Question 1

According to valence bond theory, which orbitals on N and H overlap in the NH3 molecule?

Accepted Answer

A)  2p on N overlaps with 2s on H 
B)  2p on N overlaps with 1s on H 
C)  2s on N overlaps with 1s on H 
D)  sp3 on N overlaps with sp on H 
E)  sp3 on N overlaps with 1s on H 
A)  2p on N overlaps with 2s on H 
B)  2p on N overlaps with 1s on H 
C)  2s on N overlaps with 1s on H 
D)  sp3 on N overlaps with sp on H 
E)  sp3 on N overlaps with 1s on H

Question 2

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 3

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

Question 4

In molecular orbital theory, combination of two 2p atomic orbitals may give rise to either σ or π type molecular orbitals.

Accepted Answer

A) True 
 B)False

Question 5

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 6

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

Accepted Answer

A) True 
 B)False

Question 7

Valence bond theory predicts that xenon will use _____ hybrid orbitals in XeOF4.

Accepted Answer

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

Question 8

A molecule with the formula AX3E uses _________ to form its bonds.

Accepted Answer

A)  s and p atomic orbitals 
B)  sp3 hybrid orbitals 
C)  sp2 hybrid orbitals 
D)  sp hybrid orbitals 
E)  sp3d2 hybrid orbitals 
A)  s and p atomic orbitals 
B)  sp3 hybrid orbitals 
C)  sp2 hybrid orbitals 
D)  sp hybrid orbitals 
E)  sp3d2 hybrid orbitals

Question 9

In the valence bond treatment, overlap of an s orbital on one atom with an sp3 orbital on another atom can give rise to a σ bond.

Accepted Answer

A) True 
 B)False

Question 10

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 11

Valence bond theory predicts that bromine will use _____ hybrid orbitals in BrF3.

Accepted Answer

A)  sp2 
B)  sp3 
C)  sp3d 
D)  sp4 
E)  sp3d2 
A)  sp2 
B)  sp3 
C)  sp3d 
D)  sp4 
E)  sp3d2

Question 12

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 13

Hybrid orbitals of the sp3d type occur in sets of four.

Accepted Answer

A) True 
 B)False

Question 14

The nitrosonium ion, NO+, forms a number of interesting complexes with nickel, cobalt, and iron. According to molecular orbital theory, which of the following statements about NO+ is correct?

Accepted Answer

A)  NO+ has a bond order of 2 and is paramagnetic. 
B)  NO+ has a bond order of 2 and is diamagnetic. 
C)  NO+ has a bond order of 3 and is paramagnetic. 
D)  NO+ has a bond order of 3 and is diamagnetic. 
E)  None of these choices are correct. 
A)  NO+ has a bond order of 2 and is paramagnetic. 
B)  NO+ has a bond order of 2 and is diamagnetic. 
C)  NO+ has a bond order of 3 and is paramagnetic. 
D)  NO+ has a bond order of 3 and is diamagnetic. 
E)  None of these choices are correct.

Question 15

Overlap of two sp2 hybrid orbitals produces a   bond.

Accepted Answer

A) True 
 B)False

Question 16

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

Accepted Answer

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

Question 17

Carbon uses ______ hybrid orbitals in ClCN.

Accepted Answer

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

Question 18

In the valence bond treatment, a   bond is formed when two 2p orbitals overlap side to side.

Accepted Answer

A) True 
 B)False

Question 19

According to valence bond theory, overlap of bonding orbitals of atoms will weaken a bond, due to electron-electron repulsion.

Accepted Answer

A) True 
 B)False

Question 20

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

Accepted Answer

A)  three σ bonds and no   bonds. 
B)  two σ bonds and one   bond. 
C)  one σ bond and two   bonds. 
D)  no σ bonds and three   bonds. 
E)  None of these choices are correct. 
A)  three σ bonds and no   bonds. 
B)  two σ bonds and one   bond. 
C)  one σ bond and two   bonds. 
D)  no σ bonds and three   bonds. 
E)  None of these choices are correct.

Exam 11: Theories of Covalent Bonding

According to valence bond theory, which orbitals on N and H overlap in the NH3 molecule?

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

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

In molecular orbital theory, combination of two 2p atomic orbitals may give rise to either σ or π type molecular orbitals.

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

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

Valence bond theory predicts that xenon will use _____ hybrid orbitals in XeOF4.

A molecule with the formula AX3E uses _________ to form its bonds.

In the valence bond treatment, overlap of an s orbital on one atom with an sp3 orbital on another atom can give rise to a σ bond.

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

Valence bond theory predicts that bromine will use _____ hybrid orbitals in BrF3.

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

Hybrid orbitals of the sp3d type occur in sets of four.

The nitrosonium ion, NO+, forms a number of interesting complexes with nickel, cobalt, and iron. According to molecular orbital theory, which of the following statements about NO+ is correct?

Overlap of two sp2 hybrid orbitals produces a bond.

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

Carbon uses ______ hybrid orbitals in ClCN.

In the valence bond treatment, a bond is formed when two 2p orbitals overlap side to side.

According to valence bond theory, overlap of bonding orbitals of atoms will weaken a bond, due to electron-electron repulsion.

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

Keys to Studying Chemistry Definitions, Units, and Problem Solving

The Components of Matter

Stoichiometry of Formulas and Equations

Three 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

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 Reaction Direction

Electrochemistry Chemical Change and Electrical Work

The Elements in Nature and Industry

Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

According to valence bond theory, which orbitals on N and H overlap in the NH₃ molecule?

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

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

Valence bond theory predicts that xenon will use _____ hybrid orbitals in XeOF₄.

A molecule with the formula AX₃E uses _________ to form its bonds.

In the valence bond treatment, overlap of an s orbital on one atom with an sp³ orbital on another atom can give rise to a σ bond.

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

Valence bond theory predicts that bromine will use _____ hybrid orbitals in BrF₃.

Hybrid orbitals of the sp³d type occur in sets of four.

The nitrosonium ion, NO⁺, forms a number of interesting complexes with nickel, cobalt, and iron. According to molecular orbital theory, which of the following statements about NO⁺ is correct?

Overlap of two sp² hybrid orbitals produces a bond.

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

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