Question 1

Overlap of two sp2 hybrid orbitals produces a F1F1F1S1F1F1F10 bond.

Accepted Answer

A) True 
 B)False

Question 2

According to valence bond theory, the triple bond in ethyne (acetylene, C2H2) consists of

Accepted Answer

A)  three F1F1F1S1F1F1F10 bonds and no F1F1F1S1F1F1F10 bonds. 
B)  two F1F1F1S1F1F1F10 bonds and one F1F1F1S1F1F1F10 bond. 
C)  one F1F1F1S1F1F1F10 bond and two F1F1F1S1F1F1F10 bonds. 
D)  no F1F1F1S1F1F1F10 bonds and three F1F1F1S1F1F1F10 bonds. 
E)  none of the above. 
A)  three F1F1F1S1F1F1F10 bonds and no F1F1F1S1F1F1F10 bonds. 
B)  two F1F1F1S1F1F1F10 bonds and one F1F1F1S1F1F1F10 bond. 
C)  one F1F1F1S1F1F1F10 bond and two F1F1F1S1F1F1F10 bonds. 
D)  no F1F1F1S1F1F1F10 bonds and three F1F1F1S1F1F1F10 bonds. 
E)  none of the above.

Question 3

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 4

How many sigma and pi bonds, respectively, are in the molecule below? CH3CH2CHCHCH3?

Accepted Answer

A)  16, 1 
B)  16, 0 
C)  15, 1 
D)  15, 0 
E)  14, 1 
A)  16, 1 
B)  16, 0 
C)  15, 1 
D)  15, 0 
E)  14, 1

Question 5

According to the molecular orbital (MO) treatment of the NO molecule, what are the bond order and the number of unpaired electrons, respectively?

Accepted Answer

A)  2, 2 
B)  3, 3 
C)  1, 1 
D)  1.5, 2 
E)  2.5, 1 
A)  2, 2 
B)  3, 3 
C)  1, 1 
D)  1.5, 2 
E)  2.5, 1

Question 6

In molecular orbital theory, combination of two atomic orbitals produces two molecular orbitals.

Accepted Answer

A) True 
 B)False

Question 7

Which one of the following statements about orbital hybridization is incorrect?

Accepted Answer

A)  The carbon atom in CH4 is sp3 hybridized. 
B)  The carbon atom in CO2 is sp hybridized. 
C)  The nitrogen atom in NH3 is sp2 hybridized. 
D)  sp2 hybrid orbitals are coplanar, and at 120° to each other. 
E)  sp hybrid orbitals lie at 180° to each other. 
A)  The carbon atom in CH4 is sp3 hybridized. 
B)  The carbon atom in CO2 is sp hybridized. 
C)  The nitrogen atom in NH3 is sp2 hybridized. 
D)  sp2 hybrid orbitals are coplanar, and at 120° to each other. 
E)  sp hybrid orbitals lie at 180° to each other.

Question 8

Valence bond theory explains the bonding in diatomic molecules such as HCl without resorting to the use of hybrid orbitals.

Accepted Answer

A) True 
 B)False

Question 9

According to valence bond theory, which of the following molecules involves sp2 hybridization of orbitals on the central atom? (central atom is bold)

Accepted Answer

A)  C2H2 
B)  C2H4 
C)  C2H6 
D)  CO2 
E)  H2O 
A)  C2H2 
B)  C2H4 
C)  C2H6 
D)  CO2 
E)  H2O

Question 10

A carbon-carbon triple bond in a molecule may give rise to the existence of cis and trans isomers.

Accepted Answer

A) True 
 B)False

Question 11

A molecule with the formula AX3 uses __________ to form its 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 12

Valence bond theory predicts that iodine will use _____ hybrid orbitals in ICl2-.

Accepted Answer

A)  sp2 
B)  sp3 
C)  sp3d 
D)  sp3d 2 
E)  none of the above 
A)  sp2 
B)  sp3 
C)  sp3d 
D)  sp3d 2 
E)  none of the above

Question 13

In one sentence state the basic principle of valence bond theory.

Accepted Answer

A covalent bond forms when the

Question 14

According to molecular orbital (MO) theory, the twelve outermost electrons in the O2 molecule are distributed as follows:

Accepted Answer

A)  12 in bonding MOs, 0 in antibonding MOs. 
B)  10 in bonding MOs, 2 in antibonding MOs. 
C)  9 in bonding MOs, 3 in antibonding MOs. 
D)  8 in bonding MOs, 4 in antibonding MOs. 
E)  7 in bonding MOs, 5 in antibonding MOs. 
A)  12 in bonding MOs, 0 in antibonding MOs. 
B)  10 in bonding MOs, 2 in antibonding MOs. 
C)  9 in bonding MOs, 3 in antibonding MOs. 
D)  8 in bonding MOs, 4 in antibonding MOs. 
E)  7 in bonding MOs, 5 in antibonding MOs.

Question 15

Valence bond theory predicts that carbon will use _____ hybrid orbitals in the carbonate anion, CO32-.

Accepted Answer

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

Question 16

Valence bond theory predicts that bromine will use _____ hybrid orbitals in BrF5.

Accepted Answer

A)  sp2 
B)  sp3 
C)  sp3d 
D)  sp3d 2 
E)  none of the above 
A)  sp2 
B)  sp3 
C)  sp3d 
D)  sp3d 2 
E)  none of the above

Question 17

A molecule with the formula AX4 uses _________ to form its 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 18

Determine the shape (geometry) of PCl3 and then decide on the appropriate hybridization of phosphorus in this molecule. (Phosphorus is the central atom.)

Accepted Answer

A)  sp3 
B)  sp2 
C)  sp 
D)  sp3d 
E)  sp3d 2 
A)  sp3 
B)  sp2 
C)  sp 
D)  sp3d 
E)  sp3d 2

Exam 11: Theories of Covalent Bonding

Overlap of two sp2 hybrid orbitals produces a  bond.

According to valence bond theory, the triple bond in ethyne (acetylene, C2H2) consists of

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

How many sigma and pi bonds, respectively, are in the molecule below? CH3CH2CHCHCH3?

According to the molecular orbital (MO) treatment of the NO molecule, what are the bond order and the number of unpaired electrons, respectively?

In molecular orbital theory, combination of two atomic orbitals produces two molecular orbitals.

Which one of the following statements about orbital hybridization is incorrect?

Valence bond theory explains the bonding in diatomic molecules such as HCl without resorting to the use of hybrid orbitals.

According to valence bond theory, which of the following molecules involves sp2 hybridization of orbitals on the central atom? (central atom is bold)

A carbon-carbon triple bond in a molecule may give rise to the existence of cis and trans isomers.

A molecule with the formula AX3 uses __________ to form its bonds.

Valence bond theory predicts that iodine will use _____ hybrid orbitals in ICl2-.

In one sentence state the basic principle of valence bond theory.

According to molecular orbital (MO) theory, the twelve outermost electrons in the O2 molecule are distributed as follows:

Valence bond theory predicts that carbon will use _____ hybrid orbitals in the carbonate anion, CO32-.

Valence bond theory predicts that bromine will use _____ hybrid orbitals in BrF5.

A molecule with the formula AX4 uses _________ to form its bonds.

Determine the shape (geometry) of PCl3 and then decide on the appropriate hybridization of phosphorus in this molecule. (Phosphorus is the central atom.)

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

The Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main Group Elements: Bonding, Structure, and Reactivity

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, Free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Overlap of two sp² hybrid orbitals produces a  bond.

According to valence bond theory, the triple bond in ethyne (acetylene, C₂H₂) consists of

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

How many sigma and pi bonds, respectively, are in the molecule below? CH₃CH₂CHCHCH₃?

According to valence bond theory, which of the following molecules involves sp² hybridization of orbitals on the central atom? (central atom is bold)

A molecule with the formula AX₃ uses __________ to form its bonds.

Valence bond theory predicts that iodine will use _____ hybrid orbitals in ICl₂^-.

According to molecular orbital (MO) theory, the twelve outermost electrons in the O₂ molecule are distributed as follows:

Valence bond theory predicts that carbon will use _____ hybrid orbitals in the carbonate anion, CO₃^2-.

Valence bond theory predicts that bromine will use _____ hybrid orbitals in BrF₅.

A molecule with the formula AX₄uses _________ to form its bonds.

Determine the shape (geometry) of PCl₃ and then decide on the appropriate hybridization of phosphorus in this molecule. (Phosphorus is the central atom.)