bond c) a multiple bond A) a only B) b only C) c only D) a, b, and c E) b and c | back 12 E) b and c |
front 13 13) The electron-domain geometry and the molecular geometry of a molecule of the general formula ABn are ________. A) never the same B) always the same C) sometimes the same D) not related E) mirror images of one another | back 13 C) sometimes the same |
front 14 14) The electron-domain geometry and the molecular geometry of a molecule of the general formula ABn will always be the same if ________. A) there are no lone pairs on the central atom B) there is more than one central atom C) n is greater than four D) n is less than four E) the octet rule is obeyed | back 14 A) there are no lone pairs on the central atom |
front 15 15) A molecule has the formula AB3 and the central atom is in a different plane from the surrounding three atoms. Its molecular shape is ________. A) tetrahedral B) trigonal pyramidal C) linear D) T-shaped E) bent | back 15 B) trigonal pyramidal |
front 16 16) PCl5 has ________ electron domains and a ________ molecular arrangement. A) 6, trigonal bipyramidal B) 6, tetrahedral C) 5, square pyramidal D) 5, trigonal bipyramidal E) 6, seesaw | back 16 D) 5, trigonal bipyramidal |
front 17 17) For molecules of the general formula ABn, n can be greater than four ________. A) for any element A B) only when A is an element from the third period or below the third period C) only when A is boron or beryllium D) only when A is carbon E) only when A is Xe | back 17 B) only when A is an element from the third period or below the third period |
front 18 Consider the following species when answering the following questions: (i) PCl3(ii) CCl4(iii) TeCl4(iv) XeF4(v) SF6 18) For which of the molecules is the molecular geometry (shape) the same as the VSEPR electron domain arrangement (electron domain geometry)? A) (i) and (ii) B) (i) and (iii) C) (ii) and (v) D) (iv) and (v) E) (v) only | back 18 C) (ii) and (v) |
front 19 19) Of the molecules below, only ________ is polar. A) CCl4 B) CH4 C) SeF4 D) SiCl4 | back 19 C) SeF4 |
front 20 20) Of the molecules below, only ________ is nonpolar. A) BF3 B) NF3 C) IF3 D) PBr3 E) BrCl3 | back 20 A) BF3 |
front 21 21) 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 | back 21 C) trigonal pyramidal, polar |
front 22 22) Of the following molecules, only ________ is polar. A) BeCl2 B) BF3 C) CBr4 D) SiH2Cl2 E) Cl2 | back 22 D) SiH2Cl2 |
front 23 23) For molecules with only one central atom, how many lone pairs on the central atom guarantees molecular polarity? A) 1 B) 2 C) 1 or 2 D) 3 E) 1 or 3 | back 23 A) 1 |
front 24 24) The molecular geometry of the CHF3 molecule is ________, and the molecule is ________. A) trigonal pyramidal, polar B) tetrahedral, nonpolar C) seesaw, nonpolar D) tetrahedral, polar E) seesaw, polar | back 24 D) tetrahedral, polar |
front 25 Consider the following species when answering the following questions: (i) PCl3(ii) CCl4(iii) TeCl4(iv) XeF4(v) SF6 25) Which of the molecules has a see-saw shape? A) (i) B) (ii) C) (iii) D) (iv) E) (v) | back 25 C) (iii) |
front 26 Consider the following species when answering the following questions: (i) PCl3(ii) CCl4(iii) TeCl4(iv) XeF4(v) SF6 26) In which of the molecules does the central atom utilize d orbitals to form hybrid orbitals? A) (i) and (ii) B) (iii) only C) (i) and (v) D) (iii), (iv), and (v) E) (v) only | back 26 D) (iii), (iv), and (v) |
front 27 27) The combination of two atomic orbitals results in the formation of ________ molecular orbitals. A) 1 B) 2 C) 3 D) 4 E) 0 | back 27 B) 2 |
front 28 28) The sp3d2 atomic hybrid orbital set accommodates ________ electron domains. A) 2 B) 3 C) 4 D) 5 E) 6 | back 28 E) 6 |
front 29 29) The sp2 atomic hybrid orbital set accommodates ________ electron domains. A) 2 B) 3 C) 4 D) 5 E) 6 | back 29 B) 3 |
front 30 30) The hybridizations of nitrogen in NF3 and NH3 are ________ and ________, respectively. A) sp2, sp2 B) sp, sp3 C) sp3, sp D) sp3, sp3 E) sp2, sp3 | back 30 D) sp3, sp3 |
front 31 31) The hybridizations of iodine in IF3 and IF5 are ________ and ________, respectively. A) sp3, sp3d B) sp3d, sp3d2 C) sp3d, sp3 D) sp3d2, sp3d E) sp3d2, sp3d2 | back 31 B) sp3d, sp3d2 |
front 32 32) The hybrid orbitals used for bonding by the sulfur atom in the SF4 molecule are ________ orbitals. A) sp B) sp2 C) sp3 D) sp3d E) sp3d2 | back 32 D) sp3d |
front 33 33) The hybrid orbitals used for bonding by Xe in the unstable XeF2 molecule are ________ orbitals. A) sp2 B) sp3 C) sp3d D) sp3d2 E) sp | back 33 C) sp3d |
front 34 34) The hybridization scheme for BeF2 is ________. A) sp B) sp2 C) sp3 D) sp3d E) sp3d2 | back 34 A) sp |
front 35  35) 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° | back 35 C) sp3, 109.5° |
front 36 36) The electron-domain geometry of the AsF5 molecule is trigonal bipyramidal. The hybrid orbitals used by the As atom for bonding are ________ orbitals. A) sp2d2 B) sp3 C) sp3d2 D) sp3d E) sp2 | back 36 D) sp3d |
front 37 37) ________ hybrid orbitals are used for bonding by Xe in the XeF4 molecule. A) sp2 B) sp3 C) sp3d D) sp3d2 E) sp | back 37 D) sp3d2 |
front 38 Consider the following species when answering the following questions: (i) PCl3(ii) CCl4(iii) TeCl4(iv) XeF4(v) SF6 38) In which of the molecules is the central atom sp3d2 hybridized? A) (i) and (ii) B) (iii) only C) (iii) and (iv) D) (iv) and (v) E) (v) only | back 38 D) (iv) and (v) |
front 39 39) When four atomic orbitals are mixed to form hybrid orbitals, how many hybrid orbitals are formed? A) one B) six C) three D) four E) five | back 39 D) four |
front 40 40) A triatomic molecule cannot be linear if the hybridization of the central atoms is ________. A) sp B) sp2 C) sp3 D) sp2 or sp3 E) sp2d or sp3d2 | back 40 D) sp2 or sp3 |
front 41 41) Valence bond theory does not address the issue of ________. A) excited states of molecules B) molecular shape C) covalent bonding D) hybridization E) multiple bonds | back 41 A) excited states of molecules |
front 42 42) A typical double bond ________. A) is stronger and shorter than a single bond B) consists of one σ bond and one π bond C) imparts rigidity to a molecule D) consists of two shared electron pairs E) All of the above answers are correct. | back 42 E) All of the above answers are correct. |
front 43 43) A typical triple bond ________. A) consists of one σ bond and two π bonds B) consists of three shared electrons C) consists of two σ bonds and one π bond D) consists of six shared electron pairs E) is longer than a single bond | back 43 A) consists of one σ bond and two π bonds |
front 44 44) In a polyatomic molecule, "localized" bonding electrons are associated with ________. A) one particular atom B) two particular atoms C) all of the atoms in the molecule D) all of the π bonds in the molecule E) two or more σ bonds in the molecule | back 44 B) two particular atoms |
front 45 45) There are ________ σ bonds and ________ π bonds in H3C–CH2–CH=CH–CH2–C CH. A) 14, 2 B) 10, 3 C) 12, 2 D) 13, 2 E) 16, 3 | back 45 E) 16, 3 |
front 46 46) Which of the following molecules or ions will exhibit delocalized bonding? SO2 SO3 SO3 2- A) SO2, SO3, and SO32- B) SO32- only C) SO2 and SO3 D) SO3 and SO32- E) None of the above will exhibit delocalized bonding. | back 46 C) SO2 and SO3 |
front 47 47) Which of the following molecules or ions will exhibit delocalized bonding? NO2- NH4+ N3- A) NH4+ and N3- B) NO2- only C) NO2-, NH4+, and N3- D) N3- only E) NO2- and N3- | back 47 B) NO2- only |
front 48 48) In order to exhibit delocalized π bonding, a molecule must have ________. A) at least two π bonds B) at least two resonance structures C) at least three σ bonds D) at least four atoms E) trigonal planar electron domain geometry | back 48 B) at least two resonance structures |
front 49 49) In a typical multiple bond, the σ bond results from overlap of ________ orbitals and the π bond(s) result from overlap of ________ orbitals. A) hybrid, atomic B) hybrid, hybrid C) atomic, hybrid D) hybrid, hybrid or atomic E) hybrid or atomic, hybrid or atomic | back 49 A) hybrid, atomic |
front 50 50) The carbon-carbon σ bond in ethylene, H2C =CH2, results from the overlap of ________. A) sp hybrid orbitals B) sp3 hybrid orbitals C) sp2 hybrid orbitals D) s atomic orbitals E) p atomic orbitals | back 50 C) sp2 hybrid orbitals |
front 51 51) The π bond in ethylene, H2C CH2, results from the overlap of ________. A) sp3 hybrid orbitals B) s atomic orbitals C) sp hybrid orbitals D) sp2 hybrid orbitals E) p atomic orbitals | back 51 E) p atomic orbitals |
front 52 52) A typical double bond consists of ________. A) three sigma bonds B) three pi bonds C) one sigma and two pi bonds D) one sigma and one pi bond E) three ionic bonds | back 52 D) one sigma and one pi bond |
front 53  53) The Lewis structure of carbon dioxide is given below. The hybridization of the carbon atom in carbon dioxide is ________. A) sp3 B) sp2 C) sp D) sp2d E) sp2d2 | back 53 C) sp |