Question 1

Molecular Orbital theory correctly predicts diamagnetism of fluorine gas,F2.This is because ________.

Accepted Answer

A) the bond order in F2 can be shown to be equal to 1 
B) there are more electrons in the bonding orbitals than in the antibonding orbitals 
C) all electrons in the MO electron configuration of F2 are paired 
D) the energy of the π2pMOs is higher than that of the σ2p MO 
E) the F-F bond enthalpy is very low 
A) the bond order in F2 can be shown to be equal to 1 
B) there are more electrons in the bonding orbitals than in the antibonding orbitals 
C) all electrons in the MO electron configuration of F2 are paired 
D) the energy of the π2pMOs is higher than that of the σ2p MO 
E) the F-F bond enthalpy is very low

Question 2

For a molecule with the formula AB3,the molecular shape is ________.

Accepted Answer

A) linear, octahedral, or bent 
B) linear, bent, or trigonal planar 
C) linear, bent, or T-shaped 
D) tetrahedral 
E) trigonal planar, trigonal pyramidal, or T-shaped 
A) linear, octahedral, or bent 
B) linear, bent, or trigonal planar 
C) linear, bent, or T-shaped 
D) tetrahedral 
E) trigonal planar, trigonal pyramidal, or T-shaped

Question 3

Valence bond theory addresses all of the following except ________.

Accepted Answer

A) molecular shape 
B) covalent bonding 
C) excited states of molecules 
D) hybridization 
E) multiple bonds 
A) molecular shape 
B) covalent bonding 
C) excited states of molecules 
D) hybridization 
E) multiple bonds

Question 4

When four atomic orbitals are mixed to form hybrid orbitals,how many hybrid orbitals are formed?

Accepted Answer

A) one 
B) six 
C) three 
D) four 
E) five 
A) one 
B) six 
C) three 
D) four 
E) five

Question 5

Of the following species,________ will have bond angles of 120°.

Accepted Answer

A) PH3 
B) ClF3 
C) NCl3 
D) BCl3 
E) All of these will have bond angles of 120°. 
A) PH3 
B) ClF3 
C) NCl3 
D) BCl3 
E) All of these will have bond angles of 120°.

Question 6

The hybridization of orbitals on the central atom in a molecule is sp2.The electron-domain geometry about this central atom is ________.

Accepted Answer

A) octahedral 
B) linear 
C) trigonal planar 
D) trigonal bipyramidal 
E) tetrahedral 
A) octahedral 
B) linear 
C) trigonal planar 
D) trigonal bipyramidal 
E) tetrahedral

Question 7

What is the hybridization of the carbon atom attached to the two oxygen atoms in the structure below?

Accepted Answer

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

Question 8

Of the following,the central atom is sp3d2 hybridized only in ________.

Accepted Answer

A) PCl5 
B) XeF4 
C) PH3 
D) Br3- 
E) BeF2 
A) PCl5 
B) XeF4 
C) PH3 
D) Br3- 
E) BeF2

Question 9

The highest energy occupied molecular orbital in the C-C bond of the C2 molecule is ________.

Accepted Answer

A) σ2p 
B) σ*1p 
C) π2p 
D) π2s 
E) π*2p 
A) σ2p 
B) σ*1p 
C) π2p 
D) π2s 
E) π*2p

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

In a SO42- ion,"localized" bonding electrons are associated with ________ particular atoms.

Accepted Answer

A) zero 
B) one 
C) two 
D) three 
E) four 
A) zero 
B) one 
C) two 
D) three 
E) four

Question 12

The combination of two atomic orbitals results in the formation of ________ molecular orbitals.

Accepted Answer

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

Question 13

According to molecular orbital theory,the bond order of He-He in the He2 molecule is ________.

Accepted Answer

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

Question 14

Electrons in core orbitals contribute to atom bonding.

Accepted Answer

A) True 
 B)False

Question 15

How may lone pair electrons are found on the central atom in a ClF3 molecule which has a "T-shaped" geometry?

Accepted Answer

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

Question 16

The sp3d2 atomic hybrid orbital set accommodates ________ electron domains.

Accepted Answer

A) 2 
B) 3 
C) 4 
D) 5 
E) 6 
A) 2 
B) 3 
C) 4 
D) 5 
E) 6

Question 17

Using the VSEPR model,the molecular geometry of the central atom in CH4 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 18

The molecular geometry of the BeCl2 molecule is ________,and this molecule is ________.

Accepted Answer

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

Question 19

Three molecules have similar electron domains,but different molecular shapes.Why?

Accepted Answer

different

Question 20

The molecular geometry of the IF5 molecule is ________,and this molecule is ________.

Accepted Answer

A) trigonal bipyramidal, polar 
B) trigonal bipyramidal, nonpolar 
C) trigonal planar, polar 
D) square pyramidal, polar 
E) square pyramidal, nonpolar 
A) trigonal bipyramidal, polar 
B) trigonal bipyramidal, nonpolar 
C) trigonal planar, polar 
D) square pyramidal, polar 
E) square pyramidal, nonpolar

Exam 9: Molecular Geometry and Bonding Theories

Molecular Orbital theory correctly predicts diamagnetism of fluorine gas,F2.This is because ________.

For a molecule with the formula AB3,the molecular shape is ________.

Valence bond theory addresses all of the following except ________.

When four atomic orbitals are mixed to form hybrid orbitals,how many hybrid orbitals are formed?

Of the following species,________ will have bond angles of 120°.

The hybridization of orbitals on the central atom in a molecule is sp2.The electron-domain geometry about this central atom is ________.

What is the hybridization of the carbon atom attached to the two oxygen atoms in the structure below?

Of the following,the central atom is sp3d2 hybridized only in ________.

The highest energy occupied molecular orbital in the C-C bond of the C2 molecule is ________.

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

In a SO42- ion,"localized" bonding electrons are associated with ________ particular atoms.

The combination of two atomic orbitals results in the formation of ________ molecular orbitals.

According to molecular orbital theory,the bond order of He-He in the He2 molecule is ________.

Electrons in core orbitals contribute to atom bonding.

How may lone pair electrons are found on the central atom in a ClF3 molecule which has a "T-shaped" geometry?

The sp3d2 atomic hybrid orbital set accommodates ________ electron domains.

Using the VSEPR model,the molecular geometry of the central atom in CH4 is ________.

The molecular geometry of the BeCl2 molecule is ________,and this molecule is ________.

Three molecules have similar electron domains,but different molecular shapes.Why?

The molecular geometry of the IF5 molecule is ________,and this molecule is ________.

Introduction: Matter, energy, and Measurement

Atoms, molecules, and Ions

Chemical Reactions and Reaction Stoichiometry

Reactions in Aqueous Solution

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 diamagnetism of fluorine gas,F₂.This is because ________.

For a molecule with the formula AB₃,the molecular shape is ________.

The hybridization of orbitals on the central atom in a molecule is sp².The electron-domain geometry about this central atom is ________.

Of the following,the central atom is sp³d² hybridized only in ________.

The highest energy occupied molecular orbital in the C-C bond of the C₂ molecule is ________.

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

In a SO₄^2- ion,"localized" bonding electrons are associated with ________ particular atoms.

According to molecular orbital theory,the bond order of He-He in the He₂ molecule is ________.

How may lone pair electrons are found on the central atom in a ClF₃ molecule which has a "T-shaped" geometry?

The sp³d² atomic hybrid orbital set accommodates ________ electron domains.

Using the VSEPR model,the molecular geometry of the central atom in CH₄ is ________.

The molecular geometry of the BeCl₂ molecule is ,and this molecule is .

The molecular geometry of the IF₅ molecule is ,and this molecule is .