Question 1

Which of the following is a correct Lewis electron-dot formula for CO?

Accepted Answer

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

Question 2

Choose which central atom in the following molecules is most electronegative.

Accepted Answer

A)  PH3 
B)  CH4 
C)  H2S 
D)  H2O 
E)  NH3 
A)  PH3 
B)  CH4 
C)  H2S 
D)  H2O 
E)  NH3

Question 3

Place the following molecules in order from smallest to largest H-N-H bond angles: NH4+,NH3,and NH2-.

Accepted Answer

A)  NH4+ 3 2- 
B)  NH4+ 2- 3 
C)  NH2- 3 4+ 
D)  NH2- 4+ 3 
E)  NH3 2- 4+ 
A)  NH4+ 3 2- 
B)  NH4+ 2- 3 
C)  NH2- 3 4+ 
D)  NH2- 4+ 3 
E)  NH3 2- 4+

Question 4

What are the approximate H-N-H bond angles in NH4+?

Accepted Answer

A)  109.5S1U1P1$\circ$S1S1P0 
B)  120S1U1P1$\circ$S1S1P0 
C)  109.5S1U1P1$\circ$S1S1P0 and 120S1U1P1$\circ$S1S1P0 
D)  90S1U1P1$\circ$S1S1P0 
E)  90S1U1P1$\circ$S1S1P0 and 120S1U1P1$\circ$S1S1P0 
A)  109.5S1U1P1$\circ$S1S1P0 
B)  120S1U1P1$\circ$S1S1P0 
C)  109.5S1U1P1$\circ$S1S1P0 and 120S1U1P1$\circ$S1S1P0 
D)  90S1U1P1$\circ$S1S1P0 
E)  90S1U1P1$\circ$S1S1P0 and 120S1U1P1$\circ$S1S1P0

Question 5

Which of the following groups contains no ionic compounds?

Accepted Answer

A)  HCN,NO2,Ca(NO3)2 
B)  PCl5,LiBr,Zn(OH)2 
C)  KOH,CCl4,SF4 
D)  NaH,CaF2,NaNH2 
E)  CH2O,H2S,NH3 
A)  HCN,NO2,Ca(NO3)2 
B)  PCl5,LiBr,Zn(OH)2 
C)  KOH,CCl4,SF4 
D)  NaH,CaF2,NaNH2 
E)  CH2O,H2S,NH3

Question 6

The following representation of an atom is called

Accepted Answer

A)  a Lewis dot structure. 
B)  an ion. 
C)  a structural formula. 
D)  an electrostatic potential map. 
E)  an ionic bond. 
A)  a Lewis dot structure. 
B)  an ion. 
C)  a structural formula. 
D)  an electrostatic potential map. 
E)  an ionic bond.

Question 7

Use VSEPR theory to predict the molecular geometry around the nitrogen atom in nitrite ion,NO2-.

Accepted Answer

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

Question 8

Use VSEPR theory to predict the electron-pair geometry and the molecular geometry of nitrogen trichloride,NCl3.

Accepted Answer

A)  The electron-pair geometry is linear,the molecular geometry is linear. 
B)  The electron-pair geometry is trigonal-planar,the molecular geometry is trigonal-planar. 
C)  The electron-pair geometry is trigonal-planar,the molecular geometry is bent. 
D)  The electron-pair geometry is tetrahedral,the molecular geometry is tetrahedral. 
E)  The electron-pair geometry is tetrahedral,the molecular geometry is trigonal-pyramidal. 
A)  The electron-pair geometry is linear,the molecular geometry is linear. 
B)  The electron-pair geometry is trigonal-planar,the molecular geometry is trigonal-planar. 
C)  The electron-pair geometry is trigonal-planar,the molecular geometry is bent. 
D)  The electron-pair geometry is tetrahedral,the molecular geometry is tetrahedral. 
E)  The electron-pair geometry is tetrahedral,the molecular geometry is trigonal-pyramidal.

Question 9

Use VSEPR theory to predict the molecular geometry of BrO3-.

Accepted Answer

A)  trigonal-pyramidal 
B)  trigonal-planar 
C)  bent 
D)  T-shaped 
E)  linear 
A)  trigonal-pyramidal 
B)  trigonal-planar 
C)  bent 
D)  T-shaped 
E)  linear

Question 10

What is the correct Lewis structure for SF4?

Accepted Answer

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

Question 11

In molecules,as bond order increases,

Accepted Answer

A)  both bond length and bond energy increase. 
B)  both bond length and bond energy decrease. 
C)  bond length increases and bond energy is unchanged. 
D)  bond length is unchanged and bond energy increases. 
E)  bond length decreases and bond energy increases. 
A)  both bond length and bond energy increase. 
B)  both bond length and bond energy decrease. 
C)  bond length increases and bond energy is unchanged. 
D)  bond length is unchanged and bond energy increases. 
E)  bond length decreases and bond energy increases.

Question 12

The molecular geometry of a molecule whose central atom has four single bonds and one lone pair of electrons is ________.

Accepted Answer

trigonal-b

Question 13

Which of the following has a Lewis structure similar to CS2?

Accepted Answer

A)  NH2- 
B)  O3 
C)  NO2- 
D)  SO2 
E)  ClO2- 
A)  NH2- 
B)  O3 
C)  NO2- 
D)  SO2 
E)  ClO2-

Question 14

When both of the electrons in a molecular bond originate from the same atom,the bond is called a(n)

Accepted Answer

A)  sigma bond. 
B)  coordinate covalent bond. 
C)  pi bond. 
D)  metallic bond. 
E)  ionic bond. 
A)  sigma bond. 
B)  coordinate covalent bond. 
C)  pi bond. 
D)  metallic bond. 
E)  ionic bond.

Question 15

One resonance structure for OCN- ion is drawn below.What is the formal charge on each atom?

Accepted Answer

A)  O atom = 0,C atom = 0,and N atom = 0 
B)  O atom = 0,C atom = 0,and N atom = -1 
C)  O atom = -1,C atom = 0,and N atom = 0 
D)  O atom = -1,C atom = -1,and N atom = +1 
E)  O atom = +1,C atom = 0,and N atom = -2 
A)  O atom = 0,C atom = 0,and N atom = 0 
B)  O atom = 0,C atom = 0,and N atom = -1 
C)  O atom = -1,C atom = 0,and N atom = 0 
D)  O atom = -1,C atom = -1,and N atom = +1 
E)  O atom = +1,C atom = 0,and N atom = -2

Question 16

An atom of Se has ____ valence electrons.

Accepted Answer

A)  2 
B)  6 
C)  4 
D)  3 
E)  8 
A)  2 
B)  6 
C)  4 
D)  3 
E)  8

Question 17

Which of the following is/are true concerning formal charge?
1)The formal charge of each individual atom in a molecule or ion is an actual atomic charge that can be experimentally determined.
2)The formal charge of each individual atom is always the same for each possible resonance form.
3)The sum of the formal charges of each atom in a molecule or ion equal the overall charge of the molecule or ion.

Accepted Answer

A)  1 only 
B)  2 only 
C)  3 only 
D)  1 and 2 
E)  1 and 3 
A)  1 only 
B)  2 only 
C)  3 only 
D)  1 and 2 
E)  1 and 3

Exam 9: Bonding and Molecular Structure

Which of the following is a correct Lewis electron-dot formula for CO?

Choose which central atom in the following molecules is most electronegative.

Place the following molecules in order from smallest to largest H-N-H bond angles: NH4+,NH3,and NH2-.

What are the approximate H-N-H bond angles in NH4+?

Which of the following groups contains no ionic compounds?

The following representation of an atom is called

Use VSEPR theory to predict the molecular geometry around the nitrogen atom in nitrite ion,NO2-.

Use VSEPR theory to predict the electron-pair geometry and the molecular geometry of nitrogen trichloride,NCl3.

Use VSEPR theory to predict the molecular geometry of BrO3-.

What is the correct Lewis structure for SF4?

In molecules,as bond order increases,

The molecular geometry of a molecule whose central atom has four single bonds and one lone pair of electrons is ________.

Which of the following has a Lewis structure similar to CS2?

When both of the electrons in a molecular bond originate from the same atom,the bond is called a(n)

One resonance structure for OCN- ion is drawn below.What is the formal charge on each atom?

An atom of Se has ____ valence electrons.

Basic Concepts of Chemistry

Mathlets Review: The Tools of Quantitative Chemistry

Atoms, molecules, and Ions

Chemical Reactions

Stoichiometry: Quantitative Information About Chemical Reactions

Principles of Chemical Reactivity: Energy and Chemical Reactions

The Structure of Atoms

The Structure of Atoms and Periodic Trends

Bonding and Molecular Structure: Orbital Hybridization and Molecular Orbitals

Gases and Their Properties

Intermolecular Forces and Liquids

The Chemistry of Solids

Solutions and Their Behavior

Chemical Kinetics: the Rates of Chemical Reactions

Principles of Reactivity: Chemical Equilibria

The Chemistry of Acids and Bases

Principles of Reactivity: Other Aspects of Aqueous Equilibria

Entropy and Free Energy

Principles of Reactivity: Electron Transfer Reactions

Environmental Chemistry Earths Environment,energy,and Sustainability

The Chemistry of the Main Group Elements

The Chemistry of the Transition Elements

Carbon: Not Just Another Element

Biochemistry

Nuclear Chemistry

Filters

Place the following molecules in order from smallest to largest H-N-H bond angles: NH₄⁺,NH₃,and NH₂^-.

What are the approximate H-N-H bond angles in NH₄⁺?

Use VSEPR theory to predict the molecular geometry around the nitrogen atom in nitrite ion,NO₂^-.

Use VSEPR theory to predict the electron-pair geometry and the molecular geometry of nitrogen trichloride,NCl₃.

Use VSEPR theory to predict the molecular geometry of BrO₃^-.

What is the correct Lewis structure for SF₄?

Which of the following has a Lewis structure similar to CS₂?

One resonance structure for OCN^- ion is drawn below.What is the formal charge on each atom?