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Principles of Chemistry: A Molecular Approach, 3e (Tro) Chapter 10 Chemical Bonding II: Molecular Shapes, Valence Bond Theory, and Molecular Orbital Theory 1) Give the approximate bond angle for a molecule with a trigonal planar shape.

A) 109.5° B) 180° C) 120° D) 105° Answer: C Diff: 2 Var: 1 Page Ref: 10.2 Global: G2 LO: 10.1 2) Give the approximate bond angle for a molecule with a tetrahedral shape.

A) 109.5° B) 180° C) 120° D) 105° Answer: A Diff: 2 Var: 1 Page Ref: 10.2 Global: G2 LO: 10.1 3) Determine the electron geometry (eg) and molecular geometry(mg) of BCl3.

A) eg = trigonal planar, mg = trigonal planar B) eg = tetrahedral, mg = trigonal planar C) eg = tetrahedral, mg = trigonal pyramidal D) eg = trigonal planar, mg = bent E) eg = trigonal bipyramidal, mg = trigonal bipyramidal Answer: A Diff: 2 Var: 1 Page Ref: 10.2 Global: G2 LO: 10.1 4) Determine the electron geometry (eg) and molecular geometry (mg) of CO32⁻.

A) eg = tetrahedral, mg = tetrahedral B) eg = tetrahedral, mg = trigonal pyramidal C) eg = trigonal planar, mg = bent D) eg = trigonal planar, mg = trigonal planar E) eg = tetrahedral, mg = trigonal planar Answer: D Diff: 2 Var: 1 Page Ref: 10.2 Global: G2 LO: 10.1

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5) Determine the electron geometry (eg) and molecular geometry (mg) of CH31+.

A) eg = tetrahedral, mg = tetrahedral B) eg = tetrahedral, mg = trigonal pyramidal C) eg = trigonal planar, mg = bent D) eg = trigonal planar, mg = trigonal planar E) eg = tetrahedral, mg = trigonal planar Answer: D Diff: 2 Var: 1 Page Ref: 10.2 Global: G2 LO: 10.1 6) Determine the electron geometry (eg) and molecular geometry (mg) of SiF4.

A) eg = tetrahedral, mg = trigonal pyramidal B) eg = octahedral, mg = square planar C) eg = trigonal bipyramidal, mg = trigonal pyramidal D) eg = tetrahedral, mg = bent E) eg = tetrahedral, mg = tetrahedral Answer: E Diff: 2 Var: 1 Page Ref: 10.2 Global: G2 LO: 10.1 7) Determine the electron geometry (eg) and molecular geometry (mg) of PF5.

A) eg = trigonal bipyramidal, mg = trigonal bipyramidal B) eg = octahedral, mg = octahedral C) eg = trigonal bipyramidal, mg = tetrahedral D) eg = tetrahedral, mg = trigonal pyramidal E) eg = trigonal planar, mg = octahedral Answer: A Diff: 2 Var: 1 Page Ref: 10.2 Global: G2 LO: 10.1 8) Determine the electron geometry (eg) and molecular geometry (mg) of the underlined carbon in CH3CN. A) eg = tetrahedral, mg = tetrahedral B) eg = linear, mg = trigonal planar C) eg = trigonal planar, mg = bent D) eg = linear, mg = linear E) eg = trigonal planar, mg = trigonal planar Answer: D Diff: 2 Var: 1 Page Ref: 10.2 Global: G2 LO: 10.1

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9) Determine the electron geometry (eg) and molecular geometry (mg) of BrF3.

A) eg = trigonal planar, mg = trigonal planar B) eg = trigonal bipyramidal, mg = T-shape C) eg = trigonal planar, mg = bent D) eg = trigonal bipyramidal, mg = see-saw E) eg = tetrahedral, mg = trigonal pyramidal Answer: B Diff: 3 Var: 1 Page Ref: 10.4 Global: G2 LO: 10.2 10) Determine the electron geometry (eg) and molecular geometry (mg) of ICl2⁻.

A) eg = tetrahedral, mg = bent B) eg = tetrahedral, mg = trigonal pyramidal C) eg = trigonal bipyramidal, mg = linear D) eg = trigonal bipyramidal, mg = trigonal planar E) eg = octahedral, mg = linear Answer: C Diff: 3 Var: 1 Page Ref: 10.4 Global: G2 LO: 10.2 11) Determine the electron geometry (eg) and molecular geometry (mg) of XeF2.

A) eg = trigonal bipyramidal, mg = bent B) eg = linear, mg = linear C) eg = tetrahedral, mg = linear D) eg = trigonal bipyramidal, mg = linear E) eg = tetrahedral, mg = bent Answer: D Diff: 3 Var: 1 Page Ref: 10.4 Global: G2 LO: 10.2 12) Determine the electron geometry (eg) and molecular geometry (mg) of XeF4.

A) eg = tetrahedral, mg = tetrahedral B) eg = linear, mg = linear C) eg = tetrahedral, mg = bent D) eg = trigonal bipyramidal, mg = tetrahedral E) eg = octahedral, mg = square planar Answer: E Diff: 3 Var: 1 Page Ref: 10.4 Global: G2 LO: 10.2

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13) Determine the electron geometry (eg) and molecular geometry (mg) of CO2.

A) eg = tetrahedral, mg = tetrahedral B) eg = linear, mg = linear C) eg = tetrahedral, mg = bent D) eg = trigonal bipyramidal, mg = tetrahedral E) eg = octahedral, mg = square planar Answer: B Diff: 3 Var: 1 Page Ref: 10.4 Global: G2 LO: 10.2 14) Determine the electron geometry (eg) and molecular geometry (mg) of ICl4-1.

A) eg = tetrahedral, mg = tetrahedral B) eg = linear, mg = linear C) eg = tetrahedral, mg = bent D) eg = trigonal bipyramidal, mg = tetrahedral E) eg = octahedral, mg = square planar Answer: E Diff: 3 Var: 1 Page Ref: 10.4 Global: G2 LO: 10.2 15) Consider the molecule below. Determine the molecular geometry at each of the 2 labeled carbons.

A) C1 = tetrahedral, C2 = linear B) C1 = trigonal planar, C2 = bent C) C1 = bent, C2 = trigonal planar D) C1 = trigonal planar, C2 = tetrahedral E) C1 = trigonal pyramidal, C2 = see-saw Answer: D Diff: 3 Var: 1 Page Ref: 10.4 Global: G2 LO: 10.3

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16) Consider the molecule below. Determine the molecular geometry at each of the 3 labeled atoms.

A) 1 = trigonal planar, 2 = tetrahedral, 3 = trigonal pyramidal B) 1 = tetrahedral, 2 = tetrahedral, 3 = tetrahedral C) 1 = trigonal planar, 2 = tetrahedral, 3 = tetrahedral D) 1 = tetrahedral, 2 = tetrahedral, 3 = trigonal planar E) 1 = trigonal planar, 2 = trigonal pyramidal, 3 = trigonal pyramidal Answer: A Diff: 3 Var: 1 Page Ref: 10.4 Global: G2 LO: 10.3 17) Place the following in order of increasing X-Se-X bond angle, where X represents the outer atoms in each molecule.

SeO2

SeCl6

SeF2

A) SeCl6 < SeF2 < SeO2 B) SeF2 < SeO2 < SeCl6 C) SeF2 < SeCl6 < SeO2 D) SeO2 < SeF2 < SeCl6 E) SeCl6 < SeO2 < SeF2 Answer: A Diff: 4 Var: 1 Global: G2 LO: 10.2

Page Ref: 10.4

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18) Place the following in order of increasing F-A-F bond angle, where A represents the central atom in each molecule.

PF3

OF2

PF4⁺

A) PF3 < OF2 < PF4⁺ B) OF2 < PF3 < PF4⁺ C) OF2 < PF4⁺ < PF3 D) PF4⁺ < OF2 < PF3 E) PF4⁺ < PF3 < OF2 Answer: B Diff: 4 Var: 1 Global: G2 LO: 10.2

Page Ref: 10.4

19) Place the following in order of decreasing X-A-X bond angle, where A represents the central atom and X represents the outer atoms in each molecule.

N2 O

NCl3

NO2⁻

A) NCl3 > NO2⁻ > N2O B) NO2⁻ > N2O > NCl3 C) N2O > NO2⁻ > NCl3 D) NCl3 > N2O > NO2⁻ E) N2O > NCl3 > NO2⁻ Answer: C Diff: 4 Var: 1 Global: G2 LO: 10.2

Page Ref: 10.4

20) Place the following in order of decreasing X-A-X bond angle, where A represents the central atom and X represents the outer atoms in each molecule.

CS2

CF4

SCl2

A) CS2 > SCl2 > CF4 B) SCl2 > CF4 > CS2 C) CF4 > CS2 > SCl2 D) CS2 > CF4 > SCl2 E) CF4 > SCl2 > CS2 Answer: D Diff: 4 Var: 1 Global: G2 LO: 10.2

Page Ref: 10.4

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21) Place the following in order of increasing X-A-X bond angle, where A represents the central atom and X represents the outer atoms in each molecule.

HCN

H2O

H3O⁺

A) HCN < H2O < H3O⁺ B) H3O⁺ < H2O < HCN C) HCN < H3O⁺ < H2O D) H2O < HCN < H3O⁺ E) H2O < H3O⁺ < HCN Answer: E Diff: 4 Var: 1 Global: G2 LO: 10.2

Page Ref: 10.4

22) Determine the electron geometry (eg), molecular geometry (mg), and polarity of SO3.

A) eg = tetrahedral, mg = trigonal pyramidal, polar B) eg = tetrahedral, mg = tetrahedral, nonpolar C) eg = trigonal planar, mg = trigonal planar, nonpolar D) eg = trigonal bipyramidal, mg = trigonal planar, polar E) eg = trigonal pyramidal, mg = bent, nonpolar Answer: C Diff: 2 Var: 1 Page Ref: 10.5 Global: G2 LO: 10.4 23) How many of the following molecules are polar?

BrCl3 A) 1 B) 2 C) 3 D) 4 E) 0 Answer: A Diff: 3 Var: 1 Global: G2 LO: 10.4

CS2

SiF4

SO3

Page Ref: 10.5

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24) How many of the following molecules are polar?

XeCl2 A) 0 B) 3 C) 1 D) 2 E) 4 Answer: D Diff: 3 Var: 1 Global: G2 LO: 10.4

COF2

PCl4F

SF6

Page Ref: 10.5

25) How many of the following molecules are polar?

XeO2 A) 1 B) 4 C) 2 D) 3 E) 0 Answer: C Diff: 3 Var: 1 Global: G2 LO: 10.4

SiCl2Br2

C2Br2

SeCl6

Page Ref: 10.5

26) How many of the following molecules are polar?

PCl5 A) 2 B) 0 C) 1 D) 3 E) 4 Answer: D Diff: 3 Var: 1 Global: G2 LO: 10.4

COS

XeO3

SeBr2

Page Ref: 10.5

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27) Determine the electron geometry (eg), molecular geometry (mg), and polarity of SO2.

A) eg = tetrahedral, mg = bent, polar B) eg = trigonal planar, mg = bent, polar C) eg = linear, mg = linear, nonpolar D) eg = tetrahedral, mg = tetrahedral, nonpolar E) eg = trigonal pyramidal, mg = trigonal pyramidal, polar Answer: B Diff: 3 Var: 1 Page Ref: 10.5 Global: G2 LO: 10.4 28) Determine the electron geometry, molecular geometry and polarity of SF6 .

A) eg = trigonal bipyramidal, mg = trigonal bipyramidal, nonpolar B) eg = tetrahedral, mg = tetrahedral, polar C) eg = trigonal bipyramidal, mg = see-saw, polar D) eg = octahedral, mg = trigonal bipyramidal, nonpolar E) eg = octahedral, mg = octahedral, nonpolar Answer: E Diff: 3 Var: 1 Page Ref: 10.5 Global: G2 LO: 10.4 29) Determine the electron geometry, molecular geometry and polarity of TeCl6.

A) eg = octahedral, mg = octahedral, nonpolar B) eg = trigonal bipyramidal, mg = trigonal bipyramidal, nonpolar C) eg = octahedral, mg = square planar, polar D) eg = trigonal bipyramidal, mg = see-saw, polar E) eg = tetrahedral, mg = trigonal pyramidal, polar Answer: A Diff: 3 Var: 1 Page Ref: 10.5 Global: G2 LO: 10.4 30) Determine the electron geometry (eg), molecular geometry(mg) and polarity of XeO3.

A) eg = trigonal planar, mg = trigonal planar, nonpolar B) eg = tetrahedral, mg = trigonal pyramidal, polar C) eg = trigonal planar, mg = trigonal pyramidal, polar D) eg = trigonal bipyramidal, mg = trigonal planar, nonpolar E) eg = octahedral, mg = tetrahedral, nonpolar Answer: B Diff: 3 Var: 1 Page Ref: 10.5 Global: G2 LO: 10.4

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31) Determine the electron geometry, molecular geometry and polarity of HBrO2 .

A) eg = trigonal bipyramidal, mg = trigonal planar, nonpolar B) eg = octahedral, mg = square planar, nonpolar C) eg = tetrahedral, mg = trigonal pyramidal, polar D) eg = tetrahedral, mg = linear, nonpolar E) eg = linear, mg = linear, polar Answer: C Diff: 3 Var: 1 Page Ref: 10.5 Global: G2 LO: 10.4 32) Determine the electron geometry, molecular geometry and polarity around the O of CH3OH .

A) eg = trigonal bipyramidal, mg = trigonal planar, nonpolar B) eg = octahedral, mg = square planar, nonpolar C) eg = tetrahedral, mg = bent, polar D) eg = tetrahedral, mg = linear, nonpolar E) eg = linear, mg = linear, polar Answer: C Diff: 3 Var: 1 Page Ref: 10.5 Global: G2 LO: 10.4 33) Choose the compound below that contains at least one polar covalent bond, but is nonpolar.

A) HCN B) CF4 C) SeBr4 D) ICl3 E) Both B and C are nonpolar and contain a polar covalent bond.

Answer: B Diff: 3 Var: 1 Page Ref: 10.5 Global: G2 LO: 10.4 34) Choose the compound below that contains at least one polar covalent bond, but is nonpolar.

A) GeH2Br2 B) SCl2 C) AsCl5 D) CF2Cl2 E) All of the above are nonpolar and contain a polar covalent bond.

Answer: C Diff: 3 Var: 1 Page Ref: 10.5 Global: G2 LO: 10.4

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35) Place the following in order of increasing dipole moment.

I. BCl3 A) I < II = III B) II < III < I C) I < II < III D) II < I < III E) I < III < II Answer: E Diff: 3 Var: 1 Global: G2 LO: 10.4

II. BIF2

III. BClF2

Page Ref: 10.5

36) Place the following in order of decreasing dipole moment.

I. cis-CHCl=CHCl A) III > I > II B) II > I > III C) I > III > II D) II > III > I E) I = III > II Answer: A Diff: 3 Var: 1 Global: G2 LO: 10.4

II. trans-CHCl=CHCI

III. cis-CHF=CHF

Page Ref: 10.5

37) Determine the electron geometry, molecular geometry and polarity of N2O (N central).

A) eg = linear, mg = linear, nonpolar B) eg = tetrahedral, mg = linear, nonpolar C) eg = tetrahedral, mg = bent, polar D) eg = linear, mg = linear, polar E) eg = trigonal planar, mg = bent, polar Answer: D Diff: 4 Var: 1 Page Ref: 10.5 Global: G2 LO: 10.4

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38) A molecule containing a central atom with sp3 hybridization has a(n) ________ electron geometry.

A) linear B) trigonal bipyramidal C) octahedral D) tetrahedral E) bent Answer: D Diff: 1 Var: 1 Page Ref: 10.7 Global: G2 LO: 10.5 39) A molecule containing a central atom with sp3d hybridization has a(n) ________ electron geometry.

A) tetrahedral B) linear C) octahedral D) trigonal planar E) trigonal bipyramidal Answer: E Diff: 1 Var: 1 Page Ref: 10.7 Global: G2 LO: 10.5 40) Identify the number of electron groups around a molecule with a tetrahedral shape.

A) 1 B) 2 C) 3 D) 4 Answer: D Diff: 1 Var: 1 Page Ref: 10.7 Global: G2 LO: 10.5 41) Identify the shape that goes with sp3d.

A) trigonal bipyramidal B) octahedral C) tetrahedral D) trigonal planar Answer: A Diff: 1 Var: 1 Page Ref: 10.7 Global: G2 LO: 10.5

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42) A molecule containing a central atom with sp3d2 hybridization has a(n) ________ electron geometry.

A) octahedral B) trigonal bipyramidal C) tetrahedral D) trigonal planar E) trigonal pyramidal Answer: A Diff: 1 Var: 1 Page Ref: 10.7 Global: G2 LO: 10.5 43) Draw the Lewis structure for OF2. What is the hybridization on the O atom?

A) sp B) sp3 C) sp2 D) sp3d E) sp3d2 Answer: B Diff: 3 Var: 1 Global: G2 LO: 10.5

Page Ref: 10.7

44) Draw the Lewis structure for SO3. What is the hybridization on the S atom?

A) sp B) sp3 C) sp2 D) sp3d E) sp3d2 Answer: C Diff: 3 Var: 1 Global: G2 LO: 10.5

Page Ref: 10.7

45) Draw the Lewis structure for BrO4⁻. What is the hybridization on the Br atom?

A) sp B) sp3d2 C) sp3d D) sp3 E) sp2 Answer: D Diff: 3 Var: 1 Global: G2 LO: 10.5

Page Ref: 10.7

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46) Draw the Lewis structure for SF6. What is the hybridization on the S atom?

A) sp B) sp2 C) sp3 D) sp3d E) sp3d2 Answer: E Diff: 3 Var: 1 Global: G2 LO: 10.5

Page Ref: 10.7

47) Draw the Lewis structure for BrF4-. What is the hybridization on the Br atom?

A) sp3d2 B) sp3d C) sp3 D) sp2 E) sp Answer: A Diff: 3 Var: 1 Global: G2 LO: 10.5

Page Ref: 10.7

48) Draw the Lewis structure for BrCl3. What is the hybridization on the Br atom?

A) sp3d2 B) sp3d C) sp3 D) sp2 E) sp Answer: B Diff: 3 Var: 1 Global: G2 LO: 10.5

Page Ref: 10.7

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49) Consider the molecule below. Determine the hybridization at each of the 2 labeled carbons.

A) C1 = sp3, C2 = sp3d B) C1 = sp, C2 = sp2 C) C1 = sp2, C2 = sp3d D) C1 = sp3d, C2 = sp3d2 E) C1 = sp2, C2 = sp3 Answer: E Diff: 4 Var: 1 Page Ref: 10.7 Global: G2 LO: 10.5 50) Consider the molecule below. Determine the hybridization at each of the three atoms (C,C, N) from left to right

A) 1 = sp2, 2 = sp3, 3 =s p2 B) 1 = sp2, 2 = sp3, 3 = sp3 C) 1 = sp3, 2 = sp3, 3 = sp3 D) 1 = sp3, 2 = sp3, 3 = sp2 E) 1 = sp, 2 = sp2, 3 = sp2 Answer: B Diff: 4 Var: 1 Page Ref: 10.7 Global: G2 LO: 10.5

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51) From left to right, identify the hybridization on the carbons in CH3CN. A) 1 = sp3, 2 = sp3 B) 1 = sp2, 2 = sp2 C) 1 = sp, 2 = sp D) 1 = sp, 2 = sp3 E) 1 = sp3, 2 = sp Answer: E Diff: 4 Var: 1 Global: G2 LO: 10.5

Page Ref: 10.7

52) How many of the following molecules have sp hybridization on the central atom?

C2Cl2 A) 0 B) 1 C) 2 D) 3 E) 4 Answer: C Diff: 4 Var: 1 Global: G2 LO: 10.5

CO2

O3

H2O

Page Ref: 10.7

53) How many of the following molecules have sp3 hybridization on the central atom?

XeCl4 A) 0 B) 4 C) 3 D) 2 E) 1 Answer: E Diff: 4 Var: 1 Global: G2 LO: 10.5

CH4

SF4

C2H2

Page Ref: 10.7

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54) How many of the following molecules have sp3d hybridization on the central atom?

SiCl4 A) 2 B) 0 C) 4 D) 1 E) 3 Answer: A Diff: 4 Var: 1 Global: G2 LO: 10.5

BrF5

AsF5

BrF3

Page Ref: 10.7

55) How many of the following molecules have sp3d2 hybridization on the central atom?

SeCl6 A) 1 B) 3 C) 0 D) 2 E) 4 Answer: B Diff: 4 Var: 1 Global: G2 LO: 10.5

XeF4

IF5

AsCl5

Page Ref: 10.7

56) How many of the following molecules have sp2 hybridization on the central atom?

HCN A) 4 B) 3 C) 2 D) 1 E) 0 Answer: D Diff: 5 Var: 1 Global: G2 LO: 10.5

SO2

OCl2

XeCl2

Page Ref: 10.7

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57) Give the electron geometry, molecular geometry, and hybridization for CH3-.

A) eg = tetrahedral; mg = trigonal pyramidal; sp3 B) eg = tetrahedral; mg = tetrahedral; sp3 C) eg = trigonal pyramidal; mg = trigonal pyramidal; sp3 D) eg = trigonal planar; mg = trigonal planar; sp2 Answer: A Diff: 5 Var: 1 Global: G2 LO: 10.5

Page Ref: 10.7

58) List the number of sigma bonds and pi bonds in a triple bond.

A) 1 sigma, 1 pi B) 2 sigma, 1 pi C) 2 sigma, 2 pi D) 1 sigma, 2 pi Answer: D Diff: 5 Var: 1 Page Ref: 10.7 Global: G2 59) Draw the Lewis structure for the molecule CH2CHCH3. How many sigma and pi bonds does it contain?

A) 8 sigma, 1 pi B) 9 sigma, 0 pi C) 9 sigma, 1 pi D) 7 sigma, 2 pi E) 8 sigma, 2 pi Answer: A Diff: 5 Var: 1 Global: G2

Page Ref: 10.7

60) Consider the following compound. How many sigma and pi bonds does it contain?

CH3CHCHCO2H A) 9 sigma, 4 pi B) 11 sigma, 2 pi C) 9 sigma, 2 pi D) 13 sigma, 0 pi E) 6 sigma, 2 pi Answer: B Diff: 5 Var: 1 Page Ref: 10.7 Global: G2

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61) Draw the Lewis structure for the molecule C3H4. How many sigma and pi bonds does it contain?

A) 7 sigma, 1 pi B) 8 sigma, 0 pi C) 6 sigma, 2 pi D) 10 sigma, 0 pi E) 8 sigma, 2 pi Answer: C Diff: 5 Var: 1 Page Ref: 10.7 Global: G2 62) How many of the following molecules contain at least one pi bond?

C2H6 A) 0 B) 1 C) 3 D) 4 E) 2 Answer: C Diff: 5 Var: 1 Global: G2

Cl2CO

C2Cl4

SeS3

Page Ref: 10.7

63) Which of the following statements is true?

A) The total number of molecular orbitals formed doesn't always equal the number of atomic orbitals in the set.

B) A bond order of 0 represents a stable chemical bond.

C) When two atomic orbitals come together to form two molecular orbitals, one molecular orbital will be lower in energy than the two separate atomic orbitals, and one molecular orbital will be higher in energy than the separate atomic orbitals.

D) Electrons placed in antibonding orbitals stabilize the ion/molecule.

E) All of the above are true.

Answer: C Diff: 3 Var: 1 Page Ref: 10.8 Global: G2 LO: 10.6

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Match the following.

A) polar B) s2p hybridized central atom C) see-saw molecular geometry D) sp hybridized central atom E) nonpolar, but contains a polar covalent bond F) octahedral electron geometry G) polar, but contains no polar bonds.

64) SF4 Diff: 3 Var: 1 Global: G2 LO: 10.2

Page Ref: 10.4

65) XeCl4 Diff: 3 Var: 1 Global: G2 LO: 10.2

Page Ref: 10.4

66) CH2F2 Diff: 2 Var: 1 Global: G2 LO: 10.4

Page Ref: 10.5

67) BCl3 Diff: 2 Var: 1 Global: G2 LO: 10.4

Page Ref: 10.5

68) BeF2 Diff: 2 Var: 1 Global: G2 LO: 10.5

Page Ref: 10.7

Answers: 64) C 65) F 66) A 67) E 68) D 69) Describe a square planar shape.

Answer: Four bonding pairs and two lone pairs Diff: 2 Var: 1 Page Ref: 10.3 Global: G2

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70) Is it possible for a molecule to be nonpolar even though it contains polar bonds? Explain your answer and give an example.

Answer: Yes. The polarity of a molecule depends on the molecular geometry and whether or not all of the dipoles (polar bonds) cancel one another. If the molecular geometry causes all of the dipoles to cancel, the molecule will be nonpolar. An example is CF4 where there are four polar bonds, but the dipoles sum to 0 making the molecule nonpolar.

Diff: 1 Var: 1 Page Ref: 10.5 Global: G2, G8 LO: 10.4 71) Explain why oil and water do not mix.

Answer: Water molecules are polar and oil molecules are not polar.

Diff: 1 Var: 1 Page Ref: 10.5 Global: G2, G8 72) Identify the molecular geometry in the carbons of the structure below.

CH2CHCCCH3 Answer: The first two carbons are trigonal planar, the third and fourth carbons are linear, and the last carbon is tetrahedral.

Diff: 5 Var: 1 Page Ref: 10.7 Global: G2 LO: 10.5 73) Give the electron geometry, molecular geometry, and hybridization for both carbons in CH3COOH. Answer: eg = tetrahedral; mg = tetrahedral; sp3 and eg = trigonal planar; mg = trigonal planar; sp2 Diff: 5 Var: 1 Page Ref: 10.7 Global: G2 LO: 10.5 74) Determine the hybridization about each carbon atom in the following structure.

CH2CHCCCH3 Answer: The first 2 C's are sp2 hybridized, the next 2 C's are sp hybridized and the last C is sp3 hybridized.

Diff: 5 Var: 1 Page Ref: 10.7 Global: G2 LO: 10.5 75) According to molecular orbital theory, what is an antibonding orbital?

Answer: An antibonding orbital is formed when 2 orbitals destructively interfere with one another. An antibonding orbital is usually higher in energy than the two separated atoms and has a node in the internuclear region.

Diff: 2 Var: 1 Page Ref: 10.8 Global: G2, G8 LO: 10.6

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76) What geometric arrangement of charge clouds is expected for an atom that has four charge clouds?

A) trigonal bipyramidal B) octahedral C) tetrahedral D) square planar Answer: C Diff: 1 Var: 5 Page Ref: 10.2 Global: G2 LO: 10.1 77) What is the molecular geometry of ClF4-?

A) seesaw B) square planar C) square pyramidal D) tetrahedral Answer: B Diff: 3 Var: 5 Page Ref: 10.4 Global: G2 LO: 10.2 78) What is the molecular geometry of NCl3?

A) T-shaped B) tetrahedral C) trigonal planar D) trigonal pyramidal Answer: D Diff: 3 Var: 5 Page Ref: 10.4 Global: G2 LO: 10.2 79) What is the molecular geometry of SF5-?

A) octahedral B) seesaw C) square pyramidal D) trigonal bipyramidal Answer: C Diff: 3 Var: 5 Page Ref: 10.4 Global: G2 LO: 10.2

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80) Which of the following best describes ClF2-? It has a molecular geometry that is A) linear with no lone pairs on the Cl atom.

B) linear with lone pairs on the Cl atom.

C) nonlinear with no lone pairs on the Cl atom.

D) nonlinear with lone pairs on the Cl atom.

Answer: B Diff: 3 Var: 5 Page Ref: 10.4 Global: G2 LO: 10.2 81) What is the molecular geometry of TeCl4?

A) seesaw B) square planar C) square pyramidal D) tetrahedral Answer: A Diff: 3 Var: 5 Page Ref: 10.4 Global: G2 LO: 10.2 82) Using the VSEPR model, the electron-domain geometry of the central atom in BrF4- is ________.

A) linear B) trigonal planar C) tetrahedral D) trigonal bipyramidal E) octahedral Answer: E Diff: 3 Var: 6 Page Ref: 10.4 Global: G2 LO: 10.2 83) Using the VSEPR model, the molecular geometry of the central atom in XeF2 is ________.

A) linear B) trigonal planar C) tetrahedral D) bent E) trigonal pyramidal Answer: A Diff: 3 Var: 9 Page Ref: 10.4 Global: G2 LO: 10.2

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84) Using the VSEPR model, the molecular geometry of the central atom in BF3 is ________.

A) linear B) trigonal planar C) tetrahedral D) bent E) trigonal pyramidal Answer: B Diff: 3 Var: 5 Page Ref: 10.4 Global: G2 LO: 10.2 85) Using the VSEPR model, the molecular geometry of the central atom in CF4 is ________.

A) linear B) trigonal planar C) tetrahedral D) bent E) trigonal pyramidal Answer: C Diff: 3 Var: 6 Page Ref: 10.4 Global: G2 LO: 10.2 86) Using the VSEPR model, the molecular geometry of the central atom in SO2 is ________.

A) linear B) trigonal planar C) tetrahedral D) bent E) trigonal pyramidal Answer: D Diff: 3 Var: 7 Page Ref: 10.4 Global: G2 LO: 10.2 87) Using the VSEPR model, the molecular geometry of the central atom in NCl3 is ________.

A) linear B) trigonal planar C) tetrahedral D) bent E) trigonal pyramidal Answer: E Diff: 3 Var: 7 Page Ref: 10.4 Global: G2 LO: 10.2

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88) Using the VSEPR model, the molecular geometry of the central atom in XeF4 is ________.

A) tetrahedral B) seesaw C) square planar D) trigonal bipyramidal E) square pyramidal Answer: C Diff: 3 Var: 15 Page Ref: 10.4 Global: G2 LO: 10.2 89) Using the VSEPR model, the electron-domain geometry of the central atom in BF3 is ________.

A) linear B) trigonal planar C) tetrahedral D) trigonal bipyramidal E) octahedral Answer: B Diff: 3 Var: 7 Page Ref: 10.4 Global: G2 LO: 10.3 90) Using the VSEPR model, the electron-domain geometry of the central atom in SF2 is ________.

A) linear B) trigonal planar C) tetrahedral D) trigonal bipyramidal E) octahedral Answer: C Diff: 3 Var: 16 Page Ref: 10.4 Global: G2 LO: 10.3 91) Using the VSEPR model, the electron-domain geometry of the central atom in SF4 is ________.

A) linear B) trigonal planar C) tetrahedral D) trigonal bipyramidal E) octahedral Answer: D Diff: 3 Var: 8 Page Ref: 10.4 Global: G2 LO: 10.3

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92) What is the O-B-O bond angle in BO33-?

A) less than 109.5° B) 109.5° C) 120° D) greater than 120° Answer: C Diff: 3 Var: 5 Page Ref: 10.4 Global: G2 LO: 10.2 93) What are the F-Po-F bond angles in PoF6 ?

A) 60° B) 90° C) 109.5° D) 120° Answer: B Diff: 3 Var: 5 Global: G2 LO: 10.2

Page Ref: 10.4

94) The VSEPR model predicts the H—O—H bond angle in H3O+ to be ________.

A) 60° B) 90° C) less than 109.5° but greater than 90° D) 109.5° Answer: C Diff: 3 Var: 5 Page Ref: 10.4 Global: G2 LO: 10.2 95) The orbital hybridization on the carbon atoms in C2H2 is ________.

A) sp B) sp2 C) sp3 D) sp3d2 Answer: A Diff: 2 Var: 5 Global: G2 LO: 10.5

Page Ref: 10.7

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96) The hybrid orbital set used by the central atom in NO3- is ________.

A) sp B) sp2 C) sp3 D) sp3d E) sp3d2 Answer: B Diff: 2 Var: 7 Global: G2 LO: 10.5

Page Ref: 10.7

97) The hybrid orbital set used by the central atom in NCl3 is ________.

A) sp B) sp2 C) sp3 D) sp3d E) sp3d2 Answer: C Diff: 2 Var: 16 Global: G2 LO: 10.5

Page Ref: 10.7

98) The hybrid orbital set used by the central atom in KrF2 is ________.

A) sp B) sp2 C) sp3 D) sp3d E) sp3d2 Answer: D Diff: 2 Var: 8 Global: G2 LO: 10.5

Page Ref: 10.7

99) What is the molecular geometry of SBr4?

A) seesaw B) square planar C) square pyramidal D) tetrahedral Answer: A Diff: 3 Var: 9 Page Ref: 10.4 Global: G2 LO: 10.4

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100) A molecule containing a central atom with sp3d2 hybridization has a(n) ________ electron geometry.

A) octahedral B) trigonal bipyramidal C) tetrahedral D) bent E) trigonal planar Answer: A Diff: 1 Var: 8 Page Ref: 10.7 Global: G2 LO: 10.5 101) Which of the following does not affect the shape of a molecule as per VSEPR model?

A) electron groups on terminal atoms B) electron groups on the central atom C) number of lone pairs on the central atom D) any one of the above Answer: A Diff: 1 Var: 1 Page Ref: 10.2 Global: G2 LO: 10.1 102) Which will make the molecule AB2 bent in shape?

A) the bonding electrons B) the nonbonding electrons C) the lone pairs on atom A D) the bond pairs Answer: C Diff: 1 Var: 1 Page Ref: 10.3 Global: G2 LO: 10.2 103) How many electrons are present in the bonding MO orbital of H2?

A) 2 B) 0 C) 1 D) 4 Answer: A Diff: 1 Var: 1 Global: G2 LO: 10.6

Page Ref: 10.8

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104) How many electrons are present in the antibonding MO orbital of He2?

A) 0 B) 1 C) 2 D) 4 Answer: C Diff: 1 Var: 1 Global: G2 LO: 10.6

Page Ref: 10.8

105) What is the bond order in He2 molecule?

A) 0 B) 1 C) 1/2 D) 2 Answer: A Diff: 1 Var: 1 Global: G2 LO: 10.6

Page Ref: 10.8

106) What is the bond order in He2+ ion?

A) 0 B) 1 C) 1/2 D) 2 Answer: C Diff: 1 Var: 1 Global: G2 LO: 10.6

Page Ref: 10.8

107) According to the MO theory, which of the following molecules should not exist?

A) He2+ B) He2 C) H2+ D) All of the above Answer: B Diff: 1 Var: 1 Page Ref: 10.8 Global: G2 LO: 10.6

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108) The paramagnetic property of a molecule is due to the presence of unpaired electrons. Which of the following molecules is paramagnetic according to MO theory?

A) O2 B) N2 C) F2 D) H2 Answer: A Diff: 1 Var: 1 Global: G2 LO: 10.6

Page Ref: 10.8

109) Which molecule has unpaired electrons?

A) N2 B) O2 C) F2 D) H2 Answer: B Diff: 1 Var: 1 Global: G2 LO: 10.6

Page Ref: 10.8

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