Question 1

Based on molecular orbital theory,in order to weaken the N-N bond in N2,electrons should be

Accepted Answer

A) added. 
B) removed. 
C) either added or removed. 
D) neither added nor removed. 
A) added. 
B) removed. 
C) either added or removed. 
D) neither added nor removed.

Question 2

Molecular orbitals extending over more than two atoms provide an explanation for

Accepted Answer

A) coordinate covalent bonding. 
B) ionic bonding. 
C) paramagnetism. 
D) resonance. 
A) coordinate covalent bonding. 
B) ionic bonding. 
C) paramagnetism. 
D) resonance.

Question 3

Which drawing represents the molecular orbital containing the highest energy electrons in the O22- molecular ion in its the ground state?

Accepted Answer

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

Question 4

What is the O-N-O bond angle in NO3-?

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°

Question 5

In the most acceptable electron-dot structure for carbonyl fluoride,COF2 the central atom is

Accepted Answer

A) C,which is singly-bonded to O. 
B) C,which is doubly-bonded to O. 
C) O,which is singly-bonded to C 
D) O,which is doubly-bonded to C. 
A) C,which is singly-bonded to O. 
B) C,which is doubly-bonded to O. 
C) O,which is singly-bonded to C 
D) O,which is doubly-bonded to C.

Question 6

How many resonance structures are required in the electron-dot structure of CO32-?

Accepted Answer

A) two 
B) three 
C) four 
D) five 
A) two 
B) three 
C) four 
D) five

Question 7

Given that O2 is paramagnetic and has a bond order of 2,and its highest occupied molecular orbital is antibonding,what would be the expected bond orders for O22- and O22+?

Accepted Answer

A) 1 for O22- and 3 for O22+ 
B) 3/2 for O22- and 5/2 for O22+ 
C) 5/2 for O22- and 3/2 for O22+ 
D) 3 for O22- and 1 for O22+ 
A) 1 for O22- and 3 for O22+ 
B) 3/2 for O22- and 5/2 for O22+ 
C) 5/2 for O22- and 3/2 for O22+ 
D) 3 for O22- and 1 for O22+

Question 8

What is geometry around the nitrogen atom?

Accepted Answer

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

Question 9

What is the geometry around the central atom in the following molecular model of PF6-?

Accepted Answer

A) trigonal bipyramidal 
B) octahedral 
C) square pyramidal 
D) square planar 
A) trigonal bipyramidal 
B) octahedral 
C) square pyramidal 
D) square planar

Question 10

Which element can accommodate more than eight electrons in its valence shell?

Accepted Answer

A) C 
B) O 
C) P 
D) He 
A) C 
B) O 
C) P 
D) He

Question 11

Consider a molecule with the following connections:  
When a valid electron dot structure is written,how many double bonds will the molecule contain?

Accepted Answer

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

Question 12

Based on formal charge considerations,the electron-dot structure of CO32- ion has

Accepted Answer

A) two resonance structures involving two single bonds and one double bond. 
B) two resonance structures involving one single bond and two double bonds. 
C) three resonance structures involving two single bonds and one double bond. 
D) three resonance structures involving one single bond and two double bonds. 
A) two resonance structures involving two single bonds and one double bond. 
B) two resonance structures involving one single bond and two double bonds. 
C) three resonance structures involving two single bonds and one double bond. 
D) three resonance structures involving one single bond and two double bonds.

Question 13

What is the bond angle in the following molecular model of NH2-?

Accepted Answer

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

Question 14

Which molecular orbital resembles a d-orbital?

Accepted Answer

A) σ 
B) σ* 
C) π 
D) π* 
A) σ 
B) σ* 
C) π 
D) π*

Question 15

Which is the best description of the bonding in NO3-?

Accepted Answer

A) 3 N-O σ bonds and no N-O π bonds 
B) 3 N-O σ bonds and 3 N-O π bonds 
C) no N-O σ bonds and delocalized N-O π molecular orbitals extending over all four atoms 
D) 3 N-O σ bonds and delocalized N-O π molecular orbitals extending over all four atoms 
A) 3 N-O σ bonds and no N-O π bonds 
B) 3 N-O σ bonds and 3 N-O π bonds 
C) no N-O σ bonds and delocalized N-O π molecular orbitals extending over all four atoms 
D) 3 N-O σ bonds and delocalized N-O π molecular orbitals extending over all four atoms

Question 16

What are the bond angles in the following molecular model of BrF5?

Accepted Answer

A) some less than 90° and some less than 120° but greater than 90° 
B) 90° and 120° 
C) some less than 90° and some less than 180° but greater than 120° 
D) 90° and 180° 
A) some less than 90° and some less than 120° but greater than 90° 
B) 90° and 120° 
C) some less than 90° and some less than 180° but greater than 120° 
D) 90° and 180°

Question 17

What is the molecular geometry of AsCl3?

Accepted Answer

A) T-shaped 
B) tetrahedral 
C) trigonal planar 
D) trigonal pyramidal 
A) T-shaped 
B) tetrahedral 
C) trigonal planar 
D) trigonal pyramidal

Question 18

A molecular model of SO42- is shown below.Based on the best Lewis electron-dot structure for SO42- and formal charge considerations,what is the predicted S-O bond order for each S-O bond?

Accepted Answer

A) 1 
B) 1)33 
C) 1)5 
D) 2 
A) 1 
B) 1)33 
C) 1)5 
D) 2

Question 19

Which bond should have the highest bond dissociation energy?

Accepted Answer

A) N-N 
B) N N 
C) N=N 
D) All three bonds should have about the same dissociation energy. 
A) N-N 
B) N N 
C) N=N 
D) All three bonds should have about the same dissociation energy.

Question 20

The SO3 molecule can be described as having 3 S=O σ bonds and π molecular orbitals containing

Accepted Answer

A) 2 electrons. 
B) 4 electrons. 
C) 6 electrons. 
D) 8 electrons. 
A) 2 electrons. 
B) 4 electrons. 
C) 6 electrons. 
D) 8 electrons.

Exam 7: Covalent Bonds and Molecular Structure

Based on molecular orbital theory,in order to weaken the N-N bond in N2,electrons should be

Molecular orbitals extending over more than two atoms provide an explanation for

Which drawing represents the molecular orbital containing the highest energy electrons in the O22- molecular ion in its the ground state?

What is the O-N-O bond angle in NO3-?

In the most acceptable electron-dot structure for carbonyl fluoride,COF2 the central atom is

How many resonance structures are required in the electron-dot structure of CO32-?

Given that O2 is paramagnetic and has a bond order of 2,and its highest occupied molecular orbital is antibonding,what would be the expected bond orders for O22- and O22+?

What is geometry around the nitrogen atom?

What is the geometry around the central atom in the following molecular model of PF6-?

Which element can accommodate more than eight electrons in its valence shell?

Consider a molecule with the following connections: When a valid electron dot structure is written,how many double bonds will the molecule contain?

Based on formal charge considerations,the electron-dot structure of CO32- ion has

What is the bond angle in the following molecular model of NH2-?

Which molecular orbital resembles a d-orbital?

Which is the best description of the bonding in NO3-?

What are the bond angles in the following molecular model of BrF5?

What is the molecular geometry of AsCl3?

A molecular model of SO42- is shown below.Based on the best Lewis electron-dot structure for SO42- and formal charge considerations,what is the predicted S-O bond order for each S-O bond?

Which bond should have the highest bond dissociation energy?

The SO3 molecule can be described as having 3 S=O σ bonds and π molecular orbitals containing

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Filters

Based on molecular orbital theory,in order to weaken the N-N bond in N₂,electrons should be

Which drawing represents the molecular orbital containing the highest energy electrons in the O₂^2- molecular ion in its the ground state?

What is the O-N-O bond angle in NO₃^-?

In the most acceptable electron-dot structure for carbonyl fluoride,COF₂ the central atom is

How many resonance structures are required in the electron-dot structure of CO₃^2-?

Given that O₂ is paramagnetic and has a bond order of 2,and its highest occupied molecular orbital is antibonding,what would be the expected bond orders for O₂^2- and O₂²⁺?

What is the geometry around the central atom in the following molecular model of PF₆^-?

Based on formal charge considerations,the electron-dot structure of CO₃^2- ion has

What is the bond angle in the following molecular model of NH₂^-?

Which is the best description of the bonding in NO₃^-?

What are the bond angles in the following molecular model of BrF₅?

What is the molecular geometry of AsCl₃?

A molecular model of SO₄^2- is shown below.Based on the best Lewis electron-dot structure for SO₄^2- and formal charge considerations,what is the predicted S-O bond order for each S-O bond?

The SO₃ molecule can be described as having 3 S=O σ bonds and π molecular orbitals containing