Question 1

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

Accepted Answer

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

Question 2

A molecule or ion with seven 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) 2.5 
A) 0.5 
B) 1 
C) 1.5 
D) 2 
E) 2.5

Question 3

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

Accepted Answer

A) C1 = tetrahedral,C2 = linear 
B) C1 = trigonal planar,C2 = bent 
C) C1 = bent,C2 = trigonal planar 
D) C1 = trigonal planar,C2 = tetrahedral 
E) C1 = trigonal pyramidal,C2 = seesaw 
A) C1 = tetrahedral,C2 = linear 
B) C1 = trigonal planar,C2 = bent 
C) C1 = bent,C2 = trigonal planar 
D) C1 = trigonal planar,C2 = tetrahedral 
E) C1 = trigonal pyramidal,C2 = seesaw

Question 4

Determine the electron geometry (eg),molecular geometry (mg),and polarity of HBrO2.

Accepted Answer

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

Question 5

Which of the following best describes ClF2-? It has a molecular geometry that is

Accepted Answer

A) linear with no lone pairs on the Cl atom. 
B) linear with lone pairs on the Cl atom. 
C) nonlinear with no lone pairs on the Cl atom. 
D) nonlinear with lone pairs on the Cl atom. 
A) linear with no lone pairs on the Cl atom. 
B) linear with lone pairs on the Cl atom. 
C) nonlinear with no lone pairs on the Cl atom. 
D) nonlinear with lone pairs on the Cl atom.

Question 6

Draw the Lewis structure for the molecule CH2CHCH3.How many sigma and pi bonds does it contain?

Accepted Answer

A) 8 sigma,1 pi 
B) 9 sigma,0 pi 
C) 9 sigma,1 pi 
D) 7 sigma,2 pi 
E) 8 sigma,2 pi 
A) 8 sigma,1 pi 
B) 9 sigma,0 pi 
C) 9 sigma,1 pi 
D) 7 sigma,2 pi 
E) 8 sigma,2 pi

Question 7

How many of the following molecules have sp3d hybridization on the central atom? 
SiCl4 $\quad$BrF5 $\quad$AsF5$\quad$ BrF3

Accepted Answer

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

Question 8

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

Accepted Answer

A) O22- 
B) Ne22+ 
C) O22+ 
D) F22+ 
E) None of the above is paramagnetic. 
A) O22- 
B) Ne22+ 
C) O22+ 
D) F22+ 
E) None of the above is paramagnetic.

Question 9

Place the following in order of increasing X-Se-X bond angle,where X represents the outer atoms in each molecule. 
SeO2$\quad$SeCl6 $\quad$SeF2

Accepted Answer

A) SeCl6 2 2 
B) SeF2 2 6 
C) SeF2 6 2 
D) SeO2 2 6 
E) SeCl6 2 2 
A) SeCl6 2 2 
B) SeF2 2 6 
C) SeF2 6 2 
D) SeO2 2 6 
E) SeCl6 2 2

Question 10

Draw the Lewis structure for CO2.What is the hybridization on the C atom?

Accepted Answer

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

Question 11

A molecule containing a central atom with six electron groups has a(n)________ electron geometry.

Accepted Answer

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

Question 12

Using the VSEPR model,the molecular geometry of the central atom in CCl4 is ________.

Accepted Answer

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

Question 13

Describe a sigma bond.

Accepted Answer

A) p orbital overlapping with a d orbital 
B) an attraction due to overlap of two orbitals along the internuclear axis 
C) side by side overlap of d orbitals 
D) overlap of two d orbitals 
E) s orbital overlapping with the side of a p orbital 
A) p orbital overlapping with a d orbital 
B) an attraction due to overlap of two orbitals along the internuclear axis 
C) side by side overlap of d orbitals 
D) overlap of two d orbitals 
E) s orbital overlapping with the side of a p orbital

Question 14

How many of the following molecules have sp hybridization on the central atom? 
C2Cl2 $\quad$CO2 $\quad$O3 $\quad$H2O

Accepted Answer

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

Question 15

What is the molecular geometry of ClF4 -?

Accepted Answer

A) seesaw 
B) square planar 
C) square pyramidal 
D) tetrahedral 
A) seesaw 
B) square planar 
C) square pyramidal 
D) tetrahedral

Question 16

In molecular orbital theory the acronym LCAO stands for

Accepted Answer

A) linear combination of atomic orbitals. 
B) lowest combined atomic orbitals. 
C) least consumed advanced orientation. 
D) linearly created available orbital. 
E) It has no meaning. 
A) linear combination of atomic orbitals. 
B) lowest combined atomic orbitals. 
C) least consumed advanced orientation. 
D) linearly created available orbital. 
E) It has no meaning.

Question 17

Give the electron geometry,molecular geometry,and hybridization for both carbons in CH3COOH.

Accepted Answer

eg = tetrahedral; mg

Question 18

Identify the number of electron groups around a molecule with sp hybridization.

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 19

Is it possible for a molecule to be nonpolar even though it contains polar bonds? Explain your answer and give an example.

Accepted Answer

Yes.The polarity of a molecule depends o

Question 20

Give the approximate bond angle for a molecule with octahedral electron geometry and square pyramidal molecular geometry.

Accepted Answer

A) 90° 
B) 180° 
C) >120° 
D) 90° 
A) 90° 
B) 180° 
C) >120° 
D) 90°

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

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

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

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

Determine the electron geometry (eg),molecular geometry (mg),and polarity of HBrO2.

Which of the following best describes ClF2-? It has a molecular geometry that is

Draw the Lewis structure for the molecule CH2CHCH3.How many sigma and pi bonds does it contain?

How many of the following molecules have sp3d hybridization on the central atom? SiCl4 \quad BrF5 \quad AsF5 \quad BrF3

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

Place the following in order of increasing X-Se-X bond angle,where X represents the outer atoms in each molecule. SeO2 \quad SeCl6 \quad SeF2

Draw the Lewis structure for CO2.What is the hybridization on the C atom?

A molecule containing a central atom with six electron groups has a(n)________ electron geometry.

Using the VSEPR model,the molecular geometry of the central atom in CCl4 is ________.

Describe a sigma bond.

How many of the following molecules have sp hybridization on the central atom? C2Cl2 \quad CO2 \quad O3 \quad H2O

What is the molecular geometry of ClF4 -?

In molecular orbital theory the acronym LCAO stands for

Give the electron geometry,molecular geometry,and hybridization for both carbons in CH3COOH.

Identify the number of electron groups around a molecule with sp hybridization.

Is it possible for a molecule to be nonpolar even though it contains polar bonds? Explain your answer and give an example.

Give the approximate bond angle for a molecule with octahedral electron geometry and square pyramidal molecular geometry.

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

Determine the electron geometry (eg),molecular geometry (mg),and polarity of HBrO₂.

Which of the following best describes ClF₂^-? It has a molecular geometry that is

Draw the Lewis structure for the molecule CH₂CHCH₃.How many sigma and pi bonds does it contain?

How many of the following molecules have sp³^d hybridization on the central atom? SiCl₄ $\quad$ BrF₅ $\quad$ AsF₅ $\quad$ BrF₃

Place the following in order of increasing X-Se-X bond angle,where X represents the outer atoms in each molecule. SeO₂ $\quad$ SeCl_{6 $\quad$}SeF₂

Draw the Lewis structure for CO₂.What is the hybridization on the C atom?

Using the VSEPR model,the molecular geometry of the central atom in CCl₄ is ________.

How many of the following molecules have sp hybridization on the central atom? C₂Cl₂ $\quad$ CO₂ $\quad$ O₃ $\quad$ H₂O

What is the molecular geometry of ClF₄ ^-?

Give the electron geometry,molecular geometry,and hybridization for both carbons in CH₃COOH.