Question 1

Give the approximate bond angle for a molecule with a trigonal planar shape.

Accepted Answer

A)  109.5° 
B)  180° 
C)  120° 
D)  105° 
E)  90° 
A)  109.5° 
B)  180° 
C)  120° 
D)  105° 
E)  90°

Question 2

Choose the compound below that contains at least one polar covalent bond but is nonpolar.

Accepted Answer

A)  HCN 
B)  CF4 
C)  SeBr4 
D)  ICl3 
A)  HCN 
B)  CF4 
C)  SeBr4 
D)  ICl3

Question 3

Give the electron geometry (eg), molecular geometry (mg), and hybridization for CH3-.

Accepted Answer

A)  eg = tetrahedral; mg = trigonal pyramidal; sp3 
B)  eg = tetrahedral; mg = tetrahedral; sp3 
C)  eg = trigonal pyramidal; mg = trigonal pyramidal; sp3 
D)  eg = trigonal planar; mg = trigonal planar; sp2 
A)  eg = tetrahedral; mg = trigonal pyramidal; sp3 
B)  eg = tetrahedral; mg = tetrahedral; sp3 
C)  eg = trigonal pyramidal; mg = trigonal pyramidal; sp3 
D)  eg = trigonal planar; mg = trigonal planar; sp2

Question 4

Consider the molecule below. Determine the hybridization at each of the two labelled carbons.

Accepted Answer

A)  C1 = sp3, C2 = sp3d 
B)  C1 = sp, C2 = sp2 
C)  C1 = sp2, C2 = sp3d 
D)  C1 = sp3d, C2 = sp3d2 
E)  C1 = sp2, C2 = sp3 
A)  C1 = sp3, C2 = sp3d 
B)  C1 = sp, C2 = sp2 
C)  C1 = sp2, C2 = sp3d 
D)  C1 = sp3d, C2 = sp3d2 
E)  C1 = sp2, C2 = sp3

Question 5

A molecule or ion with three electrons in bonding orbitals and two electrons in an antibonding orbital has a bond order of ________.

Accepted Answer

A)  0.5 
B)  1 
C)  1.5 
D)  2 
E)  3 
A)  0.5 
B)  1 
C)  1.5 
D)  2 
E)  3

Question 6

Draw the Lewis structure for SF6. What is the hybridization on the S atom?

Accepted Answer

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

Question 7

The orbital hybridization on the carbon atoms in C2H2  is ________.

Accepted Answer

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

Question 8

Determine the electron geometry (eg), molecular geometry (mg), and polarity of SF6.

Accepted Answer

A)  eg = trigonal bipyramidal, mg = trigonal bipyramidal, nonpolar 
B)  eg = tetrahedral, mg = tetrahedral, polar 
C)  eg = trigonal bipyramidal, mg = seesaw, polar 
D)  eg = octahedral, mg = trigonal bipyramidal, nonpolar 
E)  eg = octahedral, mg = octahedral, nonpolar 
A)  eg = trigonal bipyramidal, mg = trigonal bipyramidal, nonpolar 
B)  eg = tetrahedral, mg = tetrahedral, polar 
C)  eg = trigonal bipyramidal, mg = seesaw, polar 
D)  eg = octahedral, mg = trigonal bipyramidal, nonpolar 
E)  eg = octahedral, mg = octahedral, nonpolar

Question 9

A molecule or ion with four electrons in bonding orbitals and two electrons in an antibonding orbital has a bond order of ________.

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 10

How many of the following molecules are polar? 
PCl5 COS XeO3 SeBr2

Accepted Answer

A)  2 
B)  0 
C)  1 
D)  3 
E)  4 
A)  2 
B)  0 
C)  1 
D)  3 
E)  4

Question 11

Determine the electron geometry (eg) and molecular geometry (mg) of H2CO.

Accepted Answer

A)  eg = tetrahedral, mg = tetrahedral 
B)  eg = linear, mg = trigonal planar 
C)  eg = trigonal planar, mg = bent 
D)  eg = linear, mg = linear 
E)  eg = trigonal planar, mg = trigonal planar 
A)  eg = tetrahedral, mg = tetrahedral 
B)  eg = linear, mg = trigonal planar 
C)  eg = trigonal planar, mg = bent 
D)  eg = linear, mg = linear 
E)  eg = trigonal planar, mg = trigonal planar

Question 12

Determine the electron geometry (eg) and molecular geometry (mg) of BeCl2.

Accepted Answer

A)  eg = tetrahedral, mg = tetrahedral 
B)  eg = linear, mg = trigonal planar 
C)  eg = trigonal planar, mg = bent 
D)  eg = linear, mg = linear 
E)  eg = tetrahedral, mg = trigonal pyramidal 
A)  eg = tetrahedral, mg = tetrahedral 
B)  eg = linear, mg = trigonal planar 
C)  eg = trigonal planar, mg = bent 
D)  eg = linear, mg = linear 
E)  eg = tetrahedral, mg = trigonal pyramidal

Question 13

Place the following in order of increasing X-A-X bond angle, where A represents the central atom and X represents the outer atoms in each molecule. HCN H2O H3O⁺

Accepted Answer

A)  H3O+ 2O 
B)  H3O⁺ 2O 3O⁺ 2O 
D)  H2O 3O⁺ 
E)  H2O 3O⁺ < HCN 
A)  H3O+ 2O 
B)  H3O⁺ 2O 3O⁺ 2O 
D)  H2O 3O⁺ 
E)  H2O 3O⁺ < HCN

Question 14

Determine the molecular geometry for the molecule XeF4.

Accepted Answer

A)  Square planar 
B)  Tetrahedral 
C)  T-shaped 
D)  Square pyramidal 
E)  Trigonal planar 
A)  Square planar 
B)  Tetrahedral 
C)  T-shaped 
D)  Square pyramidal 
E)  Trigonal planar

Question 15

Draw a molecular orbital diagram and use it to determine which of the following is most stable.

Accepted Answer

A)  F2 
B)  F22⁺ 
C)  Ne22⁺ 
D)  O22⁺ 
E)  F22⁻ 
A)  F2 
B)  F22⁺ 
C)  Ne22⁺ 
D)  O22⁺ 
E)  F22⁻

Question 16

Using the VSEPR model, the molecular geometry of the central atom in PCl3 is ________.

Accepted Answer

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

Question 17

Match the following.
-BCl3

Accepted Answer

A) sp hybridized central atom 
B) octahedral electron geometry 
C) polar, but contains no polar bonds 
D) sp2 hybridized central atom 
E) linear
F)nonpolar, but contains a polar covalent bond
G)tetrahedral
H)trigonal planar
I)octahedral
J)polar
K)trigonal bipyramidal
L)seesaw molecular geometry 
A) sp hybridized central atom 
B) octahedral electron geometry 
C) polar, but contains no polar bonds 
D) sp2 hybridized central atom 
E) linear
F)nonpolar, but contains a polar covalent bond
G)tetrahedral
H)trigonal planar
I)octahedral
J)polar
K)trigonal bipyramidal
L)seesaw molecular geometry

Question 18

Determine the electron geometry for the molecule XeF4.

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 19

Which of the following statements is TRUE?

Accepted Answer

A)  Ammonia has trigonal planar electron geometry and tetrahedral molecular geometry. 
B)  Ammonia has tetrahedral electron geometry and trigonal pyramidal molecular geometry. 
C)  Ammonia has trigonal pyramidal electron geometry and tetrahedral molecular geometry. 
D)  Ammonia has trigonal planar electron geometry and trigonal bipyramidal molecular geometry. 
A)  Ammonia has trigonal planar electron geometry and tetrahedral molecular geometry. 
B)  Ammonia has tetrahedral electron geometry and trigonal pyramidal molecular geometry. 
C)  Ammonia has trigonal pyramidal electron geometry and tetrahedral molecular geometry. 
D)  Ammonia has trigonal planar electron geometry and trigonal bipyramidal molecular geometry.

Question 20

Draw the Lewis structure for the molecule C3H4. How many sigma and pi bonds does it contain?

Accepted Answer

A)  7 sigma, 1 pi 
B)  8 sigma, 0 pi 
C)  6 sigma, 2 pi 
D)  10 sigma, 0 pi 
E)  8 sigma, 2 pi 
A)  7 sigma, 1 pi 
B)  8 sigma, 0 pi 
C)  6 sigma, 2 pi 
D)  10 sigma, 0 pi 
E)  8 sigma, 2 pi

Exam 10: Chemical Bonding Ii: Molecular Shapes, Valence Bond Theory, and Molecular Orbital Theory

Give the approximate bond angle for a molecule with a trigonal planar shape.

Choose the compound below that contains at least one polar covalent bond but is nonpolar.

Give the electron geometry (eg), molecular geometry (mg), and hybridization for CH3-.

Consider the molecule below. Determine the hybridization at each of the two labelled carbons.

A molecule or ion with three electrons in bonding orbitals and two electrons in an antibonding orbital has a bond order of ________.

Draw the Lewis structure for SF6. What is the hybridization on the S atom?

The orbital hybridization on the carbon atoms in C2H2 is ________.

Determine the electron geometry (eg), molecular geometry (mg), and polarity of SF6.

A molecule or ion with four electrons in bonding orbitals and two electrons in an antibonding orbital has a bond order of ________.

How many of the following molecules are polar? PCl5 COS XeO3 SeBr2

Determine the electron geometry (eg) and molecular geometry (mg) of H2CO.

Determine the electron geometry (eg) and molecular geometry (mg) of BeCl2.

Place the following in order of increasing X-A-X bond angle, where A represents the central atom and X represents the outer atoms in each molecule. HCN H2O H3O⁺

Determine the molecular geometry for the molecule XeF4.

Draw a molecular orbital diagram and use it to determine which of the following is most stable.

Using the VSEPR model, the molecular geometry of the central atom in PCl3 is ________.

Match the following. -BCl3

Determine the electron geometry for the molecule XeF4.

Which of the following statements is TRUE?

Draw the Lewis structure for the molecule C3H4. How many sigma and pi bonds does it contain?

Units of Measurement for Physical and Chemical Change

Atoms and Elements

Molecules, Compounds, and Nomenclature

Chemical Reactions and Stoichiometry

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Liquids, Solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Gibbs Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry I: Structures

Organic Chemistry Ii: Reactions

Biochemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Transition Metals and Coordination Compounds

Filters

Give the electron geometry (eg), molecular geometry (mg), and hybridization for CH₃^-.

Draw the Lewis structure for SF₆. What is the hybridization on the S atom?

The orbital hybridization on the carbon atoms in C₂H₂ is ________.

Determine the electron geometry (eg), molecular geometry (mg), and polarity of SF₆.

How many of the following molecules are polar? PCl₅ COS XeO₃ SeBr₂

Determine the electron geometry (eg) and molecular geometry (mg) of H₂CO.

Determine the electron geometry (eg) and molecular geometry (mg) of BeCl₂.

Place the following in order of increasing X-A-X bond angle, where A represents the central atom and X represents the outer atoms in each molecule. HCN H₂O H₃O⁺

Determine the molecular geometry for the molecule XeF₄.

Using the VSEPR model, the molecular geometry of the central atom in PCl₃ is ________.

Match the following. -BCl₃

Determine the electron geometry for the molecule XeF₄.

Draw the Lewis structure for the molecule C₃H₄. How many sigma and pi bonds does it contain?