Question 1

In one sentence, state how molecular orbitals are usually obtained.

Accepted Answer

By the linear combin...

Question 2

Which of the following statements relating to molecular orbital (MO)  theory is incorrect?

Accepted Answer

A)   Combination of two atomic orbitals produces one bonding and one antibonding MO.
B)   A bonding MO is lower in energy than the two atomic orbitals from which it is formed.
C)   Combination of two 2p orbitals may result in either  σ\sigmaσ  or   π\piπ  MOs.
D)   A species with a bond order of zero will not be stable.
E)   In a stable molecule having an even number of electrons, all electrons must be paired. F) C) and E)
G) None of the above

Question 3

Valence bond theory predicts that xenon will use _____ hybrid orbitals in XeOF4.

Accepted Answer

A)   sp
B)   sp2
C)   sp3
D)   sp3d
E)   sp3d2F) A) and E)
G) None of the above

Question 4

Sketch the shapes of the $\sigma$1s and $\sigma$1s* molecular orbitals formed by the overlap of two hydrogen 1s atomic orbitals.

Accepted Answer

Question 5

In applying molecular orbital theory, the bond order is calculated in the same way as with Lewis structures.

Accepted Answer

A) True 
 B)False

Question 6

Overlap of two sp2 hybrid orbitals produces a  $\pi$ bond.

Accepted Answer

A) True 
 B)False

Question 7

Valence bond theory predicts that tin will use _____ hybrid orbitals in SnCl3¯.

Accepted Answer

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

Question 8

The angles between sp2 hybrid orbitals are 109.5 $\degree$.

Accepted Answer

A) True 
 B)False

Question 9

Explain what is meant by the term "bond order" and describe how it can be calculated using the information in a molecular orbital energy level diagram.

Accepted Answer

The bond order in MO theory is the net n...

Question 10

In molecular orbital theory, molecules with an even number of electrons will have bond orders which are whole numbers.

Accepted Answer

A) True 
 B)False

Question 11

According to molecular orbital theory, what is the bond order in the O2+ ion?

Accepted Answer

A)   5.5
B)   5
C)   4
D)   2.5
E)   1.5F) A) and B)
G) A) and E)

Question 12

According to molecular orbital theory, all diatomic molecules with an even number of electrons will be diamagnetic.

Accepted Answer

A) True 
 B)False

Question 13

How many sigma and pi bonds, respectively, are in the molecule below? CH3CH2CHCHCH3?

Accepted Answer

A)   16, 1
B)   16, 0
C)   15, 1
D)   15, 0
E)   14, 1F) A) and D)
G) B) and E)

Question 14

According to the molecular orbital (MO)  treatment of the NO molecule, what are the bond order and the number of unpaired electrons, respectively?

Accepted Answer

A)   2, 2
B)   3, 3
C)   1, 1
D)   1.5, 2
E)   2.5, 1F) B) and C)
G) A) and E)

Question 15

According to valence bond theory, which of the following molecules involves sp2 hybridization of orbitals on the central atom?

Accepted Answer

A)   C2H2 C is the central atom
B)   C2H4, C is the central atom
C)   C2H6, C is the central atom
D)   CO2, C is the central atom
E)   H2O, O is the central atomF) B) and D)
G) A) and E)

Question 16

A molecule with the formula AX4 uses _________ to form its bonds.

Accepted Answer

A)   sp hybrid orbitals
B)   sp2 hybrid orbitals
C)   sp3 hybrid orbitals
D)   sp3d hybrid orbitals
E)   sp3d2 hybrid orbitalsF) D) and E)
G) A) and C)

Question 17

According to valence bond theory, the triple bond in ethyne (acetylene, C2H2)  consists of

Accepted Answer

A)   three  σ\sigmaσ  bonds and no   π\piπ  bonds.
B)   two  σ\sigmaσ bonds and one   π\piπ  bond.
C)   one  σ\sigmaσ  bond and two   π\piπ  bonds.
D)   no σ\sigmaσ  bonds and three   π\piπ  bonds.
E)   None of these choices is correct. F) B) and C)
G) A) and C)

Question 18

Explain what is meant by a node (or nodal plane) in a molecular orbital and draw sketches of the following orbitals, indicating at least one nodal plane in each one.
A) a $\sigma$* orbital
B) a  $\pi$* orbital

Accepted Answer

A nodal plane is a p...

Question 19

In molecular orbital theory, combination of two 2p atomic orbitals may give rise to either $\sigma$ or $\pi$ type molecular orbitals.

Accepted Answer

A) True 
 B)False

Question 20

Valence bond theory predicts that sulfur will use _____ hybrid orbitals in sulfur dioxide, SO2.

Accepted Answer

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

Exam 11: Theories of Covalent Bonding

According to valence bond theory, which of the following molecules involves sp2 hybridization of orbitals on the central atom?

Correct AnswerverifiedShow Answer

In applying molecular orbital theory, the bond order is calculated in the same way as with Lewis structures.

Correct AnswerverifiedShow Answer

Valence bond theory predicts that tin will use _____ hybrid orbitals in SnCl3¯.

Correct AnswerverifiedShow Answer

How many sigma and pi bonds, respectively, are in the molecule below? CH3CH2CHCHCH3?

Correct AnswerverifiedShow Answer

According to valence bond theory, the triple bond in ethyne (acetylene, C2H2) consists of

Correct AnswerverifiedShow Answer

A molecule with the formula AX4 uses _________ to form its bonds.

Correct AnswerverifiedShow Answer

Which of the following statements relating to molecular orbital (MO) theory is incorrect?

Correct AnswerverifiedShow Answer

Valence bond theory predicts that sulfur will use _____ hybrid orbitals in sulfur dioxide, SO2.

Correct AnswerverifiedShow Answer

Explain what is meant by the term "bond order" and describe how it can be calculated using the information in a molecular orbital energy level diagram.

Correct AnswerverifiedThe bond order in MO theory is the net n...View AnswerShow Answer

According to the molecular orbital (MO) treatment of the NO molecule, what are the bond order and the number of unpaired electrons, respectively?

Correct AnswerverifiedShow Answer

In molecular orbital theory, molecules with an even number of electrons will have bond orders which are whole numbers.

Correct AnswerverifiedShow Answer

In molecular orbital theory, combination of two 2p atomic orbitals may give rise to either σ\sigmaσ or π\piπ type molecular orbitals.

Correct AnswerverifiedShow Answer

Overlap of two sp2 hybrid orbitals produces a π\piπ bond.

Correct AnswerverifiedShow Answer

The angles between sp2 hybrid orbitals are 109.5 °\degree° .

Correct AnswerverifiedShow Answer

According to molecular orbital theory, all diatomic molecules with an even number of electrons will be diamagnetic.

Correct AnswerverifiedShow Answer

Sketch the shapes of the σ\sigmaσ 1s and σ\sigmaσ 1s* molecular orbitals formed by the overlap of two hydrogen 1s atomic orbitals.

Correct AnswerverifiedShow Answer

Valence bond theory predicts that xenon will use _____ hybrid orbitals in XeOF4.

Correct AnswerverifiedShow Answer

According to molecular orbital theory, what is the bond order in the O2+ ion?

Correct AnswerverifiedShow Answer

Explain what is meant by a node (or nodal plane) in a molecular orbital and draw sketches of the following orbitals, indicating at least one nodal plane in each one. A) a σ\sigmaσ * orbital B) a π\piπ * orbital

Correct AnswerverifiedA nodal plane is a p...View AnswerShow Answer

In one sentence, state how molecular orbitals are usually obtained.

Correct AnswerverifiedBy the linear combin...View AnswerShow Answer

According to valence bond theory, which of the following molecules involves sp² hybridization of orbitals on the central atom?

Correct Answer
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Valence bond theory predicts that tin will use _____ hybrid orbitals in SnCl₃^¯.

Correct Answer
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How many sigma and pi bonds, respectively, are in the molecule below? CH₃CH₂CHCHCH₃?

Correct Answer
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According to valence bond theory, the triple bond in ethyne (acetylene, C₂H₂) consists of

Correct Answer
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A molecule with the formula AX₄ uses _________ to form its bonds.

Correct Answer
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Correct Answer
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Valence bond theory predicts that sulfur will use _____ hybrid orbitals in sulfur dioxide, SO₂.

Correct Answer
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Correct Answer
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The bond order in MO theory is the net n...
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Correct Answer
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Correct Answer
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In molecular orbital theory, combination of two 2p atomic orbitals may give rise to either $\sigma$ or $\pi$ type molecular orbitals.

Correct Answer
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Overlap of two sp² hybrid orbitals produces a $\pi$ bond.

Correct Answer
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The angles between sp² hybrid orbitals are 109.5 $\degree$ .

Correct Answer
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Correct Answer
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Sketch the shapes of the $\sigma$ ₁_s and $\sigma$ ₁_s* molecular orbitals formed by the overlap of two hydrogen 1s atomic orbitals.

Correct Answer
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Valence bond theory predicts that xenon will use _____ hybrid orbitals in XeOF₄.

Correct Answer
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According to molecular orbital theory, what is the bond order in the O₂⁺ ion?

Correct Answer
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Explain what is meant by a node (or nodal plane) in a molecular orbital and draw sketches of the following orbitals, indicating at least one nodal plane in each one. A) a $\sigma$ * orbital B) a $\pi$ * orbital

Correct Answer
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A nodal plane is a p...
View Answer

Correct Answer
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By the linear combin...
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