Question 1

According to the VSEPR theory, the molecular geometry of boron trichloride is

Accepted Answer

A)  linear. 
B)  trigonal planar. 
C)  bent. 
D)  tetrahedral. 
E)  trigonal pyramidal. 
A)  linear. 
B)  trigonal planar. 
C)  bent. 
D)  tetrahedral. 
E)  trigonal pyramidal.

Question 2

The electrons in the delocalized molecular orbitals of benzene (C6H6)

Accepted Answer

A)  are confined between two adjacent bonding atoms. 
B)  are free to move around the six-membered ring. 
C)  form the electron pairs in the C-H bonds of the compound. 
D)  are unevenly distributed through the molecule. 
E)  are responsible for the fact that the bonds between three pairs of carbon atoms in the ring are longer and stronger than the bonds between the other three pairs of carbon atoms. 
A)  are confined between two adjacent bonding atoms. 
B)  are free to move around the six-membered ring. 
C)  form the electron pairs in the C-H bonds of the compound. 
D)  are unevenly distributed through the molecule. 
E)  are responsible for the fact that the bonds between three pairs of carbon atoms in the ring are longer and stronger than the bonds between the other three pairs of carbon atoms.

Question 3

The number of pi bonds in the molecule below is

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  5 
E)  9 
A)  1 
B)  2 
C)  3 
D)  5 
E)  9

Question 4

Give the number of lone pairs around the central atom and the molecular geometry of XeF4.

Accepted Answer

A)  0 lone pairs, tetrahedral 
B)  1 lone pair, distorted tetrahedron (seesaw) 
C)  1 lone pair, square pyramidal 
D)  1 lone pair, tetrahedral 
E)  2 lone pairs, square planar 
A)  0 lone pairs, tetrahedral 
B)  1 lone pair, distorted tetrahedron (seesaw) 
C)  1 lone pair, square pyramidal 
D)  1 lone pair, tetrahedral 
E)  2 lone pairs, square planar

Question 5

The C-N-O bond angle in nitromethane, CH3NO2, is expected to be approximately

Accepted Answer

A)  60$\circ$. 
B)  90$\circ$. 
C)  109.5$\circ$. 
D)  120$\circ$. 
E)  180$\circ$. 
A)  60$\circ$. 
B)  90$\circ$. 
C)  109.5$\circ$. 
D)  120$\circ$. 
E)  180$\circ$.

Question 6

According to Valence Bond Theory which orbital is left vacant in the molecule BF3

Accepted Answer

A)  sp3 
B)  sp2 
C)  sp 
D)  p 
E)  s 
A)  sp3 
B)  sp2 
C)  sp 
D)  p 
E)  s

Question 7

Predict the geometry around the central atom in PO43-.

Accepted Answer

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

Question 8

According to Molecular Orbital Theory, two separate px orbitals interact about the x-axis to form what molecular orbitals

Accepted Answer

A)  $\sigma$ and $\sigma$* 
B)  $\pi$ and $\pi$* 
C)  $\sigma$, $\sigma$* and $\pi$ 
D)  $\pi$, $\pi$*, and $\sigma$ 
E)  $\sigma$, $\sigma$*, $\pi$, and $\pi$* 
A)  $\sigma$ and $\sigma$* 
B)  $\pi$ and $\pi$* 
C)  $\sigma$, $\sigma$* and $\pi$ 
D)  $\pi$, $\pi$*, and $\sigma$ 
E)  $\sigma$, $\sigma$*, $\pi$, and $\pi$*

Question 9

According to Valence Bond Theory, which orbital is left vacant in the molecule BH3

Accepted Answer

A)  sp3 
B)  sp2 
C)  sp 
D)  p 
E)  s 
A)  sp3 
B)  sp2 
C)  sp 
D)  p 
E)  s

Question 10

Which of the following species has the largest dipole moment (i.e., is the most polar)

Accepted Answer

A)  CH4 
B)  CH3Br 
C)  CH3Cl 
D)  CH3F 
E)  CH3I 
A)  CH4 
B)  CH3Br 
C)  CH3Cl 
D)  CH3F 
E)  CH3I

Question 11

Which of the following correctly lists species in order of increasing bond length

Accepted Answer

A)  C2- 2 2+ 
B)  C2 2+ 2- 
C)  C2- 2+ 2 
D)  C2+ 2 2- 
E)  C2+ 2- 2 
A)  C2- 2 2+ 
B)  C2 2+ 2- 
C)  C2- 2+ 2 
D)  C2+ 2 2- 
E)  C2+ 2- 2

Question 12

The geometry of the hybrid orbitals about a central atom with sp2 hybridization is:

Accepted Answer

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

Question 13

Give the number of lone pairs around the central atom and the geometry of the ion ClO2-.

Accepted Answer

A)  0 lone pairs, linear 
B)  1 lone pair, bent 
C)  2 lone pairs, bent 
D)  3 lone pairs, bent 
E)  3 lone pairs, linear 
A)  0 lone pairs, linear 
B)  1 lone pair, bent 
C)  2 lone pairs, bent 
D)  3 lone pairs, bent 
E)  3 lone pairs, linear

Question 14

What bond angles are predicted by VSEPR theory for the F -P -F bonds in PF5

Accepted Answer

A)  90$\circ$, 120$\circ$ 
B)  120$\circ$, 180$\circ$ 
C)  90$\circ$, 120$\circ$, and 180$\circ$ 
D)  60$\circ$, 120$\circ$, and 180$\circ$ 
E) None of the above 
A)  90$\circ$, 120$\circ$ 
B)  120$\circ$, 180$\circ$ 
C)  90$\circ$, 120$\circ$, and 180$\circ$ 
D)  60$\circ$, 120$\circ$, and 180$\circ$ 
E) None of the above

Question 15

A molecule with 5 single bonds (and any number of lone pairs) could have which type of molecular geometry
I. Trigonal bipyramidal
II. Seesaw
III. T-shaped
IV. Square pyramidal

Accepted Answer

A)  I and II 
B)  I, III, and IV 
C)  II and III 
D)  I and IV 
E)  I, II, III, and IV 
A)  I and II 
B)  I, III, and IV 
C)  II and III 
D)  I and IV 
E)  I, II, III, and IV

Question 16

What is the hybridization of the As atom in the AsF5 molecule

Accepted Answer

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

Question 17

Two px orbitals from two different atoms can interact to form a sigma bonding molecular orbital.

Accepted Answer

A) True 
 B)False

Question 18

A sp3 hybridized central nitrogen atom with 1 lone pair of electrons has what type of bonding

Accepted Answer

A)  1 $\pi$ and 2 $\sigma$ bonds 
B)  2 $\pi$ and 3 $\sigma$ bonds 
C)  1 $\pi$ and 3 $\sigma$ bonds 
D)  0 $\pi$ and 3 $\sigma$ bonds 
E)  0 $\pi$ and 4 $\sigma$ bonds 
A)  1 $\pi$ and 2 $\sigma$ bonds 
B)  2 $\pi$ and 3 $\sigma$ bonds 
C)  1 $\pi$ and 3 $\sigma$ bonds 
D)  0 $\pi$ and 3 $\sigma$ bonds 
E)  0 $\pi$ and 4 $\sigma$ bonds

Question 19

Which of the following molecules is polar
CH3OH
H2O
CH3OCH3

Accepted Answer

A)  CH3OH 
B)  H2O 
C)  CH3OCH3 
D) All of the above 
E) None of the above 
A)  CH3OH 
B)  H2O 
C)  CH3OCH3 
D) All of the above 
E) None of the above

Question 20

Which of the following molecules have the same geometries

Accepted Answer

A)  SF4 and CH4 
B)  CO2 and H2O 
C)  CO2 and BeH2 
D)  N2O and NO2 
A)  SF4 and CH4 
B)  CO2 and H2O 
C)  CO2 and BeH2 
D)  N2O and NO2

Exam 10: Chemical Bonding II: Molecular Geometry and Hybridization of Atomic

According to the VSEPR theory, the molecular geometry of boron trichloride is

The electrons in the delocalized molecular orbitals of benzene (C6H6)

The number of pi bonds in the molecule below is

Give the number of lone pairs around the central atom and the molecular geometry of XeF4.

The C-N-O bond angle in nitromethane, CH3NO2, is expected to be approximately

According to Valence Bond Theory which orbital is left vacant in the molecule BF3

Predict the geometry around the central atom in PO43-.

According to Molecular Orbital Theory, two separate px orbitals interact about the x-axis to form what molecular orbitals

According to Valence Bond Theory, which orbital is left vacant in the molecule BH3

Which of the following species has the largest dipole moment (i.e., is the most polar)

Which of the following correctly lists species in order of increasing bond length

The geometry of the hybrid orbitals about a central atom with sp2 hybridization is:

Give the number of lone pairs around the central atom and the geometry of the ion ClO2-.

What bond angles are predicted by VSEPR theory for the F -P -F bonds in PF5

A molecule with 5 single bonds (and any number of lone pairs) could have which type of molecular geometry I. Trigonal bipyramidal II. Seesaw III. T-shaped IV. Square pyramidal

What is the hybridization of the As atom in the AsF5 molecule

Two px orbitals from two different atoms can interact to form a sigma bonding molecular orbital.

A sp3 hybridized central nitrogen atom with 1 lone pair of electrons has what type of bonding

Which of the following molecules is polar CH3OH H2O CH3OCH3

Which of the following molecules have the same geometries

Chemistry: The Study of Change

Atoms Molecules and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solutions

Gases

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding I: Basic Concepts

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy Free Energy and Equilibrium

Electrochemistry

Nuclear Chemistry

Chemistry in the Atmosphere

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metals Chemistry and Coordination Compounds

Organic Chemistry

Synthetic and Natural Organic Polymers

Filters

The electrons in the delocalized molecular orbitals of benzene (C₆H₆)

Give the number of lone pairs around the central atom and the molecular geometry of XeF₄.

The C-N-O bond angle in nitromethane, CH₃NO₂, is expected to be approximately

According to Valence Bond Theory which orbital is left vacant in the molecule BF₃

Predict the geometry around the central atom in PO₄^3-.

According to Molecular Orbital Theory, two separate p_x orbitals interact about the x-axis to form what molecular orbitals

According to Valence Bond Theory, which orbital is left vacant in the molecule BH₃

The geometry of the hybrid orbitals about a central atom with sp² hybridization is:

Give the number of lone pairs around the central atom and the geometry of the ion ClO₂^-.

What bond angles are predicted by VSEPR theory for the F -P -F bonds in PF₅

What is the hybridization of the As atom in the AsF₅ molecule

Two p_x orbitals from two different atoms can interact to form a sigma bonding molecular orbital.

A sp³ hybridized central nitrogen atom with 1 lone pair of electrons has what type of bonding

Which of the following molecules is polar CH₃OH H₂O CH₃OCH₃