Question 1

The electrons in the delocalized π molecular orbitals of benzene (C6H6)

Accepted Answer

A)   are confined between two adjacent bonding atoms.
B)   are free to move around the six-membered ring.
C)   form the electron pairs in the C-H bonds of the compound.
D)   are unevenly distributed through the molecule.
E)   give rise to alternating single and double bonds around the ring.F) A) and D)
G) A) and E)

Question 2

Hyposulfite, SO22-, is a polyatomic ion that has not yet been definitively confirmed to exist. However, the VSEPR model may still be applied to yield a prediction on its molecular geometry. What is the most reasonable estimate for the O-S-O bond angle in hyposulfite?

Accepted Answer

A)   90°
B)   106°
C)   109.5°
D)   112°
E)   120°F) All of the above
G) C) and E)

Question 3

Predict the molecular geometry and polarity of the CS2 molecule.

Accepted Answer

A)   linear, polar
B)   linear, nonpolar
C)   tetrahedral, nonpolar
D)   bent, nonpolar
E)   bent, polarF) B) and C)
G) C) and D)

Question 4

What is the hybridization of phosphorus in PCl3?

Accepted Answer

A)   sp3
B)   sp2
C)   sp
D)   sp3d
E)   sp3d2F) A) and E)
G) All of the above

Question 5

What is the number of lone electron pairs on the central atom of a molecule having a trigonal pyramidal molecular geometry, such as NH3?

Accepted Answer

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

Question 6

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 D)
G) B) and C)

Question 7

Which is true concerning the molecular geometry of SF6?

Accepted Answer

A)   The predicted F-S-F bond angle is 60°.
B)   The predicted F-S-F bond angle is 90°.
C)   The predicted F-S-F bond angles are 90° and 120°.
D)   The predicted F-S-F bond angles are 90° and 180°.
E)   The predicted F-S-F bond angles are 60°, 120°, and 180°.F) A) and D)
G) D) and E)

Question 8

According to the VSEPR model, the molecular geometry of the carbonate ion, CO32-, is

Accepted Answer

A)   square planar.
B)   tetrahedral.
C)   pyramidal.
D)   trigonal planar.
E)   octahedral.F) B) and D)
G) A) and D)

Question 9

Which statement is not true of molecular orbitals?

Accepted Answer

A)   The number of molecular orbitals formed is always equal to the number of atomic orbitals combined.
B)   A molecular orbital can accommodate up to two electrons.
C)   When electrons are added to orbitals of the same energy, the most stable arrangement is predicted by Hund's rule.
D)   Low-energy molecular orbitals fill before high-energy molecular orbitals fill.
E)   Antibonding molecular orbitals are higher in energy than all of the bonding molecular orbitals.F) A) and E)
G) A) and D)

Question 10

Use the VSEPR model to predict the molecular geometry of H3O+ (hydronium ion).

Accepted Answer

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 E)
G) B) and D)

Question 12

According to the VSEPR model, a molecule with the general formula AB3 possessing two lone pairs on the central atom has a trigonal planar molecular geometry.

Accepted Answer

A) True 
 B)False

Question 13

What is the hybridization of As in the AsF4- ion?

Accepted Answer

A)   sp
B)   sp2
C)   sp3
D)   sp3d
E)   sp3d2F) All of the above
G) C) and E)

Question 14

What is the hybridization of the central atom in ClO3-?

Accepted Answer

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

Question 15

According to the VSEPR model, a molecule with the general formula AB4 with two lone pairs on the central atom will have a ________ molecular geometry.

Accepted Answer

A)   tetrahedral
B)   square pyramidal
C)   square planar
D)   octahedral
E)   seesawF) A) and D)
G) A) and B)

Question 16

Assume that an N2 molecule absorbs a photon and goes to its first excited state.

Accepted Answer

A)   The excited N2 is less stable than N2 in the ground state.
B)   The excited N2 is more stable than N2 in the ground state.
C)   The bond length of N2 in the excited state is shorter than the bond length of N2 in the ground state.
D)   The stability of the molecule is unchanged.E) C) and D)
F) A) and C)

Question 17

For which one of the following molecules is the indicated type of hybridization not appropriate for the central atom?

Accepted Answer

A)   BeCl2; sp2
B)   SiH4; sp3
C)   BF3; sp2 
D)   C2H2; sp
E)   H2O; sp3F) B) and E)
G) None of the above

Question 18

According to the VSEPR model, which molecule has a predicted tetrahedral molecular geometry?

Accepted Answer

A)   XeF4
B)   BF3
C)   AsF5
D)   CF4
E)   NH3F) B) and D)
G) D) and E)

Question 19

According to the VSEPR model, which one of the following molecules and ions will definitely have at least one 90° bond angle in it? (In each case, except water, the central atom is the first one in the formula.)

Accepted Answer

A)   AlCl4-
B)   NH3
C)   PCl5
D)   CO2
E)   H2OF) None of the above
G) A) and E)

Question 20

A molecule with the formula AB3 and a trigonal planar molecular geometry uses ________ to form its σ bonds.

Accepted Answer

A)   sp hybrid orbitals
B)   sp2 hybrid orbitals
C)   sp3 hybrid orbitals
D)   sp3d hybrid orbitals
E)   sp3d2 hybrid orbitalsF) B) and E)
G) None of the above

Exam 9: Chemical Bonding II: Molecular Geometry and Bonding Theories

What is the hybridization of phosphorus in PCl3?

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According to the VSEPR model, the molecular geometry of the carbonate ion, CO32-, is

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Predict the molecular geometry and polarity of the CS2 molecule.

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The electrons in the delocalized π molecular orbitals of benzene (C6H6)

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What is the number of lone electron pairs on the central atom of a molecule having a trigonal pyramidal molecular geometry, such as NH3?

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Use the VSEPR model to predict the molecular geometry of H3O+ (hydronium ion).

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Which is true concerning the molecular geometry of SF6?

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A molecule with the formula AB3 and a trigonal planar molecular geometry uses ________ to form its σ bonds.

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According to the VSEPR model, a molecule with the general formula AB4 with two lone pairs on the central atom will have a ________ molecular geometry.

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What is the hybridization of As in the AsF4- ion?

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Hyposulfite, SO22-, is a polyatomic ion that has not yet been definitively confirmed to exist. However, the VSEPR model may still be applied to yield a prediction on its molecular geometry. What is the most reasonable estimate for the O-S-O bond angle in hyposulfite?

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According to the VSEPR model, which molecule has a predicted tetrahedral molecular geometry?

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For which one of the following molecules is the indicated type of hybridization not appropriate for the central atom?

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

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According to the VSEPR model, a molecule with the general formula AB3 possessing two lone pairs on the central atom has a trigonal planar molecular geometry.

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What is the hybridization of the central atom in ClO3-?

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Which statement is not true of molecular orbitals?

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Assume that an N2 molecule absorbs a photon and goes to its first excited state.

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According to the VSEPR model, which one of the following molecules and ions will definitely have at least one 90° bond angle in it? (In each case, except water, the central atom is the first one in the formula.)

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

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What is the hybridization of phosphorus in PCl₃?

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According to the VSEPR model, the molecular geometry of the carbonate ion, CO₃^2-, is

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Predict the molecular geometry and polarity of the CS₂ molecule.

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The electrons in the delocalized π molecular orbitals of benzene (C₆H₆)

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What is the number of lone electron pairs on the central atom of a molecule having a trigonal pyramidal molecular geometry, such as NH₃?

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Use the VSEPR model to predict the molecular geometry of H₃O⁺(hydronium ion).

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Which is true concerning the molecular geometry of SF₆?

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A molecule with the formula AB₃and a trigonal planar molecular geometry uses ________ to form its σ bonds.

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According to the VSEPR model, a molecule with the general formula AB₄ with two lone pairs on the central atom will have a ________ molecular geometry.

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What is the hybridization of As in the AsF₄^-ion?

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Hyposulfite, SO₂^2-, is a polyatomic ion that has not yet been definitively confirmed to exist. However, the VSEPR model may still be applied to yield a prediction on its molecular geometry. What is the most reasonable estimate for the O-S-O bond angle in hyposulfite?

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

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According to the VSEPR model, a molecule with the general formula AB₃ possessing two lone pairs on the central atom has a trigonal planar molecular geometry.

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What is the hybridization of the central atom in ClO₃^-?

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Assume that an N₂ molecule absorbs a photon and goes to its first excited state.

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

Correct Answer
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