Central Science: Chapter 9 Flashcards


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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

D

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

C

3

The electron-domain geometry of ________ is tetrahedral.
A) CBr4
B) PH3
C) CCl2Br2
D) XeF4
E) all of the above except XeF4

E

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°.

D

5

The molecular geometry of the BrO3- ion is ________.
A) trigonal pyramidal
B) trigonal planar
C) bent
D) tetrahedral
E) T-shaped

A

6
card image

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

C

7
card image

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

A

8
card image

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°

D

9
card image

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°

C

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

B

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

D

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

E

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

C

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

A

15

What is the molecular shape of H2O?
A) T-shaped
B) tetrahedral
C) linear
D) trigonal pyramidal
E) bent

E

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

D

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

B

18

For which of the molecules is the molecular geometry (shape) the same as the VSEPR electron domain arrangement (electron domain geometry)?

(i) BCl3 (ii) CCl4 (iii) TeCl4 (iv) XeF4 (v) SF6

A) (i) and (ii)
B) (i) and (iii)
C) (ii) and (v)
D) (iv) and (v)
E) (v) only

C

19

Of the molecules below, only ________ is polar.

(i) BCl3 (ii) CCl4 (iii) TeCl4 (iv) XeF4 (v) SF6

A) CCl4
B) CH4
C) SeF4
D) SiCl4

C

20

Of the molecules below, only ________ is nonpolar.

(i) BCl3 (ii) CCl4 (iii) TeCl4 (iv) XeF4 (v) SF6

A) BF3
B) NF3
C) IF3
D) PBr3
E) BrCl3

A

21

Three monosulfur fluorides are observed: SF2, SF4, and SF6. Of these, ________ is/are polar.
A) SF2 only
B) SF2 and SF4 only
C) SF4 only
D) SF6 only
E) SF2, SF4, and SF6

B

22

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

C

23

Of the following molecules, only ________ is polar.
A) BeCl2
B) BF3
C) C
D) SiH2Cl2
E) Cl2

D

24

Of the following molecules, only ________ is polar.
A) CCl4
B) BCl3
C) NCl3
D) BeCl2
E) Cl2

C

25

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

A

26

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

D

27

The molecular geometry of the BCl3 molecule is ________, and this molecule is ________.
A) trigonal pyramidal, polar
B) trigonal pyramidal, nonpolar
C) trigonal planar, polar
D) trigonal planar, nonpolar
E) trigonal bipyramidal, polar

D

28

Which of the molecules has a see-saw shape?

(i) BCl3 (ii) CCl4 (iii) TeCl4 (iv) XeF4 (v) SF6

A) (i)
B) (ii)
C) (iii)
D) (iv)
E) (v)

C

29

Which of the molecules has a square planar shape?

(i) BCl3 (ii) CCl4 (iii) TeCl4 (iv) XeF4 (v) SF6

A) (i) and (ii)
B) (i) and (v)
C) (iii) only
D) (ii) and (iv)
E) (iv) only

E

30

The combination of two atomic orbitals results in the formation of ________ molecular orbitals.
A) 1
B) 2
C) 3
D) 4
E) 0

B

31

Of the following, the central atom is sp3d2 hybridized only in ________.
A) PCl5
B) XeF4
C) PH3
D) Br3-
E) BeF2

B

32

The sp3d2 atomic hybrid orbital set accommodates ________ electron domains.
A) 2
B) 3
C) 4
D) 5
E) 6

E

33

The sp2 atomic hybrid orbital set accommodates ________ electron domains.
A) 2
B) 3
C) 4
D) 5
E) 6

B

34

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

D

35

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

B

36

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

D

37

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

D

38

What are the hybrid orbitals used for bonding by Xe in a XeCl4 molecule?
A) sp2
B) sp3d2
C) sp3
D) sp3d
E) sp

B

39

The hybridization scheme for BeF2 is ________.
A) sp
B) sp2
C) sp3
D) sp3d
E) sp3d2

A

40
card image

What is the hybridization of the carbon atom attached to the two oxygen atoms in the structure below?

A) sp3
B) sp
C) sp3d2
D) sp2
E) sp3d

D

41

What is the hybridization of the I atom in a IF5 molecule?
A) sp2d2
B) sp3d
C) sp3
D) sp3d2
E) sp2

D

42

________ hybrid orbitals are used for bonding by Xe in the XeF4 molecule.
A) sp2
B) sp3
C) sp3d
D) sp3d2
E) sp

D

43

In which of the molecules is the central atom sp2 hybridized?

(i) BCl3 (ii) CCl4 (iii) TeCl4 (iv) XeF4 (v) SF6

A) (i) only
B) (i) and (ii)
C) (iii) and (iv)
D) (iii) only
E) (iv) and (v)

A

44

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

D

45

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

D

46

Valence bond theory addresses all of the following except ________.
A) molecular shape
B) covalent bonding
C) excited states of molecules
D) hybridization
E) multiple bonds

C

47

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.

E

48

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

A

49

In a SO42- ion, "localized" bonding electrons are associated with ________ particular atoms.
A) zero
B) one
C) two
D) three
E) four

C

50

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

E

51

Which of the following molecules or ions have various resonance structures?
CO2 O3 CO32-

A) CO2, O3, and CO32-
B) CO2 and O3
C) O3 and CO32-
D) CO32- only
E) None of the above will exhibit delocalized bonding.

C

52

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-

B

53

A molecule must have at least two resonance structures in order to display ________.
A) delocalized σ bonding
B) trigonal planar electron group geometry
C) localized π bonding
D) delocalized π bonding
E) localized σ bonding

D

54

In a C=C bond, the σ bond results from overlap of ________ orbitals and the π bond(s) result from overlap of ________ orbitals.
A) sp2-hybrid, p-atomic
B) sp2-atomic, p-hybrid
C) sp3-hybrid, p-atomic
D) sp-hybrid, p-atomic
E) σ-atomic, π-hybrid

A

55

The carbon-hydrogen σ bond in ethylene, H2C CH2, results from the overlap of ________.
A) sp2-hybrid and s-atomic orbitals
B) sp hybrid orbitals
C) sp3 hybrid orbitals
D) s-hybrid and sp2-atomic orbitals
E) s atomic orbitals

A

56

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

E

57

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

D

58

The N-H bond in ammonia consists of ________.
A) one σ bond and one π bond
B) one σ bond and no π bonds
C) one σ bond and two π bonds
D) two σ bonds and one π bond
E) two σ bonds and two π bonds

B

59

The hybridization of the terminal carbons in the H2C C CH2 molecule is ________.
A) sp
B) sp2
C) sp3
D) sp3d
E) sp3d2

B

60

The hybridization of nitrogen in the H—C N: molecule is ________.
A) sp
B) s2p
C) s3p
D) sp2
E) sp3

A

61

The hybridization of carbon in the H-C C-H molecule is ________.
A) sp2
B) sp
C) s2p
D) s3p
E) sp3

B

62
card image

The hybridization of the carbon atom labeled x in the molecule below is ________.

A) sp
B) sp2
C) sp3
D) sp3d
E) sp3d2

B

63
card image

The hybridization of the oxygen atom labeled x in the structure below is ________.

A) sp
B) sp2
C) sp3
D) sp3d
E) sp3d2

B

64

The hybridization and molecular shape of the carbon atom in carbon dioxide is ________.
A) sp and linear
B) sp3 and bent
C) sp2 and linear
D) sp2d and bent
E) sp2d2 and linear

A

65

Electrons in ________ bonds remain localized between two atoms. Electrons in ________ bonds can become delocalized between more than two atoms.
A) pi, sigma
B) sigma, pi
C) pi, pi
D) sigma, sigma
E) ionic, sigma

B

66

Structural changes around a ________ bond in the retinal portion of the rhodopsin molecule trigger the chemical reactions that result in vision.
A) C=C
B) C-C
C) C≡C
D) C-H
E) C=N

A

67

The bond order of any molecule containing equal numbers of bonding and antibonding electrons is ________.
A) 0
B) 1
C) 2
D) 3
E) 1/2

A

68

In comparing the same two atoms bonded together, the ________ the bond order, the ________ the bond length, and the ________ the bond energy.
A) greater, shorter, greater
B) greater, greater, greater
C) greater, longer, greater
D) smaller, longer, smaller
E) smaller, greater, greater

D

69

In comparing the same two atoms bonded together, the ________ the bond order, the ________ the bond length, and the ________ the bond energy.
A) greater, shorter, greater
B) greater, greater, greater
C) greater, longer, greater
D) greater, greater, smaller
E) smaller, greater, greater

A

70

Based on molecular orbital theory, the bond orders of the H—H bonds in H2, H2+, and H2- are ________, respectively
A) 1, 0, and 0
B) 1, 1/2, and 0
C) 1, 0, and 1/2
D) 1, 1/2, and 1/2
E) 1, 2, and 0

D

71

Based on molecular orbital theory, the bond order of the H—H bond in the H2+ ion is ________.
A) 0
B) 1/2
C) 1
D) 3/2
E) 2

B

72

An antibonding π orbital contains a maximum of ________ electrons.
A) 1
B) 2
C) 4
D) 6
E) 8

B

73

According to MO theory, overlap of two s atomic orbitals produces ________.
A) one bonding molecular orbital and one hybrid orbital
B) two bonding molecular orbitals
C) two bonding molecular orbitals and two antibonding molecular orbitals
D) two bonding molecular orbitals and one antibonding molecular orbital
E) one bonding molecular orbital and one antibonding molecular orbital

E

74

A molecular orbital can accommodate a maximum of ________ electron(s).
A) 1
B) 2
C) 4
D) 6
E) 12

B

75

Molecular Orbital theory correctly predicts paramagnetism of oxygen gas, O2. This is because ________.
A) the bond order in O2 can be shown to be equal to 2
B) there are more electrons in the bonding orbitals than in the antibonding orbitals
C) the energy of the π2p MOs is higher than that of the σ2p MO
D) there are two unpaired electrons in the MO electron configuration of O2
E) the O—O bond distance is relatively short

D

76

Molecular Orbital theory correctly predicts diamagnetism of fluorine gas, F2. This is because ________.
A) the bond order in F2 can be shown to be equal to 1
B) there are more electrons in the bonding orbitals than in the antibonding orbitals
C) all electrons in the MO electron configuration of F2 are paired
D) the energy of the π2pMOs is higher than that of the σ2p MO
E) the F—F bond enthalpy is very low

C`

77

Based on molecular orbital theory, the only molecule in the list below that has unpaired electrons is ________.
A) C2
B) N2
C) F2
D) O2
E) Li2

D

78

According to molecular orbital theory, how many unpaired electrons are in a peroxide ion, O22-?
A) 0
B) 1/2
C) 1
D) 2
E) 3

A

79

According to molecular orbital theory, the bond order of N-N in nitrogen gas is ________.
A) 0
B) 1/2
C) 1
D) 2
E) 3

E

80

According to molecular orbital theory, the bond order of He-He in the He2 molecule is ________.
A) 0
B) 1
C) 2
D) 3
E) 4

A

81

Which of the following is expected to be paramagnetic?
A) F2
B) O2
C) N2
D) H2
E) He

B

82

Which of the following molecules would be expected to be attracted to a magnetic field?

F2 N2 O2

A) F2 and N2
B) F2 and O2
C) O2 only
D) N2 only
E) N2 and O2

C

83

According to MO theory, overlap of two p atomic orbitals produces ________.
A) two bonding molecular orbitals
B) one bonding molecular orbital and one antibonding molecular orbital
C) two bonding molecular orbitals and two antibonding molecular orbitals
D) two bonding molecular orbitals and one antibonding molecular orbital
E) three bonding molecular orbitals and three antibonding molecular orbitals

B

84

According to MO theory, overlap of two p atomic orbitals produces ________.
A) one π MO and one σ* MO
B) one π MO and one σ MO
C) one π MO and one π* MO or one σ MO and one σ* MO
D) one π+ MO and one σ* MO
E) two π MOs, two π+ MOs, one σ MO, and one σ* MO

C

85

An antibonding MO ________ the corresponding bonding MO.
A) is always lower in energy than
B) can accommodate more electrons than
C) can accommodate fewer electrons than
D) is always higher in energy than
E) is always degenerate with

D

86

The more effectively two atomic orbitals overlap, ________.
A) the more bonding MOs will be produced by the combination
B) the higher will be the energy of the resulting bonding MO and the lower will be the energy of the resulting antibonding MO
C) the higher will be the energies of both bonding and antibonding MOs that result
D) the fewer antibonding MOs will be produced by the combination
E) the lower will be the energy of the resulting bonding MO and the higher will be the energy of the resulting antibonding MO

E

87

The bond order of a homonuclear diatomic molecule can be decreased by ________.
A) removing electrons from a bonding MO or adding electrons to an antibonding MO
B) adding electrons to a bonding MO or removing electrons from an antibonding MO
C) adding electrons to any MO
D) removing electrons from any MO
E) The bond order of a homonuclear diatomic molecule cannot be decreased by any means.

A

88

The order of MO energies in B2, C2, and N2 (σ2p > π2p), is different from the order in O2, F2, and Ne2(σ2P2P). This is due to ________.

A) less effective overlap of p orbitals in O2, F2, and Ne2
B) the more metallic character of boron, carbon and nitrogen as compared to oxygen, fluorine, and neon
C) greater 2s-2p interaction in O2, F2, and Ne2
D) greater 2s-2p interaction in B2, C2, and N2
E) less effective overlap of p orbitals in B2, C2, and N2

D

89

For a molecule with the formula AB2, the molecular shape is ________.
A) linear or bent
B) linear or trigonal planar
C) linear or T-shaped
D) T-shaped
E) trigonal planar

A

90

For a molecule with the formula AB3, the molecular shape is ________.
A) linear, octahedral, or bent
B) linear, bent, or trigonal planar
C) linear, bent, or T-shaped
D) tetrahedral
E) trigonal planar, trigonal pyramidal, or T-shaped

E

91

The molecular geometry of ________ is square planar.
A) CCl4
B) XeF4
C) PH3
D) XeF2
E) ICl3

B

92

The molecular geometry of the CS2 molecule is ________.
A) linear
B) bent
C) tetrahedral
D) trigonal planar
E) T-shaped

A

93

The molecular geometry of the SiH2Cl2 molecule is ________.
A) trigonal planar
B) tetrahedral
C) trigonal pyramidal
D) octahedral
E) T-shaped

B

94

The molecular geometry of the PHCl2 molecule is ________.
A) bent
B) trigonal planar
C) trigonal pyramidal
D) tetrahedral
E) T-shaped

C

95

The molecular geometry of the CHCl3 molecule is ________.
A) bent
B) trigonal planar
C) trigonal pyramidal
D) tetrahedral
E) T-shaped

D

96

The molecular geometry of the SF2 molecule is ________.
A) linear
B) bent
C) trigonal planar
D) tetrahedral
E) octahedral

B

97

The molecular geometry of the PF4+ ion is ________.
A) octahedral
B) tetrahedral
C) trigonal pyramidal
D) trigonal planar
E) trigonal bipyramidal

B

98

The F-B-F bond angle in the BF2- ion is approximately ________.
A) 90°
B) 109.5°
C) 120°
D) 180°
E) 60°

C

99

The Cl-Si-Cl bond angle in the SiCl2F2 molecule is approximately ________.
A) 90°
B) 109.5°
C) 120°
D) 180°
E) 60°

B

100

The F-B-F bond angle in the BF3 molecule is ________.
A) 90°
B) 109.5°
C) 120°
D) 180°
E) 60°

C

101

The H-B-H bond angle in BH3 is ________.
A) 180°
B) 90°
C) 109.5°
D) 60°
E) 120°

E

102

The F-N-F bond angle in the NF3 molecule is slightly less than ________.
A) 90°
B) 109.5°
C) 120°
D) 180°
E) 60°

B

103

The molecular geometry of the H3O+ ion is ________.
A) linear
B) tetrahedral
C) bent
D) trigonal pyramidal
E) octahedral

D

104

The electron-domain geometry of a sulfur-centered compound is trigonal bipyramidal. The hybridization of the central sulfur atom is ________.
A) sp
B) sp2
C) sp3
D) sp3d
E) sp3d2

D

105

The hybridization of orbitals on the central atom in a molecule is sp. The electron-domain geometry around this central atom is ________.
A) octahedral
B) linear
C) trigonal planar
D) trigonal bipyramidal
E) tetrahedral

B

106

The hybridization of orbitals on the central atom in a molecule is sp2. The electron-domain geometry about this central atom is ________.
A) octahedral
B) linear
C) trigonal planar
D) trigonal bipyramidal
E) tetrahedral

C

107

The hybridization of the carbon atom in carbon dioxide is ________.
A) sp
B) sp2
C) sp3
D) sp3d
E) sp3d2

A

108

The hybridization of the central atom in the XeF4 molecule is ________.
A) sp
B) sp2
C) sp3
D) sp3d
E) sp3d2

E

109

The electron-domain geometry of the AsF6- ion is octahedral. The hybrid orbitals used by the As atom for bonding are ________ orbitals.
A) sp2d2
B) sp3
C) sp3d
D) sp3d2
E) sp2

D

110

In order to produce sp3 hybrid orbitals, ________ s atomic orbital(s) and ________ p atomic orbital(s) must be mixed.
A) one, two
B) one, three
C) one, one
D) two, two
E) two, three

B

111

In order to produce sp2 hybrid orbitals, ________ s atomic orbital(s) and ________ p atomic orbital(s) must be mixed.
A) one, two
B) one, three
C) one, one
D) two, two
E) two, three

A

112

The angles between sp2 orbitals are ________.
A) 45°
B) 180°
C) 90°
D) 109.5°
E) 120°

E

113

There are ________ σ and ________ π bonds in the H—C≡C—H molecule.
A) 3, 2
B) 3, 4
C) 4, 3
D) 2, 3
E) 5, 0

A

114

There are ________ σ and ________ π bond(s) in the H2C=CH2 molecule.
A) 3, 2
B) 3, 4
C) 4, 3
D) 2, 3
E) 5, 1

E

115

There are ________ σ and ________ π bonds in the H2C=C=CH2 molecule.
A) 4, 2
B) 6, 4
C) 2, 2
D) 2, 6
E) 6, 2

E

116

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
E) 12

C

117
card image

There is/are ________ σ bond(s) in the molecule below.

A) 1
B) 2
C) 12
D) 13
E) 18

C

118
card image

There is/are ________ π bond(s) in the molecule below.

A) 0
B) 1
C) 2
D) 4
E) 16

C

119
card image

There is/are ________ π bond(s) in the molecule below.

A) 7
B) 6
C) 2
D) 1
E) 0

D

120

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, sp3
C) sp3, sp2
D) sp, sp
E) sp2, sp2

D

121

How may lone pair electrons are found on the central atom in a ClF3 molecule which has a "T-shaped" geometry?
A) 2
B) 3
C) 1
D) 4
E) 0

A

122

The electron domain and molecular geometry of SO3 are ________.
A) trigonal bipyramidal, trigonal planar
B) trigonal planar, bent
C) trigonal bipyramidal, T-shaped
D) trigonal planar, trigonal planar
E) octahedral, seesaw

D

123

The H-C-H bond angle in the CH4 ion is approximately ________.
A) 180
B) 120
C) 109.5
D) 60
E) 90

C

124
card image

The bond angle marked a in the following molecule is about ________.

A) 109.5
B) 60
C) 180
D) 120
E) 90

D

125

The central atom in the ICl4- ion has ________ nonbonded electron pair(s) and ________ bonded electron pair(s) in its valence shell.
A) 4, 2
B) 0, 4
C) 2, 4
D) 2, 2
E) 6, 0

C

126

The central atom in a certain molecule has 1 nonbonded electron pairs and 2 bonded electron pairs in its valence shell. The molecular geometry of this molecule is ________.
A) tetrahedral
B) bent
C) seesaw
D) trigonal bipyrimidal
E) trigonal pyramidal

B

127

The central atom in a certain molecule has 4 nonbonded electron pairs and 2 bonded electron pairs in its valence shell. The molecular geometry of this molecule is ________.
A) seesaw
B) square planar
C) linear
D) trigonal bipyramidal
E) T-shaped

B

128

The central atom in the O3 molecule has ________ nonbonded electron pair(s) and ________ bonded electron pair(s) in its valence shell.
A) 6, 2
B) 1, 3
C) 2, 2
D) 3, 1
E) 3, 2

B

129

According to VSEPR theory, if there are three electron domains in the valence shell of an atom, they will be arranged in a(n) ________ geometry.
A) tetrahedral
B) octahedral
C) linear
D) square planar
E) trigonal planar

E

130

The electron-domain geometry and molecular geometry of iodine trichloride are ________ and ________, respectively.
A) trigonal bipyramidal, trigonal planar
B) tetrahedral, trigonal pyramidal
C) trigonal bipyramidal, T-shaped
D) octahedral, trigonal planar
E) T-shaped, trigonal planar

C

131

The electron-domain geometry and molecular geometry of the nitrite ion are ________ and ________, respectively.
A) trigonal bipyramidal, trigonal planar
B) tetrahedral, trigonal pyramidal
C) trigonal bipyramidal,T-shaped
D) trigonal planar, bent
E) T-shaped, trigonal planar

D

132

Using the VSEPR model, the electron-domain geometry of the central atom in O3 is ________.
A) linear
B) trigonal planar
C) tetrahedral
D) trigonal bipyramidal
E) octahedral

B

133

Using the VSEPR model, the electron-domain geometry of the central atom in ClO3- is ________.
A) linear
B) trigonal planar
C) tetrahedral
D) trigonal bipyramidal
E) octahedral

C

134

Using the VSEPR model, the electron-domain geometry of the central atom in ClF3 is ________.
A) linear
B) trigonal planar
C) tetrahedral
D) trigonal bipyramidal
E) octahedral

D

135

Using the VSEPR model, the electron-domain geometry of the central atom in XeF4 is ________.
A) linear
B) trigonal planar
C) tetrahedral
D) trigonal bipyramidal
E) octahedral

E

136

Using the VSEPR model, the molecular geometry of the central atom in KrF2 is ________.
A) linear
B) trigonal planar
C) tetrahedral
D) bent
E) trigonal pyramidal

A

137

Using the VSEPR model, the molecular geometry of the central atom in SO3 is ________.
A) linear
B) trigonal planar
C) tetrahedral
D) bent
E) trigonal pyramidal

B

138

Using the VSEPR model, the molecular geometry of the central atom in CH4 is ________.
A) linear
B) trigonal planar
C) tetrahedral
D) bent
E) trigonal pyramidal

C

139

Using the VSEPR model, the molecular geometry of the central atom in ClO2- is ________.
A) linear
B) trigonal planar
C) tetrahedral
D) bent
E) trigonal pyramidal

D

140

Using the VSEPR model, the molecular geometry of the central atom in PCl3 is ________.
A) linear
B) trigonal planar
C) tetrahedral
D) bent
E) trigonal pyramidal

E

141

Using the VSEPR model, the molecular geometry of the central atom in IF5 is ________.
A) tetrahedral
B) square planar
C) square pyramidal
D) seesaw
E) trigonal bipyramidal

C

142

The bond angles in a tetrahedral molecule are ________ degrees.
A) 109.5
B) 120
C) 90
D) 45
E) <45

A

143

Of the molecules below, only ________ is polar.
A) CO2
B) CH4
C) PF5
D) SnF3
E) H2

D

144

Which of the following molecules would be considered nonpolar?
A) PF3
B) Br2S
C) BeH2
D) TeCl2
E) HCl

C

145

The molecular geometry of the BeCl2 molecule is ________, and this molecule is ________.
A) bent, nonpolar
B) linear, polar
C) bent, polar
D) seesaw, polar
E) linear, nonpolar

E

146

The molecular geometry of the IF5 molecule is ________, and this molecule is ________.
A) trigonal bipyramidal, polar
B) trigonal bipyramidal, nonpolar
C) trigonal planar, polar
D) square pyramidal, polar
E) square pyramidal, nonpolar

D

147

According to valence bond theory, which orbitals overlap in the formation of the bond in HCl?
A) 1s on H and 2p on Cl
B) 2s on H and 3p on Cl
C) 1s on H and 3s on Cl
D) 1s on H and 3p on Cl
E) 1s on H and 4p on Cl

D

148

According to valence bond theory, which orbitals overlap in the formation of the bond in Cl2?
A) 4p on Cl and 4p on Cl
B) 3p on Cl and 3p on Cl
C) sp on Cl and sp on Cl
D) 3s on Cl and 3s on Cl
E) 2p on Cl and 2p on Cl

B

149

According to valence bond theory, which orbitals overlap in the formation of the bond in ?
A) 3s
B) 3p
C) 4s
D) 4p
E) 3d

D

150

The hybrid orbital set used by the central atom in SO3 is ________.
A) sp
B) sp2
C) sp3
D) sp3d
E) sp3d2

B

151

The hybrid orbital set used by the central atom in ClO2- is ________.
A) sp
B) sp2
C) sp3
D) sp3d
E) sp3d2

C

152

The hybrid orbital set used by the central atom in PCl5 is ________.
A) sp
B) sp2
C) sp3
D) sp3d
E) sp3d2

D

153

The electron-domain geometry of a boron-centered compound BH3 is trigonal planar. The hybridization of the central boron atom is ________.
A) sp2
B) sp3d2
C) sp3
D) sp3d
E) sp

A

154

Of the following, only ________ has sp2 hybridization of the central atom.
A) NF3
B) HCN
C) BF3
D) ICl3
E) CH4

C

155

How many unhybridized p atomic orbital(s) are found in an sp-hybridized carbon atom?
A) 4
B) 2
C) 0
D) 1
E) 3

B

156

How many hybridized s atomic orbital(s) are found in an sp2-hybridized carbon atom?
A) 0
B) 3
C) 2
D) 1
E) 4

D

157

How many hybrid orbitals are formed upon the mixing of three atomic orbitals?
A) three
B) six
C) four
D) one
E) five

A

158

Mixing one s atomic orbital and one p atomic orbital gives rise to ________.
A) three sp2 hybrid orbitals
B) two sp2 hybrid orbitals
C) two sp3 hybrid orbitals
D) three sp hybrid orbitals
E) two sp hybrid orbitals

E

159

A typical triple bond consists of ________ sigma bond(s) and ________ pi bond(s).
A) 1, 2
B) 2, 2
C) 1, 3
D) 0, 3
E) 1, 4

A

160

Construct a molecular orbital diagram for a Li2 molecule. According to molecular orbital theory, the σ1s orbital is ________ and the σ1s* orbital is ________.
A) filled, filled
B) half-filled, filled
C) empty, filled
D) filled, empty
E) filled, half-filled

A

161

Based on molecular orbital theory, the bond order of the N—N bond in the N2 molecule is ________.
A) 0
B) 1/2
C) 3
D) 2
E) 1

C

162

According to molecular orbital theory, the bond order in a Be2 molecule is ________.
A) 3
B) 1/2
C) 1
D) 2
E) 0

E

163

In molecular orbital theory, the bond order of the He—He bond in He2 is ________.
A) 0
B) 2
C) He—He
D) 1
E) 1/2

C

164

The highest energy occupied molecular orbital in the F—F bond of the F2 molecule is ________.
A) π*2s
B) π2s
C) σ*1p
D) π*2p
E) π2p

D

165

The highest energy occupied molecular orbital in the C—C bond of the C2 molecule is ________.
A) σ2p
B) σ*1p
C) π2p
D) π2s
E) π*2p

C

166

What is the molecular geometry of ICl5?

trigonal bipyramidal

167

In the valence shell of an atom there are six electron domains. They will be arranged in a(n) ________ geometry.

octahedral

168

What are the three bond angles in the trigonal bipyramidal structure?

90°, 120°, 180°

169

Three molecules have similar electron domains, but different molecular shapes. Why?

different numbers of non-bonding domains

170

The ________ hydrogen orbital overlaps with the ________ bromide orbital in HBr.

1s, 4p

171

A covalent bond in which overlap regions lie above and below an internuclear axis is called a(n) ________.

π bond

172

The ________ hydrogen orbital overlaps with the ________ fluoride orbital in HF.

1s, 2p

173

According to molecular orbital theory, the greater the ________ ,the shorter the bond length.

bond order

174

According to the Pauli exclusion principle, no more than ________ electrons with their spins paired can occupy a molecular orbital.

2

175

A ________ compound would display unpaired electrons in the molecular orbital diagram.

paramagnetic

176

Possible shapes of AB3 molecules are linear, trigonal planar, and T-shaped.

false

177

Boron trifluoride has three bonding domains, and its electron domain geometry is trigonal planar.

true

178

Electron domains for single bonds exert greater force on adjacent domains than the electron domains for multiple bonds.

false

179

The quantitative amount of charge separation in a diatomic molecule contributes to the dipole moment of that molecule.

true

180

XeF4 is a polar molecule.

false

181

Hybridization is the process of mixing atomic orbitals as atoms approach each other to form a bond.

true

182

Electrons in core orbitals contribute to atom bonding.

false

183

Nitrogen is colorless because the minimum energy to excite an electron is in the ultraviolet section of the spectrum.

true