Question 1

In molecular orbital theory the acronym LUMO stands for

Accepted Answer

A)  lowest unhybridized molecular orientation.
B)  lowest unoccupied molecular orbital.
C)  lowest unhybridized molecular orbital.
D)  linear-uninteresting molecular orientation.
E)  It has no meaning.F) A) and D)
G) B) and E)

Question 2

Determine the electron geometry (eg) and molecular geometry (mg) of the underlined carbon in CH3CN.

Accepted Answer

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 planarF) A) and B)
G) None of the above

Question 3

Using the VSEPR model,the molecular geometry of the central atom in XeCl4   is ________.

Accepted Answer

A)  tetrahedral
B)  seasaw
C)  trigonal bipyramidal
D)  square pyramidal
E)  square planarF) C) and E)
G) A) and B)

Question 4

Determine the molecular geometry about each interior atom in the following structure.Sketch the three-dimensional structure and label the interior atoms with the corresponding molecular geometry.
CH2CHCCCH3

Accepted Answer

The sketch should show all of the approp...

Question 5

Explain why oil and water do not mix.

Accepted Answer

Water molecules are ...

Question 6

Draw the Lewis structure for CCl4.What is the hybridization on the C atom?

Accepted Answer

A)  sp
B)  sp3d2
C)  sp3d
D)  sp3
E)  sp2F) A) and B)
G) None of the above

Question 7

Identify the number of electron groups around a molecule with sp2 hybridization.

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  5F) B) and D)
G) B) and C)

Question 8

Determine the electron geometry (eg) and molecular geometry (mg) of the underlined atom CH3OCH3.

Accepted Answer

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 planarF) A) and E)
G) D) and E)

Question 9

Determine the molecular geometry for the molecule SBr2.

Accepted Answer

A)  Trigonal pyramidal
B)  Trigonal planar
C)  Tetrahedral
D)  T-shaped
E)  BentF) A) and B)
G) B) and E)

Question 10

Place the following in order of decreasing dipole moment. 
I.cis-CHCl=CHCl  \quad II.trans-CHCl=CHCI  \quad III.cis-CHF=CHF

Accepted Answer

A)  III > I > II
B)  II > I > III
C)  I > III > II
D)  II > III > I
E)  I = III > II F) A) and B)
G) C) and D)

Question 11

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

Accepted Answer

A)  less than 109.5°
B)  109.5°
C)  120°
D)  greater than 120°E) None of the above
F) B) and C)

Question 12

Place the following in order of increasing F-A-F bond angle,where A represents the central atom in each molecule. 
PF3 \quad OF2  \quad PF4+

Accepted Answer

A)  PF3 2 4+
B)  OF2 3 4+
C)  OF2 4+ 3
D)  PF4+ 2 3
E)  PF4+ 3 2 F) C) and E)
G) B) and E)

Question 13

Determine the electron geometry (eg) and molecular geometry (mg) of the underlined atom CH3OCH3.

Accepted Answer

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 planarF) A) and D)
G) B) and D)

Question 14

A molecule or ion with eight electrons in bonding orbitals and two electrons in an antibonding orbital has a bond order of:

Accepted Answer

A)  1
B)  1.5
C)  2
D)  2.5
E)  3F) A) and E)
G) None of the above

Question 15

Determine the electron geometry (eg) and molecular geometry (mg) of SiF4.

Accepted Answer

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 = tetrahedralF) A) and E)
G) All of the above

Question 16

What are the F-Po-F bond angles in PoF6 ?

Accepted Answer

A)  60°
B)  90°
C)  109.5°
D)  120°E) C) and D)
F) All of the above

Question 17

Draw the Lewis structure for COCl2.What is the hybridization on the C atom?

Accepted Answer

A)  sp
B)  sp3d2
C)  sp3d
D)  sp3
E)  sp2F) A) and C)
G) A) and E)

Question 18

Give the approximate bond angle for a molecule with octahedral electron geometry and square planar molecular geometry.

Accepted Answer

A)  90°
B)  180°
C)  >120°
D)  
E)  <120°F) C) and D)
G) A) and D)

Question 19

Using the VSEPR model,the molecular geometry of the central atom in SeO2 is ________.

Accepted Answer

A)  linear
B)  tetrahedral
C)  bent
D)  trigonal planar
E)  trigonal pyramidalF) B) and D)
G) C) and D)

Question 20

Place the following in order of increasing dipole moment. 
I.BCl3  \quad II.BIF2   \quad III.BClF2

Accepted Answer

A)  I 
B)  II 
C)  I 
D)  II 
E)  I < III < II F) B) and E)
G) B) and D)

Exam 10: Chemical Bonding II: Molecular Shapes, valence Bond Theory, and Molecular Orbital Theory

In molecular orbital theory the acronym LUMO stands for

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Place the following in order of decreasing dipole moment. I.cis-CHCl=CHCl \quad II.trans-CHCl=CHCI \quad III.cis-CHF=CHF

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Determine the molecular geometry for the molecule SBr2.

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Give the approximate bond angle for a molecule with octahedral electron geometry and square planar molecular geometry.

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Draw the Lewis structure for COCl2.What is the hybridization on the C atom?

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Explain why oil and water do not mix.

Correct AnswerverifiedWater molecules are ...View AnswerShow Answer

Determine the molecular geometry about each interior atom in the following structure.Sketch the three-dimensional structure and label the interior atoms with the corresponding molecular geometry. CH2CHCCCH3

Correct AnswerverifiedThe sketch should show all of the approp...View AnswerShow Answer

Determine the electron geometry (eg) and molecular geometry (mg) of SiF4.

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Identify the number of electron groups around a molecule with sp2 hybridization.

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Determine the electron geometry (eg) and molecular geometry (mg) of the underlined atom CH3OCH3.

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Determine the electron geometry (eg) and molecular geometry (mg) of the underlined carbon in CH3CN.

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Using the VSEPR model,the molecular geometry of the central atom in SeO2 is ________.

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Using the VSEPR model,the molecular geometry of the central atom in XeCl4 is ________.

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What are the F-Po-F bond angles in PoF6 ?

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Draw the Lewis structure for CCl4.What is the hybridization on the C atom?

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Place the following in order of increasing F-A-F bond angle,where A represents the central atom in each molecule. PF3 \quad OF2 \quad PF4+

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Determine the electron geometry (eg) and molecular geometry (mg) of the underlined atom CH3OCH3.

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Place the following in order of increasing dipole moment. I.BCl3 \quad II.BIF2 \quad III.BClF2

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A molecule or ion with eight electrons in bonding orbitals and two electrons in an antibonding orbital has a bond order of:

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

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Place the following in order of decreasing dipole moment. I.cis-CHCl=CHCl $\quad$ II.trans-CHCl=CHCI $\quad$ III.cis-CHF=CHF

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Determine the molecular geometry for the molecule SBr₂.

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Draw the Lewis structure for COCl₂.What is the hybridization on the C atom?

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Water molecules are ...
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Determine the molecular geometry about each interior atom in the following structure.Sketch the three-dimensional structure and label the interior atoms with the corresponding molecular geometry. CH₂CHCCCH₃

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The sketch should show all of the approp...
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Determine the electron geometry (eg) and molecular geometry (mg) of SiF₄.

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Identify the number of electron groups around a molecule with sp² hybridization.

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Determine the electron geometry (eg) and molecular geometry (mg) of the underlined atom CH₃OCH₃.

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Determine the electron geometry (eg) and molecular geometry (mg) of the underlined carbon in CH₃CN.

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Using the VSEPR model,the molecular geometry of the central atom in SeO₂is ________.

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Using the VSEPR model,the molecular geometry of the central atom in XeCl₄ is ________.

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What are the F-Po-F bond angles in PoF₆ ?

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Draw the Lewis structure for CCl₄.What is the hybridization on the C atom?

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Place the following in order of increasing F-A-F bond angle,where A represents the central atom in each molecule. PF₃ $\quad$ OF₂ $\quad$ PF₄⁺

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Determine the electron geometry (eg) and molecular geometry (mg) of the underlined atom CH₃OCH₃.

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Place the following in order of increasing dipole moment. I.BCl₃ $\quad$ II.BIF₂ $\quad$ III.BClF₂

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What is the O-B-O bond angle in BO₃^3-?

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