Question 1

The following valence molecular orbital energy level diagram is appropriate for which one of the listed species?

Accepted Answer

A)  B22+ 
B)  C22+ 
C)  N22+ 
D)  O22+ 
E)  F22+ 
A)  B22+ 
B)  C22+ 
C)  N22+ 
D)  O22+ 
E)  F22+

Question 2

Which of the following does $\underline{\text{ not  }}$ contain at least one pi bond?

Accepted Answer

A)  HCN 
B)  C2H6 
C)  CO 
D)  C2H2 
E)  All of them have one or more pi bonds. 
A)  HCN 
B)  C2H6 
C)  CO 
D)  C2H2 
E)  All of them have one or more pi bonds.

Question 3

What is the bond order for a molecule with 6 electrons in bonding molecular orbitals and 6 electrons in antibonding molecular orbitals?

Accepted Answer

A)  0 
B)  0.5 
C)  1 
D)  1.5 
E)  2 
A)  0 
B)  0.5 
C)  1 
D)  1.5 
E)  2

Question 4

What is the molecular geometry around an atom that has 2 $\sigma$ bonds,0 $\pi$ bonds,and 1 lone pair of electrons?

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 5

Nitric acid,HNO3,dissociates in water to form nitrate ions and hydronium ions.What change in hybridization of the nitrogen atom occurs in this dissociation?

Accepted Answer

A)  sp2 to sp3 
B)  sp2 to sp 
C)  sp3 to sp 
D)  sp to sp3 
E)  no change 
A)  sp2 to sp3 
B)  sp2 to sp 
C)  sp3 to sp 
D)  sp to sp3 
E)  no change

Question 6

For which of the following molecules and ions does the central atom have sp2 hybridization? (The central atom is listed first in each formula below.)

Accepted Answer

A)  SO42- 
B)  CO2 
C)  NOBr 
D)  SBr2 
E)  N2O 
A)  SO42- 
B)  CO2 
C)  NOBr 
D)  SBr2 
E)  N2O

Question 7

In HF2- the hydrogen is shared between the two fluorine atoms.Which theory,valence bond or molecule orbital,correctly accounts for this three-center bonding?

Accepted Answer

molecular

Question 8

To form a molecule with a linear electron pair geometry,what set of pure atomic orbitals must be mixed?

Accepted Answer

A)  one s and one p 
B)  one s and two p 
C)  one s and three p 
D)  two s and one p 
E)  zero s and three p 
A)  one s and one p 
B)  one s and two p 
C)  one s and three p 
D)  two s and one p 
E)  zero s and three p

Question 9

A molecular orbital that decreases the electron density between two nuclei is said to be ____.
A)hybridized
B)bonding
B)antibonding
D)pi-bonding
E)nonpolar

Accepted Answer

The answer of A molecular orbital that decreases the electron...

Question 10

SF3+,has a tetrahedral electron-pair geometry and a trigonal-pyramidal molecular geometry.The hybridization of the central sulfur atom is ________.

Accepted Answer

Question 11

What is the hybridization of each carbon atom in benzene,C6H6? Benzene contains a six-member carbon ring.

Accepted Answer

A)  sp 
B)  sp2 
C)  sp3 
D)  sp4 
E)  sp5 
A)  sp 
B)  sp2 
C)  sp3 
D)  sp4 
E)  sp5

Question 12

Which of the following statements is/are CORRECT according to valence bond theory?
1)Elelctron density in a pi bond is greatest along the axis of the bond.
2)The overlap of two adjacent p orbitals can result in a sigma bond or a pi bond,depending on the p-orbital orientations.
3)Bonds are formed in molecules through the overlap of valence electron atomic orbitals.

Accepted Answer

A)  1 only 
B)  2 only 
C)  3 only 
D)  2 and 3 
E)  1,2,and 3 
A)  1 only 
B)  2 only 
C)  3 only 
D)  2 and 3 
E)  1,2,and 3

The following valence molecular orbital energy level diagram is appropriate for which one of the listed species?

Which of the following does $\underline{\text{ not }}$ contain at least one pi bond?

What is the bond order for a molecule with 6 electrons in bonding molecular orbitals and 6 electrons in antibonding molecular orbitals?

What is the molecular geometry around an atom that has 2 $\sigma$ bonds,0 $\pi$ bonds,and 1 lone pair of electrons?

Nitric acid,HNO₃,dissociates in water to form nitrate ions and hydronium ions.What change in hybridization of the nitrogen atom occurs in this dissociation?

For which of the following molecules and ions does the central atom have sp² hybridization? (The central atom is listed first in each formula below.)

In HF₂^- the hydrogen is shared between the two fluorine atoms.Which theory,valence bond or molecule orbital,correctly accounts for this three-center bonding?

To form a molecule with a linear electron pair geometry,what set of pure atomic orbitals must be mixed?

A molecular orbital that decreases the electron density between two nuclei is said to be ____. A)hybridized B)bonding B)antibonding D)pi-bonding E)nonpolar

SF₃⁺,has a tetrahedral electron-pair geometry and a trigonal-pyramidal molecular geometry.The hybridization of the central sulfur atom is ________.

What is the hybridization of each carbon atom in benzene,C₆H₆? Benzene contains a six-member carbon ring.

Basic Concepts of Chemistry

Mathlets Review: The Tools of Quantitative Chemistry

Atoms, molecules, and Ions

Chemical Reactions

Stoichiometry: Quantitative Information About Chemical Reactions

Principles of Chemical Reactivity: Energy and Chemical Reactions

The Structure of Atoms

The Structure of Atoms and Periodic Trends

Bonding and Molecular Structure

Gases and Their Properties

Intermolecular Forces and Liquids

The Chemistry of Solids

Solutions and Their Behavior

Chemical Kinetics: the Rates of Chemical Reactions

Principles of Reactivity: Chemical Equilibria

The Chemistry of Acids and Bases

Principles of Reactivity: Other Aspects of Aqueous Equilibria

Entropy and Free Energy

Principles of Reactivity: Electron Transfer Reactions

Environmental Chemistry Earths Environment,energy,and Sustainability

The Chemistry of the Main Group Elements

The Chemistry of the Transition Elements

Carbon: Not Just Another Element

Biochemistry

Nuclear Chemistry

Filters

Exam 10: Bonding and Molecular Structure: Orbital Hybridization and Molecular Orbitals

The following valence molecular orbital energy level diagram is appropriate for which one of the listed species?

Which of the following does not ‾\underline{\text{ not }} not ​ contain at least one pi bond?

What is the bond order for a molecule with 6 electrons in bonding molecular orbitals and 6 electrons in antibonding molecular orbitals?

What is the molecular geometry around an atom that has 2 σ\sigmaσ bonds,0 π\piπ bonds,and 1 lone pair of electrons?

Nitric acid,HNO3,dissociates in water to form nitrate ions and hydronium ions.What change in hybridization of the nitrogen atom occurs in this dissociation?

For which of the following molecules and ions does the central atom have sp2 hybridization? (The central atom is listed first in each formula below.)

In HF2- the hydrogen is shared between the two fluorine atoms.Which theory,valence bond or molecule orbital,correctly accounts for this three-center bonding?

To form a molecule with a linear electron pair geometry,what set of pure atomic orbitals must be mixed?

A molecular orbital that decreases the electron density between two nuclei is said to be ____. A)hybridized B)bonding B)antibonding D)pi-bonding E)nonpolar

SF3+,has a tetrahedral electron-pair geometry and a trigonal-pyramidal molecular geometry.The hybridization of the central sulfur atom is ________.

What is the hybridization of each carbon atom in benzene,C6H6? Benzene contains a six-member carbon ring.

Basic Concepts of Chemistry

Mathlets Review: The Tools of Quantitative Chemistry

Atoms, molecules, and Ions

Chemical Reactions

Stoichiometry: Quantitative Information About Chemical Reactions

Principles of Chemical Reactivity: Energy and Chemical Reactions

The Structure of Atoms

The Structure of Atoms and Periodic Trends

Bonding and Molecular Structure

Gases and Their Properties

Intermolecular Forces and Liquids

The Chemistry of Solids

Solutions and Their Behavior

Chemical Kinetics: the Rates of Chemical Reactions

Principles of Reactivity: Chemical Equilibria

The Chemistry of Acids and Bases

Principles of Reactivity: Other Aspects of Aqueous Equilibria

Entropy and Free Energy

Principles of Reactivity: Electron Transfer Reactions

Environmental Chemistry Earths Environment,energy,and Sustainability

The Chemistry of the Main Group Elements

The Chemistry of the Transition Elements

Carbon: Not Just Another Element

Biochemistry

Nuclear Chemistry

Filters

Which of the following does $\underline{\text{ not }}$ contain at least one pi bond?

What is the molecular geometry around an atom that has 2 $\sigma$ bonds,0 $\pi$ bonds,and 1 lone pair of electrons?

Nitric acid,HNO₃,dissociates in water to form nitrate ions and hydronium ions.What change in hybridization of the nitrogen atom occurs in this dissociation?

For which of the following molecules and ions does the central atom have sp² hybridization? (The central atom is listed first in each formula below.)

In HF₂^- the hydrogen is shared between the two fluorine atoms.Which theory,valence bond or molecule orbital,correctly accounts for this three-center bonding?

SF₃⁺,has a tetrahedral electron-pair geometry and a trigonal-pyramidal molecular geometry.The hybridization of the central sulfur atom is ________.

What is the hybridization of each carbon atom in benzene,C₆H₆? Benzene contains a six-member carbon ring.