Question 1

What is the valence electron molecular orbital electron configuration of C2?

Accepted Answer

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

Question 2

What is the molecular geometry of the ClF4F1F1F1S1F1F1F10 ion?

Accepted Answer

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

Question 3

Which bond is the least polar?

Accepted Answer

A) carbon-oxygen 
B) carbon-sulfur 
C) carbon-nitrogen 
D) carbon-fluorine 
E) carbon-chlorine 
A) carbon-oxygen 
B) carbon-sulfur 
C) carbon-nitrogen 
D) carbon-fluorine 
E) carbon-chlorine

Question 4

Identify the hybridization of the three carbon atoms labeled in the following molecule.   I II III I II III

Accepted Answer

A) sp2, sp3, sp2 
B) sp3, sp2, sp 
C) sp, sp3, sp2 
D) sp2, sp, sp3 
E) sp2, sp3, sp 
A) sp2, sp3, sp2 
B) sp3, sp2, sp 
C) sp, sp3, sp2 
D) sp2, sp, sp3 
E) sp2, sp3, sp

Question 5

Which type of molecular orbital has only one nodal plane which contains the atomic nuclei?

Accepted Answer

A) (F1F1F1S1F1F1F10) 
B) (F1F1F1S1F1F1F10) 
C) (F1F1F1S1F1F1F10*) 
D) (F1F1F1S1F1F1F10*) 
E) s 
A) (F1F1F1S1F1F1F10) 
B) (F1F1F1S1F1F1F10) 
C) (F1F1F1S1F1F1F10*) 
D) (F1F1F1S1F1F1F10*) 
E) s

Question 6

Predict the bond angle indicated in SF4.

Accepted Answer

A) 120F1F1F1S1F1F1F10 
B) 90F1F1F1S1F1F1F10 
C) greater than 120F1F1F1S1F1F1F10 
D) less than 120F1F1F1S1F1F1F10 
E) 109.5F1F1F1S1F1F1F10 
A) 120F1F1F1S1F1F1F10 
B) 90F1F1F1S1F1F1F10 
C) greater than 120F1F1F1S1F1F1F10 
D) less than 120F1F1F1S1F1F1F10 
E) 109.5F1F1F1S1F1F1F10

Question 7

When Si is doped with P, it produces a(n) ________-type semiconductor.

Accepted Answer

The answer of When Si is doped with P, it...

Question 8

In the following reaction, what is the change in geometry of the silicon-containing compound

Accepted Answer

A) tetrahedral to octahedral 
B) tetrahedral to trigonal bipyramidal 
C) T-shaped to octahedral 
D) seesaw to octahedral 
E) seesaw to square pyramidal 
A) tetrahedral to octahedral 
B) tetrahedral to trigonal bipyramidal 
C) T-shaped to octahedral 
D) seesaw to octahedral 
E) seesaw to square pyramidal

Question 9

Select which of the following repulsive interactions between electron pairs would be greatest.

Accepted Answer

A)    
B)    
C)    
D)    
E) All involve equal repulsive forces. 
A)    
B)    
C)    
D)    
E) All involve equal repulsive forces.

Question 10

Which of the following compounds has the same molecular shape as CCl3H?

Accepted Answer

A) SiF4 
B) KrF4 
C) SF4 
D) C2H4 
E) C2H2 
A) SiF4 
B) KrF4 
C) SF4 
D) C2H4 
E) C2H2

Question 11

Both cyclohexane (C6H12) and benzene (C6H6) have the carbon atoms forming a six-member ring. In a valence bond picture of the C-C bonds, ________ hybrid orbitals would overlap for cyclohexane, and ________ hybrid orbitals would overlap for benzene.

Accepted Answer

A) sp; sp 
B) sp; sp2 
C) sp2; sp3 
D) sp3; sp2 
E) sp3; sp 
A) sp; sp 
B) sp; sp2 
C) sp2; sp3 
D) sp3; sp2 
E) sp3; sp

Question 12

Identify the hybridization of atomic orbitals for atoms N1, N2, C1, C2, and C3 in caffeine, which is shown below.

Accepted Answer

N1: sp²; N2

Question 13

What are the hybridizations of the carbon atoms in CH3CH2(CO)H, in order from left to right? Note that the C   F1F1F1S1F1F1F10O bond is a double bond.

Accepted Answer

A) sp3, sp3, sp2 
B) sp3, sp3, sp3 
C) sp3, sp2, sp3 
D) sp2, sp2, sp3 
E) sp3, sp2, sp2 
A) sp3, sp3, sp2 
B) sp3, sp3, sp3 
C) sp3, sp2, sp3 
D) sp2, sp2, sp3 
E) sp3, sp2, sp2

Question 14

Which of the following materials could be classified as a p-type semiconductor?

Accepted Answer

A) Ge doped with As 
B) C doped with P 
C) Si doped with B 
D) Sn doped with Sb 
E) None of these are p-type semiconductors. 
A) Ge doped with As 
B) C doped with P 
C) Si doped with B 
D) Sn doped with Sb 
E) None of these are p-type semiconductors.

Question 15

Which of these molecules is chiral?

Accepted Answer

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

Question 16

Which of the following molecules is diamagnetic?

Accepted Answer

A) F2 
B) B2 
C) O2 
D) C2F1F1F1S1F1F1F10 
E) N2F1F1F1S1F1F1F10 
A) F2 
B) B2 
C) O2 
D) C2F1F1F1S1F1F1F10 
E) N2F1F1F1S1F1F1F10

Question 17

Identify the hybridization of the three carbon atoms labeled in the following molecule.

Accepted Answer

I: sp²; II:

Question 18

Which element would be used to dope germanium to produce an n-type semiconductor?

Accepted Answer

A) Ga 
B) Sn 
C) Si 
D) As 
E) Cu 
A) Ga 
B) Sn 
C) Si 
D) As 
E) Cu

Question 19

GaAs and AlGaAs2 are examples of ________ semiconductors.

Accepted Answer

A) light-emitting diode (LE
D)  
B) sound-emitting 
C) np 
D) non- 
E) dual voltage 
A) light-emitting diode (LE
D)  
B) sound-emitting 
C) np 
D) non- 
E) dual voltage

Question 20

Which statement concerning benzene is not correct?

Accepted Answer

A) A second resonance structure is needed to describe benzene. 
B) All the F1F1F1S1F1F1F10 bonds originate from p atomic orbitals. 
C) Benzene does not have a dipole moment. 
D) The carbon atomic orbitals are sp2 hybridized. 
E) Benzene has both long and short carbon-carbon bonds. 
A) A second resonance structure is needed to describe benzene. 
B) All the F1F1F1S1F1F1F10 bonds originate from p atomic orbitals. 
C) Benzene does not have a dipole moment. 
D) The carbon atomic orbitals are sp2 hybridized. 
E) Benzene has both long and short carbon-carbon bonds.

Exam 9: Molecular Geometry: Shape Determines Function

What is the valence electron molecular orbital electron configuration of C2?

What is the molecular geometry of the ClF4 ion?

Which bond is the least polar?

Identify the hybridization of the three carbon atoms labeled in the following molecule. I II III I II III

Which type of molecular orbital has only one nodal plane which contains the atomic nuclei?

Predict the bond angle indicated in SF4.

When Si is doped with P, it produces a(n) ________-type semiconductor.

In the following reaction, what is the change in geometry of the silicon-containing compound

Select which of the following repulsive interactions between electron pairs would be greatest.

Which of the following compounds has the same molecular shape as CCl3H?

Both cyclohexane (C6H12) and benzene (C6H6) have the carbon atoms forming a six-member ring. In a valence bond picture of the C-C bonds, ________ hybrid orbitals would overlap for cyclohexane, and ________ hybrid orbitals would overlap for benzene.

Identify the hybridization of atomic orbitals for atoms N1, N2, C1, C2, and C3 in caffeine, which is shown below.

What are the hybridizations of the carbon atoms in CH3CH2(CO)H, in order from left to right? Note that the C O bond is a double bond.

Which of the following materials could be classified as a p-type semiconductor?

Which of these molecules is chiral?

Which of the following molecules is diamagnetic?

Identify the hybridization of the three carbon atoms labeled in the following molecule.

Which element would be used to dope germanium to produce an n-type semiconductor?

GaAs and AlGaAs2 are examples of ________ semiconductors.

Which statement concerning benzene is not correct?

Matter and Energy: The Origin of the Universe

Atoms, Ions, and Molecules: Matter Starts Here

Stoichiometry: Mass, Formulas, and Reactions

Solution Chemistry: The Hydrosphere

Thermochemistry: Energy Changes in Reactions

Properties of Gases: The Air We Breathe

A Quantum Model of Atoms: Waves and Particles

Chemical Bonds: What Makes a Gas a Greenhouse Gas

Intermolecular Forces: The Uniqueness of Water

Solutions: Properties and Behavior

Solids: Crystals, Alloys, and Polymers

Chemical Kinetics: Reactions in the Atmosphere

Chemical Equilibrium: How Much Product Does a Reaction Really Make

Acidbase Equilibria: Proton Transfer in Biological Systems

Additional Aqueous Equilibria: Chemistry and the Oceans

Thermodynamics: Spontaneous and Nonspontaneous Reactions and Processes

Electrochemistry: The Quest for Clean Energy

Nuclear Chemistry: Applications to Energy and Medicine

Organic and Biological Molecules: the Compounds of Life

The Main Group Elements: Life and the Periodic Table

Transition Metals: Biological and Medical Applications

Filters

What is the valence electron molecular orbital electron configuration of C₂?

What is the molecular geometry of the ClF₄^ ion?

Predict the bond angle indicated in SF₄.

Which of the following compounds has the same molecular shape as CCl₃H?

Both cyclohexane (C₆H₁₂) and benzene (C₆H₆) have the carbon atoms forming a six-member ring. In a valence bond picture of the C-C bonds, hybrid orbitals would overlap for cyclohexane, and hybrid orbitals would overlap for benzene.

What are the hybridizations of the carbon atoms in CH₃CH₂(CO)H, in order from left to right? Note that the C O bond is a double bond.

GaAs and AlGaAs₂ are examples of ________ semiconductors.