Question 1

Using the VSEPR model, what is the predicted molecular geometry of the PCl3 molecule?

Accepted Answer

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

Question 2

According to valence bond theory, the triple bond in ethyne (acetylene, C2H2) consists of

Accepted Answer

A)  three σ bonds and no   bonds. 
B)  two σ bonds and one   bond. 
C)  one σ bond and two   bonds. 
D)  no σ bonds and three   bonds. 
E)  one σ bond, one   bond, and one bond intermediate between σ and   . 
A)  three σ bonds and no   bonds. 
B)  two σ bonds and one   bond. 
C)  one σ bond and two   bonds. 
D)  no σ bonds and three   bonds. 
E)  one σ bond, one   bond, and one bond intermediate between σ and   .

Question 3

The number of lone pairs on the central atom is used to determine the ________.

Accepted Answer

The answer of The number of lone pairs on the...

Question 4

What is the bond order for the species O2−?

Accepted Answer

A)  1 
B)  1.5 
C)  2 
D)  2.5 
E)  None of these choices. 
A)  1 
B)  1.5 
C)  2 
D)  2.5 
E)  None of these choices.

Question 5

Which is the most reasonable prediction for the three F-Br-F bond angles in BrF3?

Accepted Answer

A)  90°, 90°, and 180° 
B)  86°, 94°, and 180° 
C)  86°, 86°, and 172° 
D)  94°, 94°, and 172° 
E)  120°, 120°, and 120° 
A)  90°, 90°, and 180° 
B)  86°, 94°, and 180° 
C)  86°, 86°, and 172° 
D)  94°, 94°, and 172° 
E)  120°, 120°, and 120°

Question 6

According to molecular orbital theory, what is the bond order in the O2+ ion?

Accepted Answer

A)  5.5 
B)  5 
C)  4 
D)  2.5 
E)  1.5 
A)  5.5 
B)  5 
C)  4 
D)  2.5 
E)  1.5

Question 7

According to the VSEPR model, a molecule with the general formula AB5 with no lone pairs on the central atom will have a ________ molecular geometry.

Accepted Answer

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

Question 8

How many electron domains are on the central atom for a sp3d hybridized atom?

Accepted Answer

Question 9

Which one of the following molecules is polar?

Accepted Answer

A)  PBr5 
B)  CCl4 
C)  BrF5 
D)  XeF2 
E)  XeF4 
A)  PBr5 
B)  CCl4 
C)  BrF5 
D)  XeF2 
E)  XeF4

Question 10

According to molecular orbital theory, all diatomic molecules with an even number of electrons are diamagnetic.

Accepted Answer

A) True 
 B)False

Question 11

Which one of the following molecules has a zero dipole moment?

Accepted Answer

A)  CO 
B)  CH2Cl2 
C)  SO3 
D)  SO2 
E)  NH3 
A)  CO 
B)  CH2Cl2 
C)  SO3 
D)  SO2 
E)  NH3

Question 12

How many bonds are there in one molecule of acrylonitrile (shown below)?

Accepted Answer

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

Question 13

Which is true concerning the dipole moment of a CO2 molecule?

Accepted Answer

A)  The dipole moment is zero because the C-O bond is nonpolar. 
B)  The dipole moment is zero because the molecule is linear. 
C)  The dipole moment is zero because the molecule is bent. 
D)  The dipole moment is nonzero because the molecule is linear. 
E)  The dipole moment is nonzero because the molecule is bent. 
A)  The dipole moment is zero because the C-O bond is nonpolar. 
B)  The dipole moment is zero because the molecule is linear. 
C)  The dipole moment is zero because the molecule is bent. 
D)  The dipole moment is nonzero because the molecule is linear. 
E)  The dipole moment is nonzero because the molecule is bent.

Question 14

In not more than two sentences, explain when and why chemists make use of the concept of hybridization.

Accepted Answer

Chemists postulate hybridizati

Question 15

For a homonuclear diatomic molecule, which molecular orbital is the highest in energy?

Accepted Answer

A)    
B)    
C)    
D)    
E)  All of these orbitals have the same energy. 
A)    
B)    
C)    
D)    
E)  All of these orbitals have the same energy.

Question 16

Which figure best illustrates the hybrid orbitals on iodine in ICl2-?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 17

According to the VSEPR model, the predicted molecular geometry of ammonia, NH3, 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 18

Which one of the following molecules is polar?

Accepted Answer

A)  CH4 
B)  CHBr3 
C)  F2 
D)  CBr4 
E)  CO2 
A)  CH4 
B)  CHBr3 
C)  F2 
D)  CBr4 
E)  CO2

Question 19

For a polyatomic ion having the general formula AB3n±, where A is an atom from Group 6A, B is an atom from Group 7A, and the ionic charge is n±, what charge must the ion have in order to yield a molecular geometry that is trigonal pyramidal?

Accepted Answer

A)  3- 
B)  1- 
C)  1+ 
D)  3+ 
E)  5+ 
A)  3- 
B)  1- 
C)  1+ 
D)  3+ 
E)  5+

Question 20

Which is the correct hybrid orbital diagram representing the hybridization of iodine in ICl5?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Exam 9: Chemical Bonding II: Molecular Geometry and Bonding Theories

Using the VSEPR model, what is the predicted molecular geometry of the PCl3 molecule?

According to valence bond theory, the triple bond in ethyne (acetylene, C2H2) consists of

The number of lone pairs on the central atom is used to determine the ________.

What is the bond order for the species O2−?

Which is the most reasonable prediction for the three F-Br-F bond angles in BrF3?

According to molecular orbital theory, what is the bond order in the O2+ ion?

According to the VSEPR model, a molecule with the general formula AB5 with no lone pairs on the central atom will have a ________ molecular geometry.

How many electron domains are on the central atom for a sp3d hybridized atom?

Which one of the following molecules is polar?

According to molecular orbital theory, all diatomic molecules with an even number of electrons are diamagnetic.

Which one of the following molecules has a zero dipole moment?

How many bonds are there in one molecule of acrylonitrile (shown below)?

Which is true concerning the dipole moment of a CO2 molecule?

In not more than two sentences, explain when and why chemists make use of the concept of hybridization.

For a homonuclear diatomic molecule, which molecular orbital is the highest in energy?

Which figure best illustrates the hybrid orbitals on iodine in ICl2-?

According to the VSEPR model, the predicted molecular geometry of ammonia, NH3, is

Which one of the following molecules is polar?

For a polyatomic ion having the general formula AB3n±, where A is an atom from Group 6A, B is an atom from Group 7A, and the ionic charge is n±, what charge must the ion have in order to yield a molecular geometry that is trigonal pyramidal?

Which is the correct hybrid orbital diagram representing the hybridization of iodine in ICl5?

Chemistry: the Central Science

Atoms, Molecules, and Ions

Stoichiometry: Ratios of Combination

Reactions in Aqueous Solutions

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Electron Configuration and the Periodic Table

Chemical Bonding I: Basic Concepts

Gases

Intermolecular Forces and the Physical Properties of Liquids and Solids

Modern Materials

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

Environmental Chemistry

Coordination Chemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Organic Chemistry

Filters

Using the VSEPR model, what is the predicted molecular geometry of the PCl₃ molecule?

According to valence bond theory, the triple bond in ethyne (acetylene, C₂H₂) consists of

What is the bond order for the species O₂⁻?

Which is the most reasonable prediction for the three F-Br-F bond angles in BrF₃?

According to molecular orbital theory, what is the bond order in the O₂⁺ion?

According to the VSEPR model, a molecule with the general formula AB₅ with no lone pairs on the central atom will have a ________ molecular geometry.

How many electron domains are on the central atom for a sp³^d hybridized atom?

Which is true concerning the dipole moment of a CO₂ molecule?

Which figure best illustrates the hybrid orbitals on iodine in ICl₂^-?

According to the VSEPR model, the predicted molecular geometry of ammonia, NH₃, is

For a polyatomic ion having the general formula AB₃ⁿ^±, where A is an atom from Group 6A, B is an atom from Group 7A, and the ionic charge is n±, what charge must the ion have in order to yield a molecular geometry that is trigonal pyramidal?

Which is the correct hybrid orbital diagram representing the hybridization of iodine in ICl₅?