Question 1

A molecule with the formula AX2 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 A

Question 2

Valence bond theory predicts that tin will use _____ hybrid orbitals in SnF5-.

Accepted Answer

A)  sp2 
B)  sp3 
C)  sp3d 
D)  sp3d2 
E)  d2sp3 
A)  sp2 
B)  sp3 
C)  sp3d 
D)  sp3d2 
E)  d2sp3 C

Question 3

When PCl5 solidifies it forms PCl4+ cations and PCl6-anions. According to valence bond theory, what hybrid orbitals are used by phosphorus in the PCl4+ cations?

Accepted Answer

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

Question 4

The lone pair of electrons on sulfur in the sulfite ion (SO32-) is in

Accepted Answer

A)  a p orbital. 
B)  an s orbital. 
C)  an sp2 hybrid orbital. 
D)  an sp3 hybrid orbital. 
E)  none of these orbital types. 
A)  a p orbital. 
B)  an s orbital. 
C)  an sp2 hybrid orbital. 
D)  an sp3 hybrid orbital. 
E)  none of these orbital types.

Question 5

The angles between sp2 hybrid orbitals are 109.5°.

Accepted Answer

A) True 
 B)False

Question 6

In applying molecular orbital theory, the bond order is calculated in the same way as with Lewis structures.

Accepted Answer

A) True 
 B)False

Question 7

Which one, if any, of the following statements about the MO treatment of the bonding in benzene is correct?

Accepted Answer

A)  MO theory uses resonance to describe the delocalized nature of the bonding in benzene. 
B)  The lowest energy pi-bonding orbital in benzene can hold up to 6 electrons. 
C)  MO theory predicts that benzene should be paramagnetic. 
D)  The lowest energy pi-bonding MO in benzene has two hexagonal lobes, above and below the plane of the carbon atoms. 
E)  None of these choices are correct. 
A)  MO theory uses resonance to describe the delocalized nature of the bonding in benzene. 
B)  The lowest energy pi-bonding orbital in benzene can hold up to 6 electrons. 
C)  MO theory predicts that benzene should be paramagnetic. 
D)  The lowest energy pi-bonding MO in benzene has two hexagonal lobes, above and below the plane of the carbon atoms. 
E)  None of these choices are correct.

Question 8

In molecular orbital theory, molecules with an even number of electrons will have bond orders which are whole numbers.

Accepted Answer

A) True 
 B)False

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

One can safely assume that the 3s- and 3p-orbitals will form molecular orbitals similar to those formed when 2s- and 2p-orbitals interact. According to molecular orbital theory, what will be the bond order for the Cl2+ ion?

Accepted Answer

A)  0.5 
B)  1 
C)  1.5 
D)  2 
E)  None of these choices are correct. 
A)  0.5 
B)  1 
C)  1.5 
D)  2 
E)  None of these choices are correct.

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

Which of the following statements relating to molecular orbital (MO) theory is incorrect?

Accepted Answer

A)  Combination of two atomic orbitals produces one bonding and one antibonding MO. 
B)  A bonding MO is lower in energy than the two atomic orbitals from which it is formed. 
C)  Combination of two 2p orbitals may result in either σ or   MOs. 
D)  A species with a bond order of zero will not be stable. 
E)  In a stable molecule having an even number of electrons, all electrons must be paired. 
A)  Combination of two atomic orbitals produces one bonding and one antibonding MO. 
B)  A bonding MO is lower in energy than the two atomic orbitals from which it is formed. 
C)  Combination of two 2p orbitals may result in either σ or   MOs. 
D)  A species with a bond order of zero will not be stable. 
E)  In a stable molecule having an even number of electrons, all electrons must be paired.

Question 13

According to molecular orbital theory, all diatomic molecules with an even number of electrons will be diamagnetic.

Accepted Answer

A) True 
 B)False

Question 14

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 15

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 16

For which one of the following molecules is the indicated type of hybridization not appropriate for the central atom?

Accepted Answer

A)  BeCl2 sp2 
B)  SiH4 sp3 
C)  BF3 sp2 
D)  C2H2 sp 
E)  H2O sp3 
A)  BeCl2 sp2 
B)  SiH4 sp3 
C)  BF3 sp2 
D)  C2H2 sp 
E)  H2O sp3

Question 17

Valence bond theory predicts that tin will use _____ hybrid orbitals in SnCl3-.

Accepted Answer

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

Question 18

A molecule with the formula AX4E2 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 19

According to molecular orbital theory, what is the bond order in the O2+ ion?

Accepted Answer

A)  5.5 
B)  5 
C)  4 
D)  2.5 
E)  1.5 
A)  5.5 
B)  5 
C)  4 
D)  2.5 
E)  1.5

Question 20

A molecule with the formula AX4E uses _________ to form its bonds.

Accepted Answer

A)  sp2 hybrid orbitals 
B)  sp3 hybrid orbitals 
C)  sp3d hybrid orbitals 
D)  sp3d2 hybrid orbitals 
E)  None of these choices are correct. 
A)  sp2 hybrid orbitals 
B)  sp3 hybrid orbitals 
C)  sp3d hybrid orbitals 
D)  sp3d2 hybrid orbitals 
E)  None of these choices are correct.

Exam 11: Theories of Covalent Bonding

A molecule with the formula AX2 uses _________ to form its bonds.

Valence bond theory predicts that tin will use _____ hybrid orbitals in SnF5-.

When PCl5 solidifies it forms PCl4+ cations and PCl6-anions. According to valence bond theory, what hybrid orbitals are used by phosphorus in the PCl4+ cations?

The lone pair of electrons on sulfur in the sulfite ion (SO32-) is in

The angles between sp2 hybrid orbitals are 109.5°.

In applying molecular orbital theory, the bond order is calculated in the same way as with Lewis structures.

Which one, if any, of the following statements about the MO treatment of the bonding in benzene is correct?

In molecular orbital theory, molecules with an even number of electrons will have bond orders which are whole numbers.

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

One can safely assume that the 3s- and 3p-orbitals will form molecular orbitals similar to those formed when 2s- and 2p-orbitals interact. According to molecular orbital theory, what will be the bond order for the Cl2+ ion?

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

Which of the following statements relating to molecular orbital (MO) theory is incorrect?

According to molecular orbital theory, all diatomic molecules with an even number of electrons will be diamagnetic.

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

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

For which one of the following molecules is the indicated type of hybridization not appropriate for the central atom?

Valence bond theory predicts that tin will use _____ hybrid orbitals in SnCl3-.

A molecule with the formula AX4E2 uses _________ to form its bonds.

According to molecular orbital theory, what is the bond order in the O2+ ion?

A molecule with the formula AX4E uses _________ to form its bonds.

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

A molecule with the formula AX₂ uses _________ to form its bonds.

Valence bond theory predicts that tin will use _____ hybrid orbitals in SnF₅^-.

When PCl₅ solidifies it forms PCl₄⁺ cations and PCl₆^-anions. According to valence bond theory, what hybrid orbitals are used by phosphorus in the PCl₄⁺ cations?

The lone pair of electrons on sulfur in the sulfite ion (SO₃^2-) is in

The angles between sp² hybrid orbitals are 109.5°.

One can safely assume that the 3s- and 3p-orbitals will form molecular orbitals similar to those formed when 2s- and 2p-orbitals interact. According to molecular orbital theory, what will be the bond order for the Cl₂⁺ ion?

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

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

Valence bond theory predicts that tin will use _____ hybrid orbitals in SnCl₃^-.

A molecule with the formula AX₄E₂ uses _________ to form its bonds.

According to molecular orbital theory, what is the bond order in the O₂⁺ ion?

A molecule with the formula AX₄E uses _________ to form its bonds.