Question 1

Which of the following has the greatest bond strength?

Accepted Answer

A) B2 
B) O2- 
C) CN- 
D) O2+ 
E) NO- 
A) B2 
B) O2- 
C) CN- 
D) O2+ 
E) NO-

Question 2

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

Accepted Answer

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

Question 3

The CO molecule has the bond order:

Accepted Answer

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

Question 4

The hybridization of Br in BrF3 is

Accepted Answer

A) sp 
B) sp2 
C) sp3 
D) dsp3 
E) d2sp3 
A) sp 
B) sp2 
C) sp3 
D) dsp3 
E) d2sp3

Question 5

What is the bond order of He2+?

Accepted Answer

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

Question 6

Consider the following Lewis structure:   Which statement about the molecule is false?

Accepted Answer

A) There are 10 sigma and 2 pi bonds. 
B) C-2 is sp2 hybridized with bond angles of 120°. 
C) Oxygen is sp3 hybridized. 
D) This molecule contains 28 valence electrons. 
E) There are some H-C-H bond angles of about 109° in the molecule. 
A) There are 10 sigma and 2 pi bonds. 
B) C-2 is sp2 hybridized with bond angles of 120°. 
C) Oxygen is sp3 hybridized. 
D) This molecule contains 28 valence electrons. 
E) There are some H-C-H bond angles of about 109° in the molecule.

Question 7

When comparing Be2 and H2:
I.Be2 is more stable because it contains both bonding and antibonding valence electrons.
II.H2 has a higher bond order than Be2.
III.H2 is more stable because it only contains  $\sigma$1s electrons.
IV.H2 is more stable because it is diamagnetic,whereas Be2 is paramagnetic.

Accepted Answer

A) I,II 
B) III only 
C) II,III 
D) II,III,IV 
E) III,IV 
A) I,II 
B) III only 
C) II,III 
D) II,III,IV 
E) III,IV

Question 8

Consider the molecule and the following hybridization choices:  
-What is the hybridization of the carbon atom that is bonded to chlorine?

Accepted Answer

A) sp 
B) sp2 
C) sp3 
D) dsp3 
E) d2sp3 
A) sp 
B) sp2 
C) sp3 
D) dsp3 
E) d2sp3

Question 9

Consider the following Lewis structure:   What is the hybridization of the atoms O,C-1,C-2,and C-4?

Accepted Answer

A) sp3 sp3 sp sp2 
B) sp sp3 sp sp 
C) sp sp2 sp sp2 
D) sp2 sp3 sp2 sp3 
E) sp3 sp sp sp2
O C-1 C-2 C-4 
A) sp3 sp3 sp sp2 
B) sp sp3 sp sp 
C) sp sp2 sp sp2 
D) sp2 sp3 sp2 sp3 
E) sp3 sp sp sp2
O C-1 C-2 C-4

Question 10

Consider the benzene molecule.Which of the following statements about the molecule is false?

Accepted Answer

A) All six C-C bonds are known to be equivalent. 
B) Each carbon atom is sp2 hybridized. 
C) The localized electron model must invoke resonance to account for the six equal C-C bonds. 
D) It has delocalized pi bonding in the molecule. 
E) The pi bonds of carbon involve sp2 orbitals. 
A) All six C-C bonds are known to be equivalent. 
B) Each carbon atom is sp2 hybridized. 
C) The localized electron model must invoke resonance to account for the six equal C-C bonds. 
D) It has delocalized pi bonding in the molecule. 
E) The pi bonds of carbon involve sp2 orbitals.

Question 11

Consider the molecule and the following hybridization choices:  
-What is the hybridization of the oxygen atom?

Accepted Answer

A) sp 
B) sp2 
C) sp3 
D) dsp3 
E) d2sp3 
A) sp 
B) sp2 
C) sp3 
D) dsp3 
E) d2sp3

Question 12

Complete the Lewis structure for the following molecule:   This molecule has __________ sigma and __________ pi bonds.

Accepted Answer

A) 4,5 
B) 6,3 
C) 11,5 
D) 13,2 
E) 13,3 
A) 4,5 
B) 6,3 
C) 11,5 
D) 13,2 
E) 13,3

Question 13

Which of the following statements about the CO32- ion is false?

Accepted Answer

A) The orbitals on the carbon atom are sp2 hybridized. 
B) The ion is expected to be diamagnetic. 
C) The C-O bonds are different lengths. 
D) The ion has a total of 24 electrons. 
E) All the above statements are true. 
A) The orbitals on the carbon atom are sp2 hybridized. 
B) The ion is expected to be diamagnetic. 
C) The C-O bonds are different lengths. 
D) The ion has a total of 24 electrons. 
E) All the above statements are true.

Question 14

Which of the following molecules or ions is not paramagnetic in its ground state?

Accepted Answer

A) O2 
B) O2+ 
C) B2 
D) NO 
E) F2 
A) O2 
B) O2+ 
C) B2 
D) NO 
E) F2

Question 15

Atoms that are sp2 hybridized form ____ pi bond(s).

Accepted Answer

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

Question 16

The hybridization of the B in BH3 is sp3.

Accepted Answer

A) True 
 B)False

Question 17

The electron configuration of a particular diatomic species is ( $\sigma$2s)2( $\sigma$*2s)2( $\sigma$2p)2($\pi$2p)4($\pi$*2p)2.What is the bond order for this species?

Accepted Answer

A) 3.5 
B) 3 
C) 2.5 
D) 2 
E) 1.5 
A) 3.5 
B) 3 
C) 2.5 
D) 2 
E) 1.5

Question 18

In the molecular orbital description of CO:

Accepted Answer

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

Question 19

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

Accepted Answer

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

Question 20

Use the molecules below to answer the next three questions.  
-Which molecule(s)have at least one carbon atom that is sp hybridized?

Accepted Answer

A) I 
B) II 
C) III 
D) all of the above 
E) none of the above 
A) I 
B) II 
C) III 
D) all of the above 
E) none of the above

Exam 9: Covalent Bonding: Orbitals

Which of the following has the greatest bond strength?

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

The CO molecule has the bond order:

The hybridization of Br in BrF3 is

What is the bond order of He2+?

Consider the following Lewis structure: Which statement about the molecule is false?

Consider the molecule and the following hybridization choices: -What is the hybridization of the carbon atom that is bonded to chlorine?

Consider the following Lewis structure: What is the hybridization of the atoms O,C-1,C-2,and C-4?

Consider the benzene molecule.Which of the following statements about the molecule is false?

Consider the molecule and the following hybridization choices: -What is the hybridization of the oxygen atom?

Complete the Lewis structure for the following molecule: This molecule has __________ sigma and __________ pi bonds.

Which of the following statements about the CO32- ion is false?

Which of the following molecules or ions is not paramagnetic in its ground state?

Atoms that are sp2 hybridized form ____ pi bond(s).

The hybridization of the B in BH3 is sp3.

The electron configuration of a particular diatomic species is ( σ\sigmaσ 2s)2( σ\sigmaσ *2s)2( σ\sigmaσ 2p)2( π\piπ 2p)4( π\piπ *2p)2.What is the bond order for this species?

In the molecular orbital description of CO:

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

Use the molecules below to answer the next three questions. -Which molecule(s)have at least one carbon atom that is sp hybridized?

Chemical Foundations

Atoms, molecules, and Ions

Stoichiometry

Chemical Reactions and Solutions Stoichiometry

Gases

Thermochemistry

Atomic Structure and Periodicity

Bonding: General Concepts

Liquids and Solids

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria

Solubility and Complex Ion Equilibria

Spontaneity, entropy, and Free Energy

Electrochemistry

The Nucleus: a Chemists View

The Representative Elements

Transition Metals and Coordination Chemistry

Organic and Biological Molecules

Filters

The hybridization of Br in BrF₃ is

What is the bond order of He₂⁺?

Complete the Lewis structure for the following molecule: This molecule has sigma and pi bonds.

Which of the following statements about the CO₃²^- ion is false?

Atoms that are sp² hybridized form ____ pi bond(s).

The hybridization of the B in BH₃ is sp³.

The electron configuration of a particular diatomic species is ( $\sigma$ _2s)²( $\sigma$ _2s)²( $\sigma$ _2p)²( $\pi$ _2p)⁴( $\pi$ _2p)².What is the bond order for this species?