Question 1

A π bond is the result of the

Accepted Answer

A) overlap of two s orbitals. 
B) overlap of two p orbitals along their axes. 
C) sideways overlap of two parallel p orbitals. 
D) overlap of an s orbital and a p orbital. 
E) sideways overlap of two s orbitals. 
A) overlap of two s orbitals. 
B) overlap of two p orbitals along their axes. 
C) sideways overlap of two parallel p orbitals. 
D) overlap of an s orbital and a p orbital. 
E) sideways overlap of two s orbitals.

Question 2

The following statements concern molecules that require resonance.Which is true?

Accepted Answer

A) The benzene molecule is best described by the MO theory. 
B) The sigma bonding is clearly delocalized. 
C) Both the sigma bonding and the pi bonding are delocalized. 
D) The benzene molecule is best described by the localized electron model. 
E) The pi bonding is clearly delocalized. 
A) The benzene molecule is best described by the MO theory. 
B) The sigma bonding is clearly delocalized. 
C) Both the sigma bonding and the pi bonding are delocalized. 
D) The benzene molecule is best described by the localized electron model. 
E) The pi bonding is clearly delocalized.

Question 3

The molecular geometry of the CH3+ ion is best described as

Accepted Answer

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

Question 4

Which molecule or ion does not have a tetrahedral molecular geometry?

Accepted Answer

A) ICl4- 
B) CCl4 
C) GeCl4 
D) BrO4- 
E) SiCl4 
A) ICl4- 
B) CCl4 
C) GeCl4 
D) BrO4- 
E) SiCl4

Question 5

What is the molecular geometry of the thiosulfate ion,S2O32-?

Accepted Answer

A) tetrahedral 
B) trigonal bipyramidal 
C) pyramidal 
D) bent 
E) square planar 
A) tetrahedral 
B) trigonal bipyramidal 
C) pyramidal 
D) bent 
E) square planar

Question 6

If four orbitals on one atom overlap four orbitals on a second atom,how many molecular orbitals will form?

Accepted Answer

A) 4 
B) 16 
C) 1 
D) 8 
E) none of these 
A) 4 
B) 16 
C) 1 
D) 8 
E) none of these

Question 7

What is the molecular geometry of the ICl4- ion?

Accepted Answer

A) octahedral 
B) pentagonal 
C) tetrahedral 
D) rectangular 
E) square planar 
A) octahedral 
B) pentagonal 
C) tetrahedral 
D) rectangular 
E) square planar

Question 8

According to valence-bond theory,the bonding in ketene,H2CCO,is best described as

Accepted Answer

A) five π bonds. 
B) three σ bonds and two π bonds. 
C) four σ bonds and two π bonds. 
D) four σ bonds and one π bond. 
E) five σ bonds. 
A) five π bonds. 
B) three σ bonds and two π bonds. 
C) four σ bonds and two π bonds. 
D) four σ bonds and one π bond. 
E) five σ bonds.

Question 9

In the molecular orbital description of CO,

Accepted Answer

A) six molecular orbitals contain electrons. 
B) there are two unpaired electrons. 
C) the bond order is 3. 
D) the highest-energy electrons occupy antibonding orbitals. 
E) All of the above are false. 
A) six molecular orbitals contain electrons. 
B) there are two unpaired electrons. 
C) the bond order is 3. 
D) the highest-energy electrons occupy antibonding orbitals. 
E) All of the above are false.

Question 10

Which molecule or ion has a trigonal pyramidal molecular geometry?

Accepted Answer

A) BF3 
B) C2H4 
C) SO3 
D) SO32- 
E) CO32- 
A) BF3 
B) C2H4 
C) SO3 
D) SO32- 
E) CO32-

Question 11

Which molecule or ion is nonlinear?

Accepted Answer

A) N2O 
B) O3 
C) OCN- 
D) NO2+ 
E) CS2 
A) N2O 
B) O3 
C) OCN- 
D) NO2+ 
E) CS2

Question 12

The approximate H-C-H bond angle in CH3+ is

Accepted Answer

A) 60°. 
B) 90°. 
C) 120°. 
D) 109°. 
E) 180°. 
A) 60°. 
B) 90°. 
C) 120°. 
D) 109°. 
E) 180°.

Question 13

The configuration (σ2s)2(σ2s*)2(π2py)1(π2px)1 is the molecular orbital description for the ground state of

Accepted Answer

A) C2. 
B) B2. 
C) Be2. 
D) Li2+. 
E) B22-. 
A) C2. 
B) B2. 
C) Be2. 
D) Li2+. 
E) B22-.

Question 14

Which of the following species has a bond order of 2.5?

Accepted Answer

A) N2 
B) NO+ 
C) CO 
D) O2+ 
E) NO- 
A) N2 
B) NO+ 
C) CO 
D) O2+ 
E) NO-

Question 15

Which of the following statements about the molecule O2 is false?

Accepted Answer

A) Its bond order is 2. 
B) The total number of electrons is 12. 
C) It is paramagnetic. 
D) It has two pi bonds. 
E) It has one sigma bond. 
A) Its bond order is 2. 
B) The total number of electrons is 12. 
C) It is paramagnetic. 
D) It has two pi bonds. 
E) It has one sigma bond.

Question 16

Which of the following statements is true?

Accepted Answer

A) A π bond is twice as strong as a single bond. 
B) A π bond results from the sideways overlap of hybridized orbitals. 
C) A double bond consists of a π bond and a σ bond. 
D) A π bond has cylindrical symmetry about the bonding axis. 
E) A π bond is twice as strong as a σ bond. 
A) A π bond is twice as strong as a single bond. 
B) A π bond results from the sideways overlap of hybridized orbitals. 
C) A double bond consists of a π bond and a σ bond. 
D) A π bond has cylindrical symmetry about the bonding axis. 
E) A π bond is twice as strong as a σ bond.

Question 17

Which of the following molecules is polar?

Accepted Answer

A) SF6 
B) CCl4 
C) BF3 
D) NO2 
E) CO2 
A) SF6 
B) CCl4 
C) BF3 
D) NO2 
E) CO2

Question 18

What is the O-N-O bond angle in the nitrite ion?

Accepted Answer

A) 90° 
B) 180° and 90° 
C) 180° 
D) 120° 
E) 109° 
A) 90° 
B) 180° and 90° 
C) 180° 
D) 120° 
E) 109°

Question 19

Which of these statements about benzene is true?

Accepted Answer

A) Benzene is an example of a molecule that displays ionic bonding. 
B) Benzene contains only π bonds between C atoms. 
C) All carbon atoms in benzene are sp3 hybridized. 
D) The bond order of each C-C bond in benzene is 1.5. 
E) All of these statements are false. 
A) Benzene is an example of a molecule that displays ionic bonding. 
B) Benzene contains only π bonds between C atoms. 
C) All carbon atoms in benzene are sp3 hybridized. 
D) The bond order of each C-C bond in benzene is 1.5. 
E) All of these statements are false.

Question 20

Which molecule or ion does not contain two π bonds?

Accepted Answer

A) HCCH 
B) H2CCCH2 
C) NO- 
D) CS2 
E) SCN- 
A) HCCH 
B) H2CCCH2 
C) NO- 
D) CS2 
E) SCN-

Exam 10: Molecular Geometry and Chemical Bonding Theory

A π bond is the result of the

The following statements concern molecules that require resonance.Which is true?

The molecular geometry of the CH3+ ion is best described as

Which molecule or ion does not have a tetrahedral molecular geometry?

What is the molecular geometry of the thiosulfate ion,S2O32-?

If four orbitals on one atom overlap four orbitals on a second atom,how many molecular orbitals will form?

What is the molecular geometry of the ICl4- ion?

According to valence-bond theory,the bonding in ketene,H2CCO,is best described as

In the molecular orbital description of CO,

Which molecule or ion has a trigonal pyramidal molecular geometry?

Which molecule or ion is nonlinear?

The approximate H-C-H bond angle in CH3+ is

The configuration (σ2s)2(σ2s*)2(π2py)1(π2px)1 is the molecular orbital description for the ground state of

Which of the following species has a bond order of 2.5?

Which of the following statements about the molecule O2 is false?

Which of the following statements is true?

Which of the following molecules is polar?

What is the O-N-O bond angle in the nitrite ion?

Which of these statements about benzene is true?

Which molecule or ion does not contain two π bonds?

Chemistry and Measurement

Atoms, molecules, and Ions

Calculations With Chemical Formulas and Equations

Chemical Reactions

The Gaseous State

Thermochemistry

Quantum Theory of the Atom

Electron Configurations and Periodicity

Ionic and Covalent Bonding

States of Matter; Liquids and Solids

Solutions

Rates of Reaction

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria

Solubility and Complex-Ion Equilibria

Thermodynamics and Equilibrium

Electrochemistry

Nuclear Chemistry

Chemistry of the Main-Group Metals

The Transition Elements and Coordination Compounds

Organic Chemistry

Polymer Materials: Synthetic and Biological

Filters

The molecular geometry of the CH₃⁺ ion is best described as

What is the molecular geometry of the thiosulfate ion,S₂O₃^2-?

What is the molecular geometry of the ICl₄^- ion?

According to valence-bond theory,the bonding in ketene,H₂CCO,is best described as

The approximate H-C-H bond angle in CH₃⁺ is

The configuration (σ_2s)²(σ_2s*)²(π_2py)¹(π_2px)¹ is the molecular orbital description for the ground state of

Which of the following statements about the molecule O₂ is false?