Question 1

Which electron-pair geometry corresponds to a steric number of 4?

Accepted Answer

A)  linear 
B)  trigonal planar 
C)  tetrahedral 
D)  trigonal bipyramidal 
E)  octahedral 
A)  linear 
B)  trigonal planar 
C)  tetrahedral 
D)  trigonal bipyramidal 
E)  octahedral

Question 2

Which of the following molecules is T-shaped?

Accepted Answer

A)  NCl3 
B)  PCl3 
C)  SbCl3 
D)  ICl3 
E)  COCl2 
A)  NCl3 
B)  PCl3 
C)  SbCl3 
D)  ICl3 
E)  COCl2

Question 3

Which statement concerning benzene is not correct?

Accepted Answer

A)  A second resonance structure is needed to describe benzene. 
B)  All the  $\pi$bonds originate from p atomic orbitals. 
C)  Benzene does not have a dipole moment. 
D)  The carbon atomic orbitals are sp2 hybridized. 
E)  Benzene has both long and short carbon-carbon bonds. 
A)  A second resonance structure is needed to describe benzene. 
B)  All the  $\pi$bonds originate from p atomic orbitals. 
C)  Benzene does not have a dipole moment. 
D)  The carbon atomic orbitals are sp2 hybridized. 
E)  Benzene has both long and short carbon-carbon bonds.

Question 4

Which of the following compounds has the smallest dipole moment?

Accepted Answer

A)  CF2Cl2 
B)  CF3Cl 
C)  CF4 
D)  CFCl3 
E)  CHFCl2 
A)  CF2Cl2 
B)  CF3Cl 
C)  CF4 
D)  CFCl3 
E)  CHFCl2

Question 5

Ethanol has the formula CH3CH2OH. The end carbon atom has a ________ local molecular geometry and ________ hybridization.

Accepted Answer

A)  trigonal planar; sp 
B)  tetrahedral; sp3 
C)  tetrahedral; sp2 
D)  seesaw; sp2 
E)  seesaw; sp3 
A)  trigonal planar; sp 
B)  tetrahedral; sp3 
C)  tetrahedral; sp2 
D)  seesaw; sp2 
E)  seesaw; sp3

Question 6

Which of the following compounds has the largest dipole moment?

Accepted Answer

A)  CH2Cl2 
B)  CH3Cl 
C)  CHCl3 
D)  CCl4 
E)  CH4 
A)  CH2Cl2 
B)  CH3Cl 
C)  CHCl3 
D)  CCl4 
E)  CH4

Question 7

Which of the following compounds has a square pyramid geometry?

Accepted Answer

A)  ICl3 
B)  BrF5 
C)  PCl5 
D)  PH3 
E)  SiF4 
A)  ICl3 
B)  BrF5 
C)  PCl5 
D)  PH3 
E)  SiF4

Question 8

Which one of the following species has four electrons in antibonding pi molecular orbitals?

Accepted Answer

A)  C22- 
B)  O2+ 
C)  N22- 
D)  Br2+ 
E)  Br22- 
A)  C22- 
B)  O2+ 
C)  N22- 
D)  Br2+ 
E)  Br22-

Question 9

Which of the following molecules is paramagnetic?

Accepted Answer

A)  Li2 
B)  C2 
C)  B2 
D)  N2 
E)  F2 
A)  Li2 
B)  C2 
C)  B2 
D)  N2 
E)  F2

Question 10

Which type of molecular orbital contains a node perpendicular to the axis connecting two atomic nuclei?

Accepted Answer

A)  ($\sigma$) 
B)  ( $\pi$) 
C)  ($\sigma$*) 
D)  s 
E)  p 
A)  ($\sigma$) 
B)  ( $\pi$) 
C)  ($\sigma$*) 
D)  s 
E)  p

Question 11

The local molecular geometry and the hybridization around each carbon atom in benzene
(C6H6 with a hexagonal ring structure) is ________

Accepted Answer

A)  square planar and sp. 
B)  trigonal planar and sp. 
C)  tetrahedral and sp3. 
D)  trigonal planar and sp2. 
E)  T-shaped and sp2. 
A)  square planar and sp. 
B)  trigonal planar and sp. 
C)  tetrahedral and sp3. 
D)  trigonal planar and sp2. 
E)  T-shaped and sp2.

Question 12

Which statement about sigma and pi bonds is correct?

Accepted Answer

A)  A pi bond is twice as strong as a sigma bond. 
B)  A pi bond has cylindrical symmetry about the internuclear axis. 
C)  A double bond, as in ethylene, consists of a pi bond and a sigma bond. 
D)  A pi bond, as in ethylene, is described by the overlap of hybridized atomic orbitals. 
E)  Hydrogen forms pi bonds when it bonds to other atoms. 
A)  A pi bond is twice as strong as a sigma bond. 
B)  A pi bond has cylindrical symmetry about the internuclear axis. 
C)  A double bond, as in ethylene, consists of a pi bond and a sigma bond. 
D)  A pi bond, as in ethylene, is described by the overlap of hybridized atomic orbitals. 
E)  Hydrogen forms pi bonds when it bonds to other atoms.

Question 13

A Lewis structure of aspirin without the nonbonding electrons is shown in the figure below. Taking into account the nonbonding electrons, identify the hybridization of the atomic orbitals for the following atoms: O1, O2, and O3. Identify the bond angles around C1, C2, and O3.

Accepted Answer

O1 is sp³ hybridized, O2 is sp²,

Question 14

For which one of the following molecules (BF3, CF4, NF3, OF2, XeF4) is the electron geometry tetrahedral and the molecular geometry triangular pyramidal? Draw its Lewis structure with the correct bond angles.

Accepted Answer

@#IMG-DLM& In the diagram each

Question 15

Which type of molecular orbital is used to describe a buildup of electron density along the axis connecting two atomic nuclei to form a bond?

Accepted Answer

A)  ($\sigma$) 
B)  ( $\pi$) 
C)  ($\sigma$*) 
D)  ( $\pi$*) 
E)  (py) 
A)  ($\sigma$) 
B)  ( $\pi$) 
C)  ($\sigma$*) 
D)  ( $\pi$*) 
E)  (py)

Question 16

Which statement regarding a sigma bond between two carbon atoms is not correct?

Accepted Answer

A)  The region of electron density lies along the bond axis connecting the nuclei of the two atoms. 
B)  The bond can be described by the overlap of sp hybrid orbitals from each atom. 
C)  The bond can be described by the overlap of sp2 hybrid orbitals from each atom. 
D)  The bond can be described by the overlap of sp3d hybrid orbitals from each atom. 
E)  The bond can be described by the overlap of an sp2 hybrid orbital from one atom with an sp3 hybrid orbital from the other atom. 
A)  The region of electron density lies along the bond axis connecting the nuclei of the two atoms. 
B)  The bond can be described by the overlap of sp hybrid orbitals from each atom. 
C)  The bond can be described by the overlap of sp2 hybrid orbitals from each atom. 
D)  The bond can be described by the overlap of sp3d hybrid orbitals from each atom. 
E)  The bond can be described by the overlap of an sp2 hybrid orbital from one atom with an sp3 hybrid orbital from the other atom.

Which electron-pair geometry corresponds to a steric number of 4?

Which of the following molecules is T-shaped?

Which statement concerning benzene is not correct?

Which of the following compounds has the smallest dipole moment?

Ethanol has the formula CH₃CH₂OH. The end carbon atom has a local molecular geometry and hybridization.

Which of the following compounds has the largest dipole moment?

Which of the following compounds has a square pyramid geometry?

Which one of the following species has four electrons in antibonding pi molecular orbitals?

Which of the following molecules is paramagnetic?

Which type of molecular orbital contains a node perpendicular to the axis connecting two atomic nuclei?

The local molecular geometry and the hybridization around each carbon atom in benzene (C₆H₆ with a hexagonal ring structure) is ________

Which statement about sigma and pi bonds is correct?

A Lewis structure of aspirin without the nonbonding electrons is shown in the figure below. Taking into account the nonbonding electrons, identify the hybridization of the atomic orbitals for the following atoms: O1, O2, and O3. Identify the bond angles around C1, C2, and O3.

For which one of the following molecules (BF₃, CF₄, NF₃, OF₂, XeF₄) is the electron geometry tetrahedral and the molecular geometry triangular pyramidal? Draw its Lewis structure with the correct bond angles.

Which type of molecular orbital is used to describe a buildup of electron density along the axis connecting two atomic nuclei to form a bond?

Which statement regarding a sigma bond between two carbon atoms is not correct?

Matter and Energy: The Origin of the Universe

Atoms, Ions, and Molecules: Matter Starts Here

Stoichiometry: Mass, Formulas, and Reactions

Solution Chemistry: The Hydrosphere

Thermochemistry: Energy Changes in Reactions

Properties of Gases: the Air We Breathe

A Quantum Model of Atoms: Waves and Particles

Chemical Bonds: What Makes a Gas a Greenhouse Gas

Intermolecular Forces: The Uniqueness of Water

Solutions: Properties and Behavior

Solids: Structures and Applications

Organic Chemistry: Fuels, Pharmaceuticals, Materials, and Life

Chemical Kinetics: Reactions in the Air We Breathe

Chemical Equilibrium: How Much Product Does a Reaction Really Make

Acid-Base and Solubility Equilibria: Reactions in Soil and Water

Metal Ions: Colorful and Essential

Thermodynamics: Spontaneous and Nonspontaneous Reactions and Processes

Electrochemistry: the Quest for Clean Energy

Biochemistry: the Compounds of Life

Nuclear Chemistry: Applications to Energy and Medicine

Life and the Periodic Table

Filters

Exam 9: Molecular Geometry: Shape Determines Function

Which electron-pair geometry corresponds to a steric number of 4?

Which of the following molecules is T-shaped?

Which statement concerning benzene is not correct?

Which of the following compounds has the smallest dipole moment?

Ethanol has the formula CH3CH2OH. The end carbon atom has a ________ local molecular geometry and ________ hybridization.

Which of the following compounds has the largest dipole moment?

Which of the following compounds has a square pyramid geometry?

Which one of the following species has four electrons in antibonding pi molecular orbitals?

Which of the following molecules is paramagnetic?

Which type of molecular orbital contains a node perpendicular to the axis connecting two atomic nuclei?

The local molecular geometry and the hybridization around each carbon atom in benzene (C6H6 with a hexagonal ring structure) is ________

Which statement about sigma and pi bonds is correct?

A Lewis structure of aspirin without the nonbonding electrons is shown in the figure below. Taking into account the nonbonding electrons, identify the hybridization of the atomic orbitals for the following atoms: O1, O2, and O3. Identify the bond angles around C1, C2, and O3.

For which one of the following molecules (BF3, CF4, NF3, OF2, XeF4) is the electron geometry tetrahedral and the molecular geometry triangular pyramidal? Draw its Lewis structure with the correct bond angles.

Which type of molecular orbital is used to describe a buildup of electron density along the axis connecting two atomic nuclei to form a bond?

Which statement regarding a sigma bond between two carbon atoms is not correct?

Matter and Energy: The Origin of the Universe

Atoms, Ions, and Molecules: Matter Starts Here

Stoichiometry: Mass, Formulas, and Reactions

Solution Chemistry: The Hydrosphere

Thermochemistry: Energy Changes in Reactions

Properties of Gases: the Air We Breathe

A Quantum Model of Atoms: Waves and Particles

Chemical Bonds: What Makes a Gas a Greenhouse Gas

Intermolecular Forces: The Uniqueness of Water

Solutions: Properties and Behavior

Solids: Structures and Applications

Organic Chemistry: Fuels, Pharmaceuticals, Materials, and Life

Chemical Kinetics: Reactions in the Air We Breathe

Chemical Equilibrium: How Much Product Does a Reaction Really Make

Acid-Base and Solubility Equilibria: Reactions in Soil and Water

Metal Ions: Colorful and Essential

Thermodynamics: Spontaneous and Nonspontaneous Reactions and Processes

Electrochemistry: the Quest for Clean Energy

Biochemistry: the Compounds of Life

Nuclear Chemistry: Applications to Energy and Medicine

Life and the Periodic Table

Filters

Ethanol has the formula CH₃CH₂OH. The end carbon atom has a local molecular geometry and hybridization.

The local molecular geometry and the hybridization around each carbon atom in benzene (C₆H₆ with a hexagonal ring structure) is ________

For which one of the following molecules (BF₃, CF₄, NF₃, OF₂, XeF₄) is the electron geometry tetrahedral and the molecular geometry triangular pyramidal? Draw its Lewis structure with the correct bond angles.