Question 1

Determine the molecular geometry of CF2Cl2.

Accepted Answer

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

Question 2

What is the valence electron molecular orbital electron configuration of O2?

Accepted Answer

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

Question 3

Identify the hybridization of the atomic orbitals on carbon atoms labeled 1, 2, and 3. The hydrogen atoms and lone-pair electrons are not shown in the diagram.

Accepted Answer

C1: sp³; C2

Question 4

All homonuclear diatomic molecules ________

Accepted Answer

A) have polar bonds. 
B) are polar. 
C) are nonpolar. 
D) cannot vibrate. 
E) are liquids. 
A) have polar bonds. 
B) are polar. 
C) are nonpolar. 
D) cannot vibrate. 
E) are liquids.

Question 5

Electrical and thermal conductivity in metals ________

Accepted Answer

A) is explained by a dipolar coupling model. 
B) is explained by band theory. 
C) is explained by matrix isolation techniques. 
D) is explained by temporary ionization. 
E) is a function of the level of contamination by excess electrons. 
A) is explained by a dipolar coupling model. 
B) is explained by band theory. 
C) is explained by matrix isolation techniques. 
D) is explained by temporary ionization. 
E) is a function of the level of contamination by excess electrons.

Question 6

Which one of the following molecules is paramagnetic? These molecules are described by the MO energy diagram below. These molecular orbitals are formed from the 2s and 2p atomic orbitals.

Accepted Answer

A) Li2 
B) C22F1F1F1S1F1F1F10 
C) N22F1F1F1S1F1F1F10 
D) N22F1F1F1S1F1F1F10 
E) C2 
A) Li2 
B) C22F1F1F1S1F1F1F10 
C) N22F1F1F1S1F1F1F10 
D) N22F1F1F1S1F1F1F10 
E) C2

Question 7

A triatomic molecule with a bond angle close to 120o could be ________

Accepted Answer

A) SO2. 
B) N2O. 
C) HCN. 
D) CO2. 
E) BeH2. 
A) SO2. 
B) N2O. 
C) HCN. 
D) CO2. 
E) BeH2.

Question 8

Identify the molecular geometry of the molecular anion, SF5-, and the hybridization of the S atomic orbitals.

Accepted Answer

Square pyr

Question 9

Which statement about F1F1F1S1F1F1F10and F1F1F1S1F1F1F10bonds is correct?

Accepted Answer

A) A F1F1F1S1F1F1F10bond is twice as strong as a F1F1F1S1F1F1F10bond. 
B) A F1F1F1S1F1F1F10bond has cylindrical symmetry about the internuclear axis. 
C) A double bond, as in ethylene, consists of a F1F1F1S1F1F1F10bond and a F1F1F1S1F1F1F10bond. 
D) A F1F1F1S1F1F1F10bond, as in ethylene, is described by the overlap of hybridized atomic orbitals. 
E) Hydrogen forms F1F1F1S1F1F1F10 bonds when it bonds to other atoms. 
A) A F1F1F1S1F1F1F10bond is twice as strong as a F1F1F1S1F1F1F10bond. 
B) A F1F1F1S1F1F1F10bond has cylindrical symmetry about the internuclear axis. 
C) A double bond, as in ethylene, consists of a F1F1F1S1F1F1F10bond and a F1F1F1S1F1F1F10bond. 
D) A F1F1F1S1F1F1F10bond, as in ethylene, is described by the overlap of hybridized atomic orbitals. 
E) Hydrogen forms F1F1F1S1F1F1F10 bonds when it bonds to other atoms.

Question 10

For the series methane, ammonia, and water, the bond angle increases in the following order: H2O F1F1F1S1F1F1F10 NH3 F1F1F1S1F1F1F10 CH4. This trend is due to ________

Accepted Answer

A) a decreasing effective nuclear charge. 
B) a decrease in the number of lone pairs. 
C) an increase in atomic radius. 
D) an increase in the polarity of the molecules. 
E) an increasing effective nuclear charge. 
A) a decreasing effective nuclear charge. 
B) a decrease in the number of lone pairs. 
C) an increase in atomic radius. 
D) an increase in the polarity of the molecules. 
E) an increasing effective nuclear charge.

Question 11

Which of the following molecules has a central atom that is sp3 hybridized?

Accepted Answer

A) C2H2 
B) H2CO 
C) H2S 
D) C2H4 
E) C2H2Cl2 
A) C2H2 
B) H2CO 
C) H2S 
D) C2H4 
E) C2H2Cl2

Question 12

Which of the following compounds has a square pyramid geometry?

Accepted Answer

A) ICl3 
B) BrF5 
C) PCl5 
D) PH3 
E) SiF4 
A) ICl3 
B) BrF5 
C) PCl5 
D) PH3 
E) SiF4

Question 13

Identify the molecular geometry of the nitrate ion, NO3F1F1F1S1F1F1F10, and the hybridization of the N atomic orbitals.

Accepted Answer

Question 14

What is the molecular geometry around a central atom having three single bonds and two lone pairs (i.e., nonbonding pairs)?

Accepted Answer

A) T-shaped 
B) trigonal planar 
C) trigonal bipyramidal 
D) tetrahedral 
E) seesaw 
A) T-shaped 
B) trigonal planar 
C) trigonal bipyramidal 
D) tetrahedral 
E) seesaw

Question 15

What is the molecular geometry around a central atom having four single bonds and one lone pair (i.e., nonbonding pair)?

Accepted Answer

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

Question 16

In VSEPR theory, molecular geometry is determined by ________

Accepted Answer

A) electron-proton attractive forces. 
B) electron-electron attractive forces. 
C) electron-electron repulsive forces. 
D) proton-proton repulsive forces. 
E) electron-nucleus attractive forces. 
A) electron-proton attractive forces. 
B) electron-electron attractive forces. 
C) electron-electron repulsive forces. 
D) proton-proton repulsive forces. 
E) electron-nucleus attractive forces.

Question 17

Which of the following shows the orientation of the net dipole for OCS?

Accepted Answer

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

Question 18

The members of which pair of molecules are enantiomers?

Accepted Answer

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

Question 19

Boron nitride, BN, is a new high-tech material. According to the molecular orbital energy-level diagram below, which one of the following statements is not correct about boron nitride? These molecular orbitals are formed from the 2s and 2p atomic orbitals.

Accepted Answer

A) The bond order in BN is 2.0. 
B) The cation BNF1F1F1S1F1F1F10 has a longer bond than BN. 
C) BN is paramagnetic. 
D) The bond order in the cation BNF1F1F1S1F1F1F10 is 1.5. 
E) The anion BNF1F1F1S1F1F1F10 has a weaker bond than BN. 
A) The bond order in BN is 2.0. 
B) The cation BNF1F1F1S1F1F1F10 has a longer bond than BN. 
C) BN is paramagnetic. 
D) The bond order in the cation BNF1F1F1S1F1F1F10 is 1.5. 
E) The anion BNF1F1F1S1F1F1F10 has a weaker bond than BN.

Question 20

Which type of molecular orbital contains a node perpendicular to the axis connecting two atomic nuclei?

Accepted Answer

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

Exam 9: Molecular Geometry: Shape Determines Function

Determine the molecular geometry of CF2Cl2.

What is the valence electron molecular orbital electron configuration of O2?

Identify the hybridization of the atomic orbitals on carbon atoms labeled 1, 2, and 3. The hydrogen atoms and lone-pair electrons are not shown in the diagram.

All homonuclear diatomic molecules ________

Electrical and thermal conductivity in metals ________

Which one of the following molecules is paramagnetic? These molecules are described by the MO energy diagram below. These molecular orbitals are formed from the 2s and 2p atomic orbitals.

A triatomic molecule with a bond angle close to 120o could be ________

Identify the molecular geometry of the molecular anion, SF5-, and the hybridization of the S atomic orbitals.

Which statement about and bonds is correct?

For the series methane, ammonia, and water, the bond angle increases in the following order: H2O  NH3  CH4. This trend is due to ________

Which of the following molecules has a central atom that is sp3 hybridized?

Which of the following compounds has a square pyramid geometry?

Identify the molecular geometry of the nitrate ion, NO3, and the hybridization of the N atomic orbitals.

What is the molecular geometry around a central atom having three single bonds and two lone pairs (i.e., nonbonding pairs)?

What is the molecular geometry around a central atom having four single bonds and one lone pair (i.e., nonbonding pair)?

In VSEPR theory, molecular geometry is determined by ________

Which of the following shows the orientation of the net dipole for OCS?

The members of which pair of molecules are enantiomers?

Boron nitride, BN, is a new high-tech material. According to the molecular orbital energy-level diagram below, which one of the following statements is not correct about boron nitride? These molecular orbitals are formed from the 2s and 2p atomic orbitals.

Which type of molecular orbital contains a node perpendicular to the axis connecting two atomic nuclei?

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

Determine the molecular geometry of CF₂Cl₂.

What is the valence electron molecular orbital electron configuration of O₂?

A triatomic molecule with a bond angle close to 120^o could be ________

Identify the molecular geometry of the molecular anion, SF₅^-, and the hybridization of the S atomic orbitals.

For the series methane, ammonia, and water, the bond angle increases in the following order: H₂O  NH₃  CH₄. This trend is due to ________

Which of the following molecules has a central atom that is sp³ hybridized?

Identify the molecular geometry of the nitrate ion, NO₃^, and the hybridization of the N atomic orbitals.