Question 1

What is the O-B-O bond angle in BO33-?

Accepted Answer

A) less than 109.5° 
B) 109.5° 
C) 120° 
D) greater than 120° 
A) less than 109.5° 
B) 109.5° 
C) 120° 
D) greater than 120° C

Question 2

Which statement is INCORRECT?

Accepted Answer

A) The bond length is the internuclear distance. 
B) The covalent bond is a region of high electron charge density between two atoms. 
C) Hybrid orbitals are combinations of atomic orbitals. 
D) There are the same number of hybrid orbitals produced as the number of atomic orbitals combined. 
E) An sp hybridization produces a tetrahedral molecule. 
A) The bond length is the internuclear distance. 
B) The covalent bond is a region of high electron charge density between two atoms. 
C) Hybrid orbitals are combinations of atomic orbitals. 
D) There are the same number of hybrid orbitals produced as the number of atomic orbitals combined. 
E) An sp hybridization produces a tetrahedral molecule. E

Question 3

Using the VSEPR model,the molecular geometry of the central atom in H2Se is:

Accepted Answer

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

Question 4

What are the ideal bond angles for H2O?

Accepted Answer

A) 120° 
B) 109.5° 
C) 90° 
D) 180° 
E) 75° 
A) 120° 
B) 109.5° 
C) 90° 
D) 180° 
E) 75°

Question 5

Which of the following statements concerning the carbon dioxide molecule is correct?

Accepted Answer

A) The molecule contains two lone pairs of valence electrons. 
B) The molecule contains two σ bonds. 
C) The molecule contains four π bonds. 
D) The carbon is described by sp2 hybridization. 
E) Each oxygen is described by sp3 hybridization. 
A) The molecule contains two lone pairs of valence electrons. 
B) The molecule contains two σ bonds. 
C) The molecule contains four π bonds. 
D) The carbon is described by sp2 hybridization. 
E) Each oxygen is described by sp3 hybridization.

Question 6

Choose the INCORRECT statement about CO2.

Accepted Answer

A) There are two π bonds. 
B) There are two σ bonds. 
C) C has one lone pair. 
D) The hybridization on C is sp. 
E) The molecule is linear. 
A) There are two π bonds. 
B) There are two σ bonds. 
C) C has one lone pair. 
D) The hybridization on C is sp. 
E) The molecule is linear.

Question 7

The valence-bond method describes covalent bonding as the overlap of partially filled orbitals.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following species is paramagnetic?

Accepted Answer

A) B2 
B) C2 
C) N2 
D) CO 
A) B2 
B) C2 
C) N2 
D) CO

Question 9

Choose the INCORRECT statement about NO2+.

Accepted Answer

A) There is one π bond. 
B) There are two σ bonds. 
C) The hybridization is sp. 
D) There are no lone pairs on N. 
E) There are two lone pairs on each O. 
A) There is one π bond. 
B) There are two σ bonds. 
C) The hybridization is sp. 
D) There are no lone pairs on N. 
E) There are two lone pairs on each O.

Question 10

Which of the following carbon molecules has sp hybridization?

Accepted Answer

A) CH4  
B) C2H2  
C) Cl2CS 
D) CH3- 
E) CO2 
A) CH4  
B) C2H2  
C) Cl2CS 
D) CH3- 
E) CO2

Question 11

One resonance structure of N2O is  
The hybridized atomic orbitals of the central nitrogen atom which are consistent with this structure are ________.

Accepted Answer

A) four sp3 orbitals 
B) three sp2 orbitals and a p orbital 
C) two sp2 orbitals and two sp orbitals 
D) two sp orbitals and two p orbitals 
E) one sp orbital and two p orbitals 
A) four sp3 orbitals 
B) three sp2 orbitals and a p orbital 
C) two sp2 orbitals and two sp orbitals 
D) two sp orbitals and two p orbitals 
E) one sp orbital and two p orbitals

Question 12

Using the VSEPR model,the molecular geometry of the central atom in NCl3 is:

Accepted Answer

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

Question 13

The valence-bond method provides energy information about molecules.

Accepted Answer

A) True 
 B)False

Question 14

Which statement regarding VB theory is INCORRECT?

Accepted Answer

A) A single bond is a sigma bond. 
B) A triple bond is two sigma bonds and a pi bond. 
C) A double bond requires each atom to have an unhybridized p orbital. 
D) Both atoms in a triple bond have linear geometry. 
E) sp3 hybridization produces tetrahedral geometry. 
A) A single bond is a sigma bond. 
B) A triple bond is two sigma bonds and a pi bond. 
C) A double bond requires each atom to have an unhybridized p orbital. 
D) Both atoms in a triple bond have linear geometry. 
E) sp3 hybridization produces tetrahedral geometry.

Question 15

The structure of aspirin is given below.(Note that lone pairs are not shown. )  
What is the O-C-C bond angle,"x," in aspirin?

Accepted Answer

A) ~120° 
B) ~109° 
C) ~90° 
D) ~180° 
A) ~120° 
B) ~109° 
C) ~90° 
D) ~180°

Question 16

For the molecule

Accepted Answer

A) the geometry about O is linear 
B) the hybridization on O is sp 
C) O is not hybridized 
D) both carbons are sp2 hybridized 
E) there are two π bonds between the two carbons 
A) the geometry about O is linear 
B) the hybridization on O is sp 
C) O is not hybridized 
D) both carbons are sp2 hybridized 
E) there are two π bonds between the two carbons

Question 17

What are the F-Po-F bond angles in PoF6 ?

Accepted Answer

A) 60° 
B) 90° 
C) 109.5° 
D) 120° 
A) 60° 
B) 90° 
C) 109.5° 
D) 120°

Question 18

Choose the INCORRECT statement about AsF6-.

Accepted Answer

A) The hybridization is sp3d2. 
B) The molecule is octahedral. 
C) There are no π bonds. 
D) There is one lone pair of electrons. 
E) There are six σ bonds. 
A) The hybridization is sp3d2. 
B) The molecule is octahedral. 
C) There are no π bonds. 
D) There is one lone pair of electrons. 
E) There are six σ bonds.

Question 19

According to the principles of VSEPR applied on ICl5,which of the following is INCORRECT?

Accepted Answer

A) VSEPR formula = AX5E 
B) molecular geometry = square pyramidal 
C) hybridization = sp3d  
D) electron-group geometry = octahedral 
E) one lone pair and 5 bonding pairs 
A) VSEPR formula = AX5E 
B) molecular geometry = square pyramidal 
C) hybridization = sp3d  
D) electron-group geometry = octahedral 
E) one lone pair and 5 bonding pairs

Question 20

Using the VSEPR model,the electron-group geometry of the central atom in SF4 is:

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

Exam 11: Chemical Bonding Ii: Valence Bond and Molecular Orbital Theories

What is the O-B-O bond angle in BO33-?

Which statement is INCORRECT?

Using the VSEPR model,the molecular geometry of the central atom in H2Se is:

What are the ideal bond angles for H2O?

Which of the following statements concerning the carbon dioxide molecule is correct?

Choose the INCORRECT statement about CO2.

The valence-bond method describes covalent bonding as the overlap of partially filled orbitals.

Which of the following species is paramagnetic?

Choose the INCORRECT statement about NO2+.

Which of the following carbon molecules has sp hybridization?

One resonance structure of N2O is The hybridized atomic orbitals of the central nitrogen atom which are consistent with this structure are ________.

Using the VSEPR model,the molecular geometry of the central atom in NCl3 is:

The valence-bond method provides energy information about molecules.

Which statement regarding VB theory is INCORRECT?

The structure of aspirin is given below.(Note that lone pairs are not shown. ) What is the O-C-C bond angle,"x," in aspirin?

For the molecule

What are the F-Po-F bond angles in PoF6 ?

Choose the INCORRECT statement about AsF6-.

According to the principles of VSEPR applied on ICl5,which of the following is INCORRECT?

Using the VSEPR model,the electron-group geometry of the central atom in SF4 is:

Matter: Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Compounds

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Intermolecular Forces: Liquids and Solids

Spontaneous Change: Entropy and Gibbs Energy

Solutions and Their Physical Properties

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acidbase Equilibria

Solubility and Complex-Ion Equilibria

Electrochemistry

Chemical Kinetics

Chemistry of the Main-Group Elements I: Groups 1,2,13,and 14

Chemistry of the Main-Group Elements Ii: Groups 18,17,16,15,and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

What is the O-B-O bond angle in BO₃^3-?

Using the VSEPR model,the molecular geometry of the central atom in H₂Se is:

What are the ideal bond angles for H₂O?

Choose the INCORRECT statement about CO₂.

Choose the INCORRECT statement about NO₂⁺.

One resonance structure of N₂O is The hybridized atomic orbitals of the central nitrogen atom which are consistent with this structure are ________.

Using the VSEPR model,the molecular geometry of the central atom in NCl₃ is:

What are the F-Po-F bond angles in PoF₆ ?

Choose the INCORRECT statement about AsF₆^-.

According to the principles of VSEPR applied on ICl₅,which of the following is INCORRECT?

Using the VSEPR model,the electron-group geometry of the central atom in SF₄ is: