Question 1

What is the hybridization of the oxygen in the H3O+ ion?

Accepted Answer

A)   sp2
B)   sp3
C)   sp3d
D)   sp
E)   sp3d2F) C) and D)
G) C) and E)

Question 2

How many of the following objects are chiral?
I.a baseball bat with no lettering
II.a plain shoe with no pattern
III.a plain spoon with no pattern
IV.Jack's bean stalk spiraling up a pole

Accepted Answer

A)   0
B)   1
C)   2
D)   3
E)   4F) A) and B)
G) B) and E)

Question 3

Which electron-pair geometry corresponds to a steric number of 3?

Accepted Answer

A)   linear
B)   trigonal planar
C)   tetrahedral
D)   trigonal bipyramidal
E)   octahedralF) C) and D)
G) B) and E)

Question 4

Predict the following three bond angles and give your rationale: N-C-C, O-C  
O, and C-O-H. These bonding patterns appear in amino acids.

Accepted Answer

N-C-C: 109^°,steric number of ce...

Question 5

What is the bond order of B2?

Accepted Answer

A)   0
B)   1
C)   2
D)   3
E)   1.5F) A) and B)
G) A) and C)

Question 6

What is the valence electron molecular orbital electron configuration of N2?

Accepted Answer

A)    (σ2s) 2(σ2s∗) 2(π2p) 4(σ2p) 2\left( \sigma _ { 2 s } \right)  ^ { 2 } \left( \sigma _ { 2 s } ^ { * } \right)  ^ { 2 } \left( \pi _ { 2 p } \right)  ^ { 4 } \left( \sigma _ { 2 p } \right)  ^ { 2 }(σ2s​) 2(σ2s∗​) 2(π2p​) 4(σ2p​) 2 
B)    (σ2s) 2(σ2s∗) 2(π2p) 6\left( \sigma _ { 2 s } \right)  ^ { 2 } \left( \sigma _ { 2 s } ^ { * } \right)  ^ { 2 } \left( \pi _ { 2 p } \right)  ^ { 6 }(σ2s​) 2(σ2s∗​) 2(π2p​) 6 
C)    (σ2s) 2(σ2s∗) 2(σ2p) 2(π2p) 4\left( \sigma _ { 2 s } \right)  ^ { 2 } \left( \sigma _ { 2 s } ^ { * } \right)  ^ { 2 } \left( \sigma _ { 2 p } \right)  ^ { 2 } \left( \pi _ { 2 p } \right)  ^ { 4 }(σ2s​) 2(σ2s∗​) 2(σ2p​) 2(π2p​) 4 
D)    (σ2s) 2(π2p) 4(σ2p∗) 2(π2py∗) 2\left( \sigma _ { 2 s } \right)  ^ { 2 } \left( \pi _ { 2 p } \right)  ^ { 4 } \left( \sigma _ { 2 p } ^ { * } \right)  ^ { 2 } \left( \pi _ { 2 py } ^ { * } \right)  ^ { 2 }(σ2s​) 2(π2p​) 4(σ2p∗​) 2(π2py∗​) 2 
E)    (σ2s) 2(σ2s∗) 2(π2p) 4(π2p∗) 2\left( \sigma _ { 2 s } \right)  ^ { 2 } \left( \sigma _ { 2 s } ^ { * } \right)  ^ { 2 } \left( \pi _ { 2 p } \right)  ^ { 4 } \left( \pi _ { 2 p } ^ { * } \right)  ^ { 2 }(σ2s​) 2(σ2s∗​) 2(π2p​) 4(π2p∗​) 2F) B) and C)
G) C) and D)

Question 7

Which one of the following statements regarding molecular orbitals for diatomic molecules is not correct?

Accepted Answer

A)   An atomic orbital on one atom combines with an atomic orbital on the other atom to form two molecular orbitals.
B)   2p atomic orbitals only form   π\piπ  and   π\piπ * molecular orbitals.
C)   2s atomic orbitals only form  σ\sigmaσ  and  σ\sigmaσ * atomic orbitals.
D)   ( σ\sigmaσ  orbitals are symmetric with respect to rotation around the internuclear axis;   π\piπ  orbitals do not have this symmetry.) 
E)   A bonding molecular orbital describes the build-up of negatively charged electrons between the nuclei. F) C) and D)
G) A) and B)

Question 8

Describe the valence bond picture of bonding in ethylene, which is shown below. Identify the number of valence electrons, the number of pi bonds, the number of sigma bonds, and the hybridization of the carbon atomic orbitals.

Accepted Answer

Ethylene has 12 vale...

Question 9

The members of which pair of molecules are enantiomers?

Accepted Answer

A)   I only
B)   II only
C)   III only
D)   I, II, and III
E)   II and IIIF) None of the above
G) B) and C)

Question 10

The bond angle in a trigonal planar structure is ________.

Accepted Answer

A)   90o
B)   180o
C)   109o
D)   120o
E)   105oF) C) and D)
G) A) and E)

Question 11

Determine the molecular geometry of CF2Cl2.

Accepted Answer

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

Question 12

Which one of the following molecules is paramagnetic? These molecules are described by the MO energy diagram below. These molecular orbitals are formed from the 2s and 2p atomic orbitals. 2 B)  C22- C)  N22- D)  N22+ E)  C2" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   Li2
B)   C22-
C)   N22-
D)   N22+
E)   C2F) None of the above
G) D) and E)

Question 13

Identify the polar molecule.

Accepted Answer

A)   CF4
B)   SiH4
C)   CHCl3
D)   CS2
E)   CO2F) B) and C)
G) A) and E)

Question 14

Ethanol has the formula CH3CH2OH. The oxygen atom has a ________ local molecular geometry and ________ hybridization.

Accepted Answer

A)   trigonal planar; sp
B)   tetrahedral; sp3
C)   tetrahedral; sp2
D)   seesaw; sp2
E)   bent; sp3F) A) and B)
G) C) and D)

Question 15

What is the molecular geometry of SF4?

Accepted Answer

A)   tetrahedral
B)   square pyramidal
C)   seesaw
D)   square planar
E)   T-shapedF) B) and C)
G) A) and E)

Question 16

Using the energy-level diagram below, determine the bond order of the PO molecule.

Accepted Answer

A)   2
B)   2.5
C)   1.5
D)   1
E)   0.5F) B) and E)
G) A) and E)

Question 17

What is the valence electron molecular orbital electron configuration of C2?

Accepted Answer

A)    (σ2s) 2(σ2s∗) 2(π2p) 2(π2p∗) 2\left( \sigma _ { 2 s } \right)  ^ { 2 } \left( \sigma _ { 2 s } ^ { * } \right)  ^ { 2 } \left( \pi _ { 2 p } \right)  ^ { 2 } \left( \pi _ { 2 p } ^ { * } \right)  ^ { 2 }(σ2s​) 2(σ2s∗​) 2(π2p​) 2(π2p∗​) 2 
B)    (σ2s) 2(σ2s∗) 2(π2p) 4\left( \sigma _ { 2 s } \right)  ^ { 2 } \left( \sigma _ { 2 s } ^ { * } \right)  ^ { 2 } \left( \pi _ { 2 p } \right)  ^ { 4 }(σ2s​) 2(σ2s∗​) 2(π2p​) 4 
C)    (σ2s) 2(σ2s∗) 2(σ2p) 2(π2p) 2\left( \sigma _ { 2 s } \right)  ^ { 2 } \left( \sigma _ { 2 s } ^ { * } \right)  ^ { 2 } \left( \sigma _ { 2 p } \right)  ^ { 2 } \left( \pi _ { 2 p } \right)  ^ { 2 }(σ2s​) 2(σ2s∗​) 2(σ2p​) 2(π2p​) 2 
D)    (σ2s) 2(π2p) 4(σ2p∗) 2\left( \sigma _ { 2 s } \right)  ^ { 2 } \left( \pi _ { 2 p } \right)  ^ { 4 } \left( \sigma _ { 2 p } ^ { * } \right)  ^ { 2 }(σ2s​) 2(π2p​) 4(σ2p∗​) 2 
E)    (σ2s) 2(σ2s∗) 2(π2p) 2(π2p∗) 2\left( \sigma _ { 2 s } \right)  ^ { 2 } \left( \sigma _ { 2 s } ^ { * } \right)  ^ { 2 } \left( \pi _ { 2 p } \right)  ^ { 2 } \left( \pi _ { 2 p } ^ { * } \right)  ^ { 2 }(σ2s​) 2(σ2s∗​) 2(π2p​) 2(π2p∗​) 2 . F) B) and E)
G) A) and B)

Question 18

Use energy levels of diatomic molecules derived from molecular orbital theory to predict the magnetic properties of the oxygen molecule O2 and the peroxide anion O22-.

Accepted Answer

A)   oxygen (paramagnetic) ; peroxide (paramagnetic) 
B)   oxygen (paramagnetic) ; peroxide (diamagnetic) 
C)   oxygen (diamagnetic) ; peroxide (paramagnetic) 
D)   oxygen (diamagnetic) ; peroxide (diamagnetic) 
E)   Neither have magnetic properties; only metals have magnetic properties.F) C) and E)
G) B) and E)

Question 19

Ethanol has the formula CH3CH2OH. The central carbon atom has a ________ local molecular geometry and ________ hybridization.

Accepted Answer

A)   trigonal planar; sp
B)   tetrahedral; sp3
C)   tetrahedral; sp2
D)   seesaw; sp2
E)   seesaw; sp3F) A) and E)
G) A) and B)

Question 20

Which of the following compounds has a trigonal bipyramidal shape?

Accepted Answer

A)   ICl3
B)   BrF5
C)   PCl5
D)   PH3
E)   SiF4F) B) and C)
G) A) and B)

Exam 9: Molecular Geometry: Shape Determines Function

Which one of the following statements regarding molecular orbitals for diatomic molecules is not correct?

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Use energy levels of diatomic molecules derived from molecular orbital theory to predict the magnetic properties of the oxygen molecule O2 and the peroxide anion O22-.

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What is the bond order of B2?

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Identify the polar molecule.

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Which one of the following molecules is paramagnetic? These molecules are described by the MO energy diagram below. These molecular orbitals are formed from the 2s and 2p atomic orbitals.

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What is the molecular geometry of SF4?

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How many of the following objects are chiral? I.a baseball bat with no lettering II.a plain shoe with no pattern III.a plain spoon with no pattern IV.Jack's bean stalk spiraling up a pole

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Which electron-pair geometry corresponds to a steric number of 3?

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The members of which pair of molecules are enantiomers?

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Ethanol has the formula CH3CH2OH. The central carbon atom has a ________ local molecular geometry and ________ hybridization.

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Describe the valence bond picture of bonding in ethylene, which is shown below. Identify the number of valence electrons, the number of pi bonds, the number of sigma bonds, and the hybridization of the carbon atomic orbitals.

Correct AnswerverifiedEthylene has 12 vale...View AnswerShow Answer

What is the valence electron molecular orbital electron configuration of C2?

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Ethanol has the formula CH3CH2OH. The oxygen atom has a ________ local molecular geometry and ________ hybridization.

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What is the valence electron molecular orbital electron configuration of N2?

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Using the energy-level diagram below, determine the bond order of the PO molecule.

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Determine the molecular geometry of CF2Cl2.

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Which of the following compounds has a trigonal bipyramidal shape?

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Predict the following three bond angles and give your rationale: N-C-C, O-C O, and C-O-H. These bonding patterns appear in amino acids.

Correct AnswerverifiedN-C-C: 109°, steric number of ce...View AnswerShow Answer

The bond angle in a trigonal planar structure is ________.

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What is the hybridization of the oxygen in the H3O+ ion?

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Use energy levels of diatomic molecules derived from molecular orbital theory to predict the magnetic properties of the oxygen molecule O₂ and the peroxide anion O₂²^-.

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What is the bond order of B₂?

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What is the molecular geometry of SF₄?

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Ethanol has the formula CH₃CH₂OH. The central carbon atom has a local molecular geometry and hybridization.

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Ethylene has 12 vale...
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What is the valence electron molecular orbital electron configuration of C₂?

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Ethanol has the formula CH₃CH₂OH. The oxygen atom has a local molecular geometry and hybridization.

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What is the valence electron molecular orbital electron configuration of N₂?

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Determine the molecular geometry of CF₂Cl₂.

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N-C-C: 109^°,steric number of ce...
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What is the hybridization of the oxygen in the H₃O⁺ ion?

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