Question 1

Which compound below has the smallest dipole moment?

Accepted Answer

A) CF2Cl2 
B) CF3Cl 
C) CF4 
D) CFCl3 
E) CHFCl2 
A) CF2Cl2 
B) CF3Cl 
C) CF4 
D) CFCl3 
E) CHFCl2 C

Question 2

Which molecule below is paramagnetic?

Accepted Answer

A) F2 
B) O2 
C) C2 
D) Be2 
E) Cl 
A) F2 
B) O2 
C) C2 
D) Be2 
E) Cl B

Question 3

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 O2-2

Accepted Answer

A) oxygen, paramagnetic; peroxide, paramagnetic 
B) oxygen, paramagnetic; peroxide, diamagnetic 
C) oxygen, diamagnetic; peroxide, paramagnetic 
D) oxygen, diamagnetic; peroxide, diamagnetic 
E) Neither has magnetic properties; only metals have magnetic properties. 
A) oxygen, paramagnetic; peroxide, paramagnetic 
B) oxygen, paramagnetic; peroxide, diamagnetic 
C) oxygen, diamagnetic; peroxide, paramagnetic 
D) oxygen, diamagnetic; peroxide, diamagnetic 
E) Neither has magnetic properties; only metals have magnetic properties. B

Question 4

Determine the molecular geometry of N2O.

Accepted Answer

A) bent 
B) trigonal planar 
C) linear 
D) tetrahedral 
E) trigonal pyramidal 
A) bent 
B) trigonal planar 
C) linear 
D) tetrahedral 
E) trigonal pyramidal

Question 5

Which bond angle is the largest?

Accepted Answer

A) O - C - S in COS 
B) H - Si - H in SiH4 
C) O - C - O in CO 2-   
D) Cl - C - Cl in COCl2 
E) F - S - F in SF6 
A) O - C - S in COS 
B) H - Si - H in SiH4 
C) O - C - O in CO 2-   
D) Cl - C - Cl in COCl2 
E) F - S - F in SF6

Question 6

What is the hybridization of sulfur in SOCl2?

Accepted Answer

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

Question 7

What is the hybridization of Cl in ClF3, and what is the molecular geometry?

Accepted Answer

A) sp3d, trigonal pyramidal 
B) sp3d, T-shaped 
C) sp3d, trigonal planar 
D) sp3d2, square planar 
E) sp3d2, octahedral 
A) sp3d, trigonal pyramidal 
B) sp3d, T-shaped 
C) sp3d, trigonal planar 
D) sp3d2, square planar 
E) sp3d2, octahedral

Question 8

What is the hybridization of the arsenic atom in AsCl5?

Accepted Answer

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

Question 9

Which statement below regarding valence bond theory is TRUE?

Accepted Answer

A) Hybrid orbitals cannot contain lone pairs of electrons. 
B) A single bond is a sigma bond with a localized electron pair. 
C) A double bond can be described as two  $\pi$bonds occupied by four electrons. 
D) The magnetic properties of a molecule are readily explained. 
E) There is no provision for atoms with expanded octets. 
A) Hybrid orbitals cannot contain lone pairs of electrons. 
B) A single bond is a sigma bond with a localized electron pair. 
C) A double bond can be described as two  $\pi$bonds occupied by four electrons. 
D) The magnetic properties of a molecule are readily explained. 
E) There is no provision for atoms with expanded octets.

Question 10

You synthesize a compound by combining one volume of iodine vapor with seven volumes of fluorine gas.What is the steric number of the iodine atom?

Accepted Answer

A) 3 
B) 4 
C) 6 
D) 7 
E) 8 
A) 3 
B) 4 
C) 6 
D) 7 
E) 8

Question 11

What does a Lewis structure NOT show?

Accepted Answer

A) the bonding arrangement of atoms 
B) three-dimensional molecular shape 
C) bonding electrons 
D) nonbonding electrons 
E) charges (when applicable) 
A) the bonding arrangement of atoms 
B) three-dimensional molecular shape 
C) bonding electrons 
D) nonbonding electrons 
E) charges (when applicable)

Question 12

Which compound below is the most polar?

Accepted Answer

A) NH3 
B) PH3 
C) AsH3 
D) SbH3 
E) BiH3 
A) NH3 
B) PH3 
C) AsH3 
D) SbH3 
E) BiH3

Question 13

Which statement concerning benzene is NOT correct?

Accepted Answer

A) The electrons in the double bonds are delocalized over the entire carbon ring. 
B) All the  $\pi$ bonds originate from p atomic orbitals. 
C) Benzene does not have a dipole moment. 
D) The carbon atomic orbitals are sp2 hybridized. 
E) Benzene has both long and short carbon-carbon bonds. 
A) The electrons in the double bonds are delocalized over the entire carbon ring. 
B) All the  $\pi$ bonds originate from p atomic orbitals. 
C) Benzene does not have a dipole moment. 
D) The carbon atomic orbitals are sp2 hybridized. 
E) Benzene has both long and short carbon-carbon bonds.

Question 14

Which statement regarding hybrid orbitals and molecular shape is FALSE?

Accepted Answer

A) Atomic orbitals form hybrid orbitals with regions of electron density at specific angles around the nucleus. 
B) Hybrid orbitals are mathematical combinations of the wave functions of atomic orbitals. 
C) Hybrid orbitals generally have electron density at angles that minimize electron repulsions and maximize orbital overlap when bonding occurs. 
D) Hybridization can involve atomic orbitals that are occupied or unoccupied by electrons. 
E) Atomic orbitals on different atoms mix to form hybrid orbitals at angles that minimize repulsions. 
A) Atomic orbitals form hybrid orbitals with regions of electron density at specific angles around the nucleus. 
B) Hybrid orbitals are mathematical combinations of the wave functions of atomic orbitals. 
C) Hybrid orbitals generally have electron density at angles that minimize electron repulsions and maximize orbital overlap when bonding occurs. 
D) Hybridization can involve atomic orbitals that are occupied or unoccupied by electrons. 
E) Atomic orbitals on different atoms mix to form hybrid orbitals at angles that minimize repulsions.

Question 15

Which molecule below has a central atom that is sp3 hybridized?

Accepted Answer

A) C2H2 
B) H2CO 
C) H2S 
D) C2H4 
E) C2H2Cl2 
A) C2H2 
B) H2CO 
C) H2S 
D) C2H4 
E) C2H2Cl2

Question 16

The amide functional group is the fundamental linking unit in proteins.Two partial Lewis structures for formamide are shown below.These structures do not show the lone pair electrons or the formal charges.Experiment shows that formamide is planar, so which is the better representation of the electronic structure, I or II? Is this conclusion consistent with the formal charges on the atoms? Explain the rationale for your answers.

Accepted Answer

Structure II predicts a planar structure

Question 17

Which statement below is NOT correct about CO, CO+, and CO-? Use the following MO diagram.

Accepted Answer

A) All have at least six electrons in bonding MOs. 
B) CO has the shortest bond. 
C) All have a permanent dipole. 
D) CO is paramagnetic. 
E) Two of these have the same bond order. 
A) All have at least six electrons in bonding MOs. 
B) CO has the shortest bond. 
C) All have a permanent dipole. 
D) CO is paramagnetic. 
E) Two of these have the same bond order.

Question 18

What is the molecular geometry of SF4O?

Accepted Answer

A) pentagonal 
B) tetrahedral 
C) trigonal bipyramidal 
D) trigonal planar 
E) square pyramidal 
A) pentagonal 
B) tetrahedral 
C) trigonal bipyramidal 
D) trigonal planar 
E) square pyramidal

Question 19

Which type of molecular orbital has maximum electron density above and below the internuclear axis but zero density in a plane perpendicular to the internuclear axis?

Accepted Answer

A) ($\sigma$) 
B) ( $\pi$) 
C) ($\sigma$*) 
D) ( $\pi$*) 
E) P 
A) ($\sigma$) 
B) ( $\pi$) 
C) ($\sigma$*) 
D) ( $\pi$*) 
E) P

Question 20

The electron group geometry of AsH3 is _______, and its molecular geometry is _______

Accepted Answer

A) trigonal planar; trigonal planar. 
B) tetrahedral; trigonal planar. 
C) tetrahedral; tetrahedral. 
D) tetrahedral; trigonal pyramidal. 
E) trigonal pyramidal; trigonal pyramidal. 
A) trigonal planar; trigonal planar. 
B) tetrahedral; trigonal planar. 
C) tetrahedral; tetrahedral. 
D) tetrahedral; trigonal pyramidal. 
E) trigonal pyramidal; trigonal pyramidal.

Exam 5: Bonding Theories Explaining Molecular Geometry

Which compound below has the smallest dipole moment?

Which molecule below is paramagnetic?

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 O2-2

Determine the molecular geometry of N2O.

Which bond angle is the largest?

What is the hybridization of sulfur in SOCl2?

What is the hybridization of Cl in ClF3, and what is the molecular geometry?

What is the hybridization of the arsenic atom in AsCl5?

Which statement below regarding valence bond theory is TRUE?

You synthesize a compound by combining one volume of iodine vapor with seven volumes of fluorine gas.What is the steric number of the iodine atom?

What does a Lewis structure NOT show?

Which compound below is the most polar?

Which statement concerning benzene is NOT correct?

Which statement regarding hybrid orbitals and molecular shape is FALSE?

Which molecule below has a central atom that is sp3 hybridized?

Which statement below is NOT correct about CO, CO+, and CO-? Use the following MO diagram.

What is the molecular geometry of SF4O?

Which type of molecular orbital has maximum electron density above and below the internuclear axis but zero density in a plane perpendicular to the internuclear axis?

The electron group geometry of AsH3 is _______, and its molecular geometry is _______

Matter and Energy an Atomic Perspective

Atoms, Ions, and Molecules the Building Blocks of Matter

Atomic Structure Explaining the Properties of Elements

Chemical Bonding Understanding Climate Change

Intermolecular Forces Attractions Between Particles

Stoichiometry Mass Relationships and Chemical Reactions

Aqueous Solutions Chemistry of the Hydrosphere

Thermochemistry Energy Changes in Chemical Reactions

Properties of Gases the Air We Breathe

Properties of Solutions Their Concentrations and Colligative Properties

Thermodynamics Why Chemical Reactions Happen

Chemical Kinetics Clearing the Air

Chemical Equilibrium Equal but Opposite Reaction Rates

Acid-Base Equilibria Proton Transfer in Biological Systems

Additional Aqueous Equilibria Chemistry and the Oceans

Electrochemistry the Quest for Clean Energy

The Solid State a Particulate View

Organic Chemistry Fuels, Pharmaceuticals, and Modern Materials

Biochemistry the Compounds of Life

Nuclear Chemistry the Risks and Benefits

The Main Group Elements Life and the Periodic Table

Transition Metals Biological and Medical Applications

Filters

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 O₂^-2

Determine the molecular geometry of N₂O.

What is the hybridization of sulfur in SOCl₂?

What is the hybridization of Cl in ClF₃, and what is the molecular geometry?

What is the hybridization of the arsenic atom in AsCl₅?

Which molecule below has a central atom that is sp³ hybridized?

Which statement below is NOT correct about CO, CO⁺, and CO^-? Use the following MO diagram.

What is the molecular geometry of SF₄O?

The electron group geometry of AsH₃ is _, and its molecular geometry is _