Question 1

What is the hybridization of the central nitrogen atom in N2O?

Accepted Answer

A)  sp 
B)  sp2 
C)  sp3 
D)  none 
A)  sp 
B)  sp2 
C)  sp3 
D)  none A

Question 2

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 C

Question 3

Which of the underlined atoms (C1,C2,N,and O)are sp2 hybridized?

Accepted Answer

A)  N and O 
B)  C1 and N 
C)  C1 and O 
D)  C2 and N 
E)  C1 and C2 
A)  N and O 
B)  C1 and N 
C)  C1 and O 
D)  C2 and N 
E)  C1 and C2 E

Question 4

In valence bond theory,each sigma bond in CH4 is formed from the overlap of a hydrogen atom's 1s orbital with a(n)________ hybridized orbital on the carbon atom.

Accepted Answer

Question 5

What is the hybridization of oxygen atom O?

Accepted Answer

A)  sp 
B)  sp2 
C)  sp3 
D)  sp4 
E)  none 
A)  sp 
B)  sp2 
C)  sp3 
D)  sp4 
E)  none

Question 6

What is the molecular geometry around an atom that has 2 σ bonds,2 π bonds,and 0 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 7

A molecular orbital that decreases the electron density between two nuclei is said to be ____.

Accepted Answer

A)  hybridized 
B)  bonding 
C)  antibonding 
D)  pi-bonding 
E)  nonpolar 
A)  hybridized 
B)  bonding 
C)  antibonding 
D)  pi-bonding 
E)  nonpolar

Question 8

How many sigma and pi bonds are in the molecule pictured below?

Accepted Answer

A)  thirteen sigma bonds and one pi bond 
B)  eleven sigma bonds and two pi bonds 
C)  thirteen sigma bonds and two pi bonds 
D)  eleven sigma bonds and five pi bonds 
E)  five sigma bonds and eleven pi bonds 
A)  thirteen sigma bonds and one pi bond 
B)  eleven sigma bonds and two pi bonds 
C)  thirteen sigma bonds and two pi bonds 
D)  eleven sigma bonds and five pi bonds 
E)  five sigma bonds and eleven pi bonds

Question 9

How many sigma (σ)bonds and pi (π)bonds are present in the given molecule?

Accepted Answer

A)  Seven σ and three π 
B)  Seven σ and two π 
C)  Five σ and five π 
D)  Five σ and three π 
E)  Five σ and two π 
A)  Seven σ and three π 
B)  Seven σ and two π 
C)  Five σ and five π 
D)  Five σ and three π 
E)  Five σ and two π

Question 10

For which of the following molecules or ions does the central atom have sp hybridization: N3-,O3,and SF3+?

Accepted Answer

A)  N3- only 
B)  O3 only 
C)  SF3+ only 
D)  O3 and SF3+ 
E)  SF3+ and N3- 
A)  N3- only 
B)  O3 only 
C)  SF3+ only 
D)  O3 and SF3+ 
E)  SF3+ and N3-

Question 11

Refer to Diagram 9-1.According to molecular orbital theory,what is the bond order of O2-?

Accepted Answer

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

Question 12

What does the following figure represent?

Accepted Answer

A)  the overlap of two 1s orbitals to form a σ bond 
B)  the overlap of two 2p orbitals to form a σ bond 
C)  the overlap of two 2p orbitals to form a π bond 
D)  the overlap of a 1s orbital and a 2p orbital to form a σ bond 
E)  the overlap of a 1s orbital and a 2p orbital to form a π bond 
A)  the overlap of two 1s orbitals to form a σ bond 
B)  the overlap of two 2p orbitals to form a σ bond 
C)  the overlap of two 2p orbitals to form a π bond 
D)  the overlap of a 1s orbital and a 2p orbital to form a σ bond 
E)  the overlap of a 1s orbital and a 2p orbital to form a π bond

Question 13

What is the hybridization of carbon atoms present in acetylene?

Accepted Answer

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

Question 14

Refer to Diagram 9-1.Assuming that the molecular orbital energy diagram for a homonuclear diatomic molecule applies to a heteronuclear diatomic molecule,which of the following species is paramagnetic?

Accepted Answer

A)  NO+ 
B)  CO 
C)  CN- 
D)  OF- 
E)  NO 
A)  NO+ 
B)  CO 
C)  CN- 
D)  OF- 
E)  NO

Question 15

Refer to Diagram 9-1.According to molecular orbital theory,which of the following species will be paramagnetic?

Accepted Answer

A)  Li2 
B)  C2 
C)  C2- 
D)  F2 
E)  O22+ 
A)  Li2 
B)  C2 
C)  C2- 
D)  F2 
E)  O22+

Question 16

Atomic orbitals combine most effectively to form molecular orbitals when

Accepted Answer

A)  electrons in the orbitals have no spins. 
B)  electrons in the orbitals have the same spin. 
C)  the atoms have an equal number of valence electrons. 
D)  the atomic orbitals have similar energies. 
E)  only d-orbitals are used in bonding. 
A)  electrons in the orbitals have no spins. 
B)  electrons in the orbitals have the same spin. 
C)  the atoms have an equal number of valence electrons. 
D)  the atomic orbitals have similar energies. 
E)  only d-orbitals are used in bonding.

Question 17

Which theory,valence bond or molecule orbital,correctly predicts the existence of paramagnetic molecules?

Accepted Answer

Molecular

Question 18

For which of the following compounds is it possible for cis and trans isomers to exist?

Accepted Answer

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

Question 19

Refer to Diagram 9-1.Assuming that the molecular orbital energy diagram for a homonuclear diatomic molecule applies to a heteronuclear diatomic molecule,determine which of the following species has the highest bond order.

Accepted Answer

A)  NO- 
B)  OF- 
C)  C2 
D)  O22- 
E)  NO+ 
A)  NO- 
B)  OF- 
C)  C2 
D)  O22- 
E)  NO+

Question 20

Refer to Diagram 9-1.According to molecular orbital theory,which of the following species will have only one unpaired electron?

Accepted Answer

A)  C2 
B)  Ne22+ 
C)  O22- 
D)  N2 
E)  O2+ 
A)  C2 
B)  Ne22+ 
C)  O22- 
D)  N2 
E)  O2+

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

What is the hybridization of the central nitrogen atom in N2O?

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.)

Which of the underlined atoms (C1,C2,N,and O)are sp2 hybridized?

In valence bond theory,each sigma bond in CH4 is formed from the overlap of a hydrogen atom's 1s orbital with a(n)________ hybridized orbital on the carbon atom.

What is the hybridization of oxygen atom O?

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

A molecular orbital that decreases the electron density between two nuclei is said to be ____.

How many sigma and pi bonds are in the molecule pictured below?

How many sigma (σ)bonds and pi (π)bonds are present in the given molecule?

For which of the following molecules or ions does the central atom have sp hybridization: N3-,O3,and SF3+?

Refer to Diagram 9-1.According to molecular orbital theory,what is the bond order of O2-?

What does the following figure represent?

What is the hybridization of carbon atoms present in acetylene?

Refer to Diagram 9-1.Assuming that the molecular orbital energy diagram for a homonuclear diatomic molecule applies to a heteronuclear diatomic molecule,which of the following species is paramagnetic?

Refer to Diagram 9-1.According to molecular orbital theory,which of the following species will be paramagnetic?

Atomic orbitals combine most effectively to form molecular orbitals when

Which theory,valence bond or molecule orbital,correctly predicts the existence of paramagnetic molecules?

For which of the following compounds is it possible for cis and trans isomers to exist?

Refer to Diagram 9-1.Assuming that the molecular orbital energy diagram for a homonuclear diatomic molecule applies to a heteronuclear diatomic molecule,determine which of the following species has the highest bond order.

Refer to Diagram 9-1.According to molecular orbital theory,which of the following species will have only one unpaired electron?

Basic Concepts of Chemistry

Lets 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 Solid State

Solutions and Their Behavior

Chemical Kinetics: the Rates of Chemical Reactions

Principles of Chemical Reactivity: Equilibria

Principles of Chemical Reactivity: the Chemistry of Acids and Bases

Principles of Chemical Reactivity: Other Aspects of Aqueous Equilibria

Principles of Chemical Reactivity: Entropy and Free Energy

Principles of Chemical 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

What is the hybridization of the central nitrogen atom in N₂O?

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.)

Which of the underlined atoms (C₁,C₂,N,and O)are sp² hybridized?

In valence bond theory,each sigma bond in CH₄ is formed from the overlap of a hydrogen atom's 1s orbital with a(n)________ hybridized orbital on the carbon atom.

For which of the following molecules or ions does the central atom have sp hybridization: N₃^-,O₃,and SF₃+?

Refer to Diagram 9-1.According to molecular orbital theory,what is the bond order of O₂-?