Question 1

In molecular orbital theory the acronym HOMO stands for

Accepted Answer

A) homogenous orbital-molecular orientation. 
B) highly ordered molecular orbital. 
C) highest occupied molecular orbital. 
D) highest orbital-molecular orientation. 
E) It has no meaning. 
A) homogenous orbital-molecular orientation. 
B) highly ordered molecular orbital. 
C) highest occupied molecular orbital. 
D) highest orbital-molecular orientation. 
E) It has no meaning.

Question 2

How many of the following molecules have sp3d2 hybridization on the central atom? 
SeCl6 $\quad$XeF4 $\quad$IF5 $\quad$AsCl5

Accepted Answer

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

Question 3

List the number of sigma bonds and pi bonds in a double bond.

Accepted Answer

A) 1 sigma,1 pi 
B) 0 sigma,2 pi 
C) 2 sigma,0 pi 
D) 1 sigma,2 pi 
A) 1 sigma,1 pi 
B) 0 sigma,2 pi 
C) 2 sigma,0 pi 
D) 1 sigma,2 pi

Question 4

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 5

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 6

A molecule containing a central atom with sp hybridization has a ________ electron geometry.

Accepted Answer

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

Question 7

Determine the electron geometry for the molecule PF3.

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 8

Determine the electron geometry (eg)and molecular geometry (mg)of CH3+.

Accepted Answer

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

Question 9

Consider the molecule below.Determine the hybridization at each of the three labelled atoms.

Accepted Answer

A) 1 = sp2,2 = sp3,3 = sp2 
B) 1 = sp2,2 = sp3,3 = sp3 
C) 1 = sp3,2 = sp3,3 = sp3 
D) 1 = sp3,2 = sp3,3 = sp2 
E) 1 = sp,2 = sp2,3 = sp2 
A) 1 = sp2,2 = sp3,3 = sp2 
B) 1 = sp2,2 = sp3,3 = sp3 
C) 1 = sp3,2 = sp3,3 = sp3 
D) 1 = sp3,2 = sp3,3 = sp2 
E) 1 = sp,2 = sp2,3 = sp2

Question 10

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 11

Draw the Lewis structure for C2H2.What is the hybridization on the C atoms?

Accepted Answer

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

Question 12

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 13

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 14

Consider the molecule below.Determine the molecular geometry at each of the three labelled atoms.

Accepted Answer

A) 1 = trigonal planar,2 = tetrahedral,3 = trigonal pyramidal 
B) 1 = tetrahedral,2 = tetrahedral,3 = tetrahedral 
C) 1 = trigonal planar,2 = tetrahedral,3 = tetrahedral 
D) 1 = tetrahedral,2 = tetrahedral,3 = trigonal planar 
E) 1 = trigonal planar,2 = trigonal pyramidal,3 = trigonal pyramidal 
A) 1 = trigonal planar,2 = tetrahedral,3 = trigonal pyramidal 
B) 1 = tetrahedral,2 = tetrahedral,3 = tetrahedral 
C) 1 = trigonal planar,2 = tetrahedral,3 = tetrahedral 
D) 1 = tetrahedral,2 = tetrahedral,3 = trigonal planar 
E) 1 = trigonal planar,2 = trigonal pyramidal,3 = trigonal pyramidal

Question 15

Determine the electron geometry (eg)and molecular geometry (mg)of XeF4.

Accepted Answer

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

Question 16

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 17

Determine the electron geometry (eg),molecular geometry (mg),and polarity of TeCl6.

Accepted Answer

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

Question 18

The hybrid orbital set used by the central atom in NO3- is ________.

Accepted Answer

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

Question 19

Place the following in order of decreasing X-A-X bond angle,where A represents the central atom and X represents the outer atoms in each molecule. 
$\quad$CS2 $\quad$CF4 $\quad$SCl2

Accepted Answer

A) CS2 > SCl2 > CF4 
B) SCl2 > CF4 > CS2 
C) CF4 > SCl2 > CS2 
D) CS2 > CF4 > SCl2 
E) CF4 > CS2 > SCl2 
A) CS2 > SCl2 > CF4 
B) SCl2 > CF4 > CS2 
C) CF4 > SCl2 > CS2 
D) CS2 > CF4 > SCl2 
E) CF4 > CS2 > SCl2

Question 20

Use the molecular orbital diagram shown to determine which of the following is most stable.

Accepted Answer

A) C22+ 
B) N22+ 
C) B2 
D) C22- 
E) B22+ 
A) C22+ 
B) N22+ 
C) B2 
D) C22- 
E) B22+

Exam 10: Chemical Bonding II: Molecular Shapes, valence Bond Theory, and Molecular Orbital Theory

In molecular orbital theory the acronym HOMO stands for

How many of the following molecules have sp3d2 hybridization on the central atom? SeCl6 \quad XeF4 \quad IF5 \quad AsCl5

List the number of sigma bonds and pi bonds in a double bond.

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

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

A molecule containing a central atom with sp hybridization has a ________ electron geometry.

Determine the electron geometry for the molecule PF3.

Determine the electron geometry (eg)and molecular geometry (mg)of CH3+.

Consider the molecule below.Determine the hybridization at each of the three labelled atoms.

Determine the molecular geometry for the molecule XeF4.

Draw the Lewis structure for C2H2.What is the hybridization on the C atoms?

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

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

Consider the molecule below.Determine the molecular geometry at each of the three labelled atoms.

Determine the electron geometry (eg)and molecular geometry (mg)of XeF4.

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

Determine the electron geometry (eg),molecular geometry (mg),and polarity of TeCl6.

The hybrid orbital set used by the central atom in NO3- is ________.

Place the following in order of decreasing X-A-X bond angle,where A represents the central atom and X represents the outer atoms in each molecule. \quad CS2 \quad CF4 \quad SCl2

Use the molecular orbital diagram shown to determine which of the following is most stable.

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

How many of the following molecules have sp³^d² hybridization on the central atom? SeCl₆ $\quad$ XeF₄ $\quad$ IF₅ $\quad$ AsCl₅

Determine the electron geometry for the molecule PF₃.

Determine the electron geometry (eg)and molecular geometry (mg)of CH₃⁺.

Determine the molecular geometry for the molecule XeF₄.

Draw the Lewis structure for C₂H₂.What is the hybridization on the C atoms?

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

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

Determine the electron geometry (eg)and molecular geometry (mg)of XeF₄.

Determine the electron geometry (eg),molecular geometry (mg),and polarity of TeCl₆.

The hybrid orbital set used by the central atom in NO₃^- is ________.

Place the following in order of decreasing X-A-X bond angle,where A represents the central atom and X represents the outer atoms in each molecule. $\quad$ CS₂ $\quad$ CF₄ $\quad$ SCl₂