Question 1

Of the following molecules (O3, SCl2, SO2, CS2, and CO2), which ones do you predict to have a bond angle of 180°?

Accepted Answer

Question 2

Both ethane (C2H6) and ethylene (C2H4) have two carbon atoms. In a valence bond picture of the C-C bonds, ________ hybrid orbitals overlap for ethane and ________ hybrid orbitals overlap for ethylene.

Accepted Answer

A)  sp; sp 
B)  sp; sp2 
C)  sp2; sp3 
D)  sp3; sp2 
E)  sp2; sp 
A)  sp; sp 
B)  sp; sp2 
C)  sp2; sp3 
D)  sp3; sp2 
E)  sp2; sp

Question 3

Which electron-pair geometry corresponds to a steric number of 2?

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 4

What are the hybridizations of the carbon atoms in CH3CH2(CO)H, in order from left to right? Note that the   bond is a double bond.

Accepted Answer

A)  sp3, sp3, sp2 
B)  sp3, sp3, sp3 
C)  sp3, sp2, sp3 
D)  sp2, sp2, sp3 
E)  sp3, sp2, sp2 
A)  sp3, sp3, sp2 
B)  sp3, sp3, sp3 
C)  sp3, sp2, sp3 
D)  sp2, sp2, sp3 
E)  sp3, sp2, sp2

Question 5

Which type of molecular orbital has only one nodal plane, which contains the atomic nuclei?

Accepted Answer

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

Question 6

Which of the following statements about bonds between two carbon atoms is/are correct?
(I) Bond strength increases as more electrons are shared between the atoms.
(II) Bond strength increases as the overlap between atomic orbitals increases.
(III) Hybrid orbitals are used to describe (account for) the geometry (bond angles) around each carbon atom.

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  Only two of these are correct statements. 
E)  All three are correct statements. 
A)  I 
B)  II 
C)  III 
D)  Only two of these are correct statements. 
E)  All three are correct statements.

Question 7

Which of the following molecules or ions has a trigonal pyramid shape?

Accepted Answer

A)  KrF4 
B)  COCl2 
C)  SeO32- 
D)  NH4+ 
E)  O3 
A)  KrF4 
B)  COCl2 
C)  SeO32- 
D)  NH4+ 
E)  O3

Question 8

Which electron-pair geometry has the lowest electron-electron repulsive forces?

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 9

For the molecule CH3CHCHCH3, the local molecular geometry around a carbon atom at the end and its hybridization are ________

Accepted Answer

A)  trigonal bipyramid and sp. 
B)  trigonal planar and sp3. 
C)  trigonal planar and sp2. 
D)  tetrahedral and sp3. 
E)  linear and sp. 
A)  trigonal bipyramid and sp. 
B)  trigonal planar and sp3. 
C)  trigonal planar and sp2. 
D)  tetrahedral and sp3. 
E)  linear and sp.

Question 10

The local molecular geometry around carbon atom 2 (second from the left) and its hybridization are ________

Accepted Answer

A)  trigonal bipyramid and sp. 
B)  trigonal planar and sp3. 
C)  trigonal planar and sp2. 
D)  tetrahedral and sp3. 
E)  linear and sp. 
A)  trigonal bipyramid and sp. 
B)  trigonal planar and sp3. 
C)  trigonal planar and sp2. 
D)  tetrahedral and sp3. 
E)  linear and sp.

Question 11

Identify the molecular geometry of the molecular anion, SF5-, and the hybridization of the S atomic orbitals.

Accepted Answer

Square pyr

Question 12

Which bond is the most polar?

Accepted Answer

A)  H-C 
B)  H-N 
C)  H-O 
D)  H-Cl 
E)  H-F 
A)  H-C 
B)  H-N 
C)  H-O 
D)  H-Cl 
E)  H-F

Question 13

In 1995 a Japanese cult attacked the Tokyo subway system with the nerve gas sarin, which focused world attention on the dangers of chemical warfare agents. The connectivity of atoms in the sarin molecule is shown below. Complete the Lewis structure by adding bonds and lone pairs as necessary. Assign formal charges to the P and O atoms, and determine the local molecular geometry around the central oxygen atom.

Accepted Answer

@#IMG-DLM& The formal charges are all 0.

Question 14

Which of the following has a local molecular geometry about a carbon atom that is trigonal planar?

Accepted Answer

A)  CH3CH2OH 
B)  CH3OH 
C)  C2H4 
D)  CH3OCH3 
E)  C2H2 
A)  CH3CH2OH 
B)  CH3OH 
C)  C2H4 
D)  CH3OCH3 
E)  C2H2

Question 15

Which of the following compounds has the same geometry as SO2?

Accepted Answer

A)  H2O 
B)  HCN 
C)  ICl3 
D)  OCS 
E)  CO2 
A)  H2O 
B)  HCN 
C)  ICl3 
D)  OCS 
E)  CO2

Question 16

Which statement about sigma ($\sigma$) and pi ( $\pi$) bonds is not correct?

Accepted Answer

A)  A sigma bond has the region of high electron density aligned along the bond axis, which is the line connecting the two atoms. 
B)  A pi bond has regions of high electron density lying above and below the bond axis, which is the line connecting the two atoms. 
C)  A pi bond commonly is formed from the overlap of two unhybridized atomic 2p orbitals. 
D)  In the trigonal planar geometry, the sigma bonds are formed from the overlap of an sp2 hybridized orbital with another orbital. 
E)  The molecule acetylene, C2H2, has five sigma bonds and one pi bond. 
A)  A sigma bond has the region of high electron density aligned along the bond axis, which is the line connecting the two atoms. 
B)  A pi bond has regions of high electron density lying above and below the bond axis, which is the line connecting the two atoms. 
C)  A pi bond commonly is formed from the overlap of two unhybridized atomic 2p orbitals. 
D)  In the trigonal planar geometry, the sigma bonds are formed from the overlap of an sp2 hybridized orbital with another orbital. 
E)  The molecule acetylene, C2H2, has five sigma bonds and one pi bond.

Question 17

Which one of the following molecules has a bond order of 3?

Accepted Answer

A)  Li2 
B)  Be2 
C)  N2 
D)  F2 
E)  C2 
A)  Li2 
B)  Be2 
C)  N2 
D)  F2 
E)  C2

Question 18

Which type of molecular orbital has maximum electron density above and below the internuclear axis but zero density in a plane perpendicular to the internuclear axis?

Accepted Answer

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

Question 19

What hybridization is needed to describe the square planar molecular geometry of KrF4?

Accepted Answer

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

Question 20

Which one of the statements A-D about electron-pair geometry and molecular geometry is not correct?

Accepted Answer

A)  The electron-pair geometry identifies the relative positions of the bonding regions of electrons and the lone pairs of electrons around a central atom in a molecule. 
B)  The molecular geometry identifies the relative positions of the atoms around a central atom in a molecule. 
C)  If there are no lone pairs, then the electron-pair geometry and the molecular geometry are the same. 
D)  The molecular geometry differs from the electron-pair geometry when the number of atoms around the central atom is smaller than the number of regions of electron density. 
E)  Statements A-D are all correct. 
A)  The electron-pair geometry identifies the relative positions of the bonding regions of electrons and the lone pairs of electrons around a central atom in a molecule. 
B)  The molecular geometry identifies the relative positions of the atoms around a central atom in a molecule. 
C)  If there are no lone pairs, then the electron-pair geometry and the molecular geometry are the same. 
D)  The molecular geometry differs from the electron-pair geometry when the number of atoms around the central atom is smaller than the number of regions of electron density. 
E)  Statements A-D are all correct.

Of the following molecules (O₃, SCl₂, SO₂, CS₂, and CO₂), which ones do you predict to have a bond angle of 180°?

Both ethane (C₂H₆) and ethylene (C₂H₄) have two carbon atoms. In a valence bond picture of the C-C bonds, hybrid orbitals overlap for ethane and hybrid orbitals overlap for ethylene.

Which electron-pair geometry corresponds to a steric number of 2?

What are the hybridizations of the carbon atoms in CH₃CH₂(CO)H, in order from left to right? Note that the bond is a double bond.

Which type of molecular orbital has only one nodal plane, which contains the atomic nuclei?

Which of the following molecules or ions has a trigonal pyramid shape?

Which electron-pair geometry has the lowest electron-electron repulsive forces?

For the molecule CH₃CHCHCH₃, the local molecular geometry around a carbon atom at the end and its hybridization are ________

The local molecular geometry around carbon atom 2 (second from the left) and its hybridization are ________

Identify the molecular geometry of the molecular anion, SF₅^-, and the hybridization of the S atomic orbitals.

Which bond is the most polar?

Which of the following has a local molecular geometry about a carbon atom that is trigonal planar?

Which of the following compounds has the same geometry as SO₂?

Which statement about sigma ( $\sigma$ ) and pi ( $\pi$ ) bonds is not correct?

Which one of the following molecules has a bond order of 3?

Which type of molecular orbital has maximum electron density above and below the internuclear axis but zero density in a plane perpendicular to the internuclear axis?

What hybridization is needed to describe the square planar molecular geometry of KrF₄?

Which one of the statements A-D about electron-pair geometry and molecular geometry 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

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Exam 9: Molecular Geometry: Shape Determines Function

Of the following molecules (O3, SCl2, SO2, CS2, and CO2), which ones do you predict to have a bond angle of 180°?

Both ethane (C2H6) and ethylene (C2H4) have two carbon atoms. In a valence bond picture of the C-C bonds, ________ hybrid orbitals overlap for ethane and ________ hybrid orbitals overlap for ethylene.

Which electron-pair geometry corresponds to a steric number of 2?

What are the hybridizations of the carbon atoms in CH3CH2(CO)H, in order from left to right? Note that the bond is a double bond.

Which type of molecular orbital has only one nodal plane, which contains the atomic nuclei?

Which of the following molecules or ions has a trigonal pyramid shape?

Which electron-pair geometry has the lowest electron-electron repulsive forces?

For the molecule CH3CHCHCH3, the local molecular geometry around a carbon atom at the end and its hybridization are ________

The local molecular geometry around carbon atom 2 (second from the left) and its hybridization are ________

Identify the molecular geometry of the molecular anion, SF5-, and the hybridization of the S atomic orbitals.

Which bond is the most polar?

Which of the following has a local molecular geometry about a carbon atom that is trigonal planar?

Which of the following compounds has the same geometry as SO2?

Which statement about sigma ( σ\sigmaσ ) and pi ( π\piπ ) bonds is not correct?

Which one of the following molecules has a bond order of 3?

Which type of molecular orbital has maximum electron density above and below the internuclear axis but zero density in a plane perpendicular to the internuclear axis?

What hybridization is needed to describe the square planar molecular geometry of KrF4?

Which one of the statements A-D about electron-pair geometry and molecular geometry 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

Of the following molecules (O₃, SCl₂, SO₂, CS₂, and CO₂), which ones do you predict to have a bond angle of 180°?

Both ethane (C₂H₆) and ethylene (C₂H₄) have two carbon atoms. In a valence bond picture of the C-C bonds, hybrid orbitals overlap for ethane and hybrid orbitals overlap for ethylene.

What are the hybridizations of the carbon atoms in CH₃CH₂(CO)H, in order from left to right? Note that the bond is a double bond.

For the molecule CH₃CHCHCH₃, the local molecular geometry around a carbon atom at the end and its hybridization are ________

Identify the molecular geometry of the molecular anion, SF₅^-, and the hybridization of the S atomic orbitals.

Which of the following compounds has the same geometry as SO₂?

Which statement about sigma ( $\sigma$ ) and pi ( $\pi$ ) bonds is not correct?

What hybridization is needed to describe the square planar molecular geometry of KrF₄?