Question 1

The N-N bond in HNNH consists of __________.

Accepted Answer

A) one σ bond and one π bond 
B) one σ bond and two π bonds 
C) two σ bonds and one π bond 
D) two σ bonds and two π bonds 
E) one σ bond and no π bonds 
A) one σ bond and one π bond 
B) one σ bond and two π bonds 
C) two σ bonds and one π bond 
D) two σ bonds and two π bonds 
E) one σ bond and no π bonds

Question 2

Molecular Orbital theory correctly predicts paramagnetism of oxygen gas, O2. This is because __________.

Accepted Answer

A) the bond order in O2 can be shown to be equal to 2. 
B) there are more electrons in the bonding orbitals than in the antibonding orbitals. 
C) the energy of the π2p MOs is higher than that of the σ2p MO 
D) there are two unpaired electrons in the MO electron configuration of O2 
E) the O-O bond distance is relatively short 
A) the bond order in O2 can be shown to be equal to 2. 
B) there are more electrons in the bonding orbitals than in the antibonding orbitals. 
C) the energy of the π2p MOs is higher than that of the σ2p MO 
D) there are two unpaired electrons in the MO electron configuration of O2 
E) the O-O bond distance is relatively short

Question 3

Of the following molecules, only __________ is polar.

Accepted Answer

A) BeCl2 
B) BF3 
C) CBr4 
D) SiH2Cl2 
E) Cl2 
A) BeCl2 
B) BF3 
C) CBr4 
D) SiH2Cl2 
E) Cl2

Question 4

The electron-domain geometry of __________ is tetrahedral.

Accepted Answer

A) CBr4 
B) PH3 
C) CCl2Br2 
D) XeF4 
E) all of the above except XeF4 
A) CBr4 
B) PH3 
C) CCl2Br2 
D) XeF4 
E) all of the above except XeF4

Question 5

According to valence bond theory, which orbitals overlap in the formation of the bond in N2?

Accepted Answer

A) 1s 
B) 1p 
C) 2s 
D) 2p 
E) 3s 
A) 1s 
B) 1p 
C) 2s 
D) 2p 
E) 3s

Question 6

The hybridization scheme for BeF2 is __________.

Accepted Answer

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

Question 7

In a polyatomic molecule, "localized" bonding electrons are associated with __________.

Accepted Answer

A) one particular atom 
B) two particular atoms 
C) all of the atoms in the molecule 
D) all of the π bonds in the molecule 
E) two or more σ bonds in the molecule 
A) one particular atom 
B) two particular atoms 
C) all of the atoms in the molecule 
D) all of the π bonds in the molecule 
E) two or more σ bonds in the molecule

Question 8

The molecular geometry of the CHCl3 molecule is __________.

Accepted Answer

A) bent 
B) trigonal planar 
C) trigonal pyramidal 
D) tetrahedral 
E) T-shaped 
A) bent 
B) trigonal planar 
C) trigonal pyramidal 
D) tetrahedral 
E) T-shaped

Question 9

The F-B-F bond angle in the BF2- ion is approximately __________.

Accepted Answer

A) 90° 
B) 109.5° 
C) 120° 
D) 180° 
E) 60° 
A) 90° 
B) 109.5° 
C) 120° 
D) 180° 
E) 60°

Question 10

In comparing the same two atoms bonded together, the __________ the bond order, the __________ the bond length, and the __________ the bond energy.

Accepted Answer

A) greater, shorter, greater 
B) greater, greater, greater 
C) greater, longer, greater 
D) greater, greater, smaller 
E) smaller, greater, greater 
A) greater, shorter, greater 
B) greater, greater, greater 
C) greater, longer, greater 
D) greater, greater, smaller 
E) smaller, greater, greater

Question 11

Each molecular orbital can accommodate, at most, two electrons with their spins paired. This is called the __________.

Accepted Answer

The answer of Each molecular orbital can accommodate, at most,...

Question 12

The electron-domain geometry of the AsF5 molecule is trigonal bipyramidal. The hybrid orbitals used by the As atom for bonding are __________ orbitals.

Accepted Answer

A) sp2d2 
B) sp3 
C) sp3d2 
D) sp3d 
E) sp2 
A) sp2d2 
B) sp3 
C) sp3d2 
D) sp3d 
E) sp2

Question 13

In comparing the same two atoms bonded together, the __________ the bond order, the __________ the bond length, and the __________ the bond energy.

Accepted Answer

A) greater, shorter, greater 
B) greater, greater, greater 
C) greater, longer, greater 
D) smaller, longer, smaller 
E) smaller, greater, greater 
A) greater, shorter, greater 
B) greater, greater, greater 
C) greater, longer, greater 
D) smaller, longer, smaller 
E) smaller, greater, greater

Question 14

The quantitative amount of charge separation in a diatomic molecule contributes to the dipole moment of that molecule.

Accepted Answer

A) True 
 B)False

Question 15

A molecule has the formula AB3 and the central atom is in a different plane from the surrounding three atoms. Its molecular shape is __________.

Accepted Answer

A) tetrahedral 
B) trigonal pyramidal 
C) linear 
D) T-shaped 
E) bent 
A) tetrahedral 
B) trigonal pyramidal 
C) linear 
D) T-shaped 
E) bent

Question 16

An antibonding π orbital contains a maximum of __________ electrons.

Accepted Answer

A) 1 
B) 2 
C) 4 
D) 6 
E) 8 
A) 1 
B) 2 
C) 4 
D) 6 
E) 8

Question 17

Of the molecules below, only __________ is nonpolar.

Accepted Answer

A) CO2 
B) H2O 
C) NH3 
D) HCl 
E) TeCl2 
A) CO2 
B) H2O 
C) NH3 
D) HCl 
E) TeCl2

Question 18

Using the VSEPR model, the molecular geometry of the central atom in SO2 is __________.

Accepted Answer

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

Question 19

There are __________ unhybridized p atomic orbitals in an sp2-hybridized carbon atom.

Accepted Answer

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

Question 20

There are __________ σ and __________ π bonds in the H-C≡C-H molecule.

Accepted Answer

A) 3 and 2 
B) 3 and 4 
C) 4 and 3 
D) 2 and 3 
E) 5 and 0 
A) 3 and 2 
B) 3 and 4 
C) 4 and 3 
D) 2 and 3 
E) 5 and 0

Exam 9: Molecular Geometry and Bonding Theories

The N-N bond in HNNH consists of __________.

Molecular Orbital theory correctly predicts paramagnetism of oxygen gas, O2. This is because __________.

Of the following molecules, only __________ is polar.

The electron-domain geometry of __________ is tetrahedral.

According to valence bond theory, which orbitals overlap in the formation of the bond in N2?

The hybridization scheme for BeF2 is __________.

In a polyatomic molecule, "localized" bonding electrons are associated with __________.

The molecular geometry of the CHCl3 molecule is __________.

The F-B-F bond angle in the BF2- ion is approximately __________.

In comparing the same two atoms bonded together, the __________ the bond order, the __________ the bond length, and the __________ the bond energy.

Each molecular orbital can accommodate, at most, two electrons with their spins paired. This is called the __________.

The electron-domain geometry of the AsF5 molecule is trigonal bipyramidal. The hybrid orbitals used by the As atom for bonding are __________ orbitals.

In comparing the same two atoms bonded together, the __________ the bond order, the __________ the bond length, and the __________ the bond energy.

The quantitative amount of charge separation in a diatomic molecule contributes to the dipole moment of that molecule.

A molecule has the formula AB3 and the central atom is in a different plane from the surrounding three atoms. Its molecular shape is __________.

An antibonding π orbital contains a maximum of __________ electrons.

Of the molecules below, only __________ is nonpolar.

Using the VSEPR model, the molecular geometry of the central atom in SO2 is __________.

There are __________ unhybridized p atomic orbitals in an sp2-hybridized carbon atom.

There are __________ σ and __________ π bonds in the H-C≡C-H molecule.

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Stoichiometry: Calculations With Chemical Formulas and Equations

Aqueous Reactions and Solution Stoichiometry

Thermochemistry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Gases

Liquids and Intermolecular Forces

Solids and Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Aqueous Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Transition Metals and Coordination Chemistry

The Chemistry of Life: Organic and Biological Chemistry

Filters

Molecular Orbital theory correctly predicts paramagnetism of oxygen gas, O₂. This is because __________.

According to valence bond theory, which orbitals overlap in the formation of the bond in N₂?

The hybridization scheme for BeF₂ is __________.

The molecular geometry of the CHCl₃ molecule is __________.

The F-B-F bond angle in the BF₂^- ion is approximately __________.

In comparing the same two atoms bonded together, the the bond order, the the bond length, and the __ the bond energy.

The electron-domain geometry of the AsF₅ molecule is trigonal bipyramidal. The hybrid orbitals used by the As atom for bonding are __________ orbitals.

In comparing the same two atoms bonded together, the the bond order, the the bond length, and the __ the bond energy.

A molecule has the formula AB₃ and the central atom is in a different plane from the surrounding three atoms. Its molecular shape is __________.

Using the VSEPR model, the molecular geometry of the central atom in SO₂ is __________.

There are __________ unhybridized p atomic orbitals in an sp²-hybridized carbon atom.

There are σ and π bonds in the H-C≡C-H molecule.