Question 1

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

Question 2

What is the hybridization of phosphorus in PCl3?

Accepted Answer

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

Question 3

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° 
A)  90° 
B)  106° 
C)  109.5° 
D)  112° 
E)  120°

Question 4

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)  H2O 
A)  AlCl4- 
B)  NH3 
C)  PCl5 
D)  CO2 
E)  H2O

Question 5

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)  seesaw 
A)  tetrahedral 
B)  square pyramidal 
C)  square planar 
D)  octahedral 
E)  seesaw

Question 6

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

Question 7

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

Accepted Answer

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

Question 8

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

Accepted Answer

Question 9

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

Question 10

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. 
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.

Question 11

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

Question 12

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)  4 
A)  1 
B)  2 
C)  3 
D)  0 
E)  4

Question 13

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

Accepted Answer

A)  XeF4 
B)  BF3 
C)  AsF5 
D)  CF4 
E)  NH3 
A)  XeF4 
B)  BF3 
C)  AsF5 
D)  CF4 
E)  NH3

Question 14

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 15

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. 
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.

Question 16

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)  1.5 
A)  5.5 
B)  5 
C)  4 
D)  2.5 
E)  1.5

Question 17

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°. 
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°.

Question 18

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; sp3 
A)  BeCl2; sp2 
B)  SiH4; sp3 
C)  BF3; sp2  
D)  C2H2; sp 
E)  H2O; sp3

Question 19

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. 
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.

Question 20

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

Accepted Answer

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

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

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

What is the hybridization of phosphorus in PCl3?

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?

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.)

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.

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

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

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

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

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

Predict the molecular geometry and polarity of the CS2 molecule.

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

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

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.

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

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

Which is true concerning the molecular geometry of SF6?

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

Which statement is not true of molecular orbitals?

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

Chemistry: the Central Science

Atoms, Molecules, and Ions

Stoichiometry: Ratios of Combination

Reactions in Aqueous Solutions

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Electron Configuration and the Periodic Table

Chemical Bonding I: Basic Concepts

Gases

Intermolecular Forces and the Physical Properties of Liquids and Solids

Modern Materials

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy, Free Energy, and Equilibrium

Electrochemistry

Nuclear Chemistry

Environmental Chemistry

Coordination Chemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Organic Chemistry

Filters

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

What is the hybridization of phosphorus in PCl₃?

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?

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.

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

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

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

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

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

Predict the molecular geometry and polarity of the CS₂ molecule.

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

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.

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

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

Which is true concerning the molecular geometry of SF₆?

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