Question 1

The Lewis dot symbol for the S 2- ion is

Accepted Answer

A)    
B)    
C)  S2- 
D)    
E)    
A)    
B)    
C)  S2- 
D)    
E)

Question 2

Which of the following solids would have the highest melting point

Accepted Answer

A)  NaI 
B)  NaF 
C)  MgO 
D)  MgCl2 
E)  KF 
A)  NaI 
B)  NaF 
C)  MgO 
D)  MgCl2 
E)  KF

Question 3

The following reaction correctly shows the chemical equation for which the enthalpy of reaction is the lattice energy of KCl(s).KCl(s) $\rarr$K+(g) + Cl - (g)

Accepted Answer

A) True 
 B)False

Question 4

The total number of bonding electrons in a molecule of formaldehyde (H2CO) is

Accepted Answer

A)  3. 
B)  4. 
C)  6. 
D)  8. 
E)  18. 
A)  3. 
B)  4. 
C)  6. 
D)  8. 
E)  18.

Question 5

What is the formal charge on the oxygen atom in N2O (the atomic order is N-N-O)

Accepted Answer

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

Question 6

The Lewis structure reveals a triple bond in which of the following molecules

Accepted Answer

A)  Br2 
B)  O2 
C)  N2 
D)  H2 
E)  CH4 
A)  Br2 
B)  O2 
C)  N2 
D)  H2 
E)  CH4

Question 7

The following Lewis structure for OF2 uses how many valence electrons

Accepted Answer

A)  16 
B)  18 
C)  20 
D)  zero 
E)  None of the above 
A)  16 
B)  18 
C)  20 
D)  zero 
E)  None of the above

Question 8

Nitrous oxide, N2O, is sometimes called "laughing gas". What is the formal charge on the central nitrogen atom in the most favorable Lewis structure for nitrous oxide based on minimizing formal charge overall (The atom connectivity is N-N-O.)

Accepted Answer

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

Question 9

In the Lewis structure of the iodate ion, IO3-, that satisfies the octet rule, the formal charge on the central iodine atom is

Accepted Answer

A)  +2. 
B)  +1. 
C)  0. 
D)  -1. 
E)  -2. 
A)  +2. 
B)  +1. 
C)  0. 
D)  -1. 
E)  -2.

Question 10

The number of resonance structures for the sulfur dioxide molecule that satisfy the octet rule is

Accepted Answer

A)  1. 
B)  2. 
C)  3. 
D)  4. 
E)  None of these. 
A)  1. 
B)  2. 
C)  3. 
D)  4. 
E)  None of these.

Question 11

Which one of the following is most likely to be a covalent compound

Accepted Answer

A)  Rb2O 
B)  BaO 
C)  SrO 
D)  SeO2 
E)  MnO2 
A)  Rb2O 
B)  BaO 
C)  SrO 
D)  SeO2 
E)  MnO2

Question 12

Use bond energies to estimate the enthalpy of formation of HBr(g).
BE(H-H) = 436 kJ/mol 
BE(Br-Br) = 192 kJ/mol
BE(H-Br) = 366 kJ/mol

Accepted Answer

A)  +262 kJ/mol 
B)  +104 kJ/mol 
C)  +52 kJ/mol 
D)  -52 kJ/mol 
E)  -104 kJ/mol 
A)  +262 kJ/mol 
B)  +104 kJ/mol 
C)  +52 kJ/mol 
D)  -52 kJ/mol 
E)  -104 kJ/mol

Question 13

How many covalent bonds will be drawn to bromine in BrO3- for the dot structure that expands the octet to minimize formal charge and if necessary places negative formal charges on the most electronegative atom(s)

Accepted Answer

A)  3 
B)  4 
C)  5 
D)  6 
E)  7 
A)  3 
B)  4 
C)  5 
D)  6 
E)  7

Question 14

The total number of valence electrons in the ion SO42- is

Accepted Answer

A)  24. 
B)  26. 
C)  28. 
D)  30. 
E)  32. 
A)  24. 
B)  26. 
C)  28. 
D)  30. 
E)  32.

Question 15

Which of the following covalent bonds is the most polar (i.e., highest percent ionic character)

Accepted Answer

A)  Al - I 
B)  Si - I 
C)  Al - Cl 
D)  Si - Cl 
E)  Si - P 
A)  Al - I 
B)  Si - I 
C)  Al - Cl 
D)  Si - Cl 
E)  Si - P

Question 16

List all types of bonding present in the compound CaCO3.
I. ionic bond 
II. polar covalent bond
III. nonpolar covalent bond

Accepted Answer

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

Exam 9: Chemical Bonding I: Basic Concepts

The Lewis dot symbol for the S 2- ion is

Which of the following solids would have the highest melting point

The following reaction correctly shows the chemical equation for which the enthalpy of reaction is the lattice energy of KCl(s).KCl(s) →\rarr→ K+(g) + Cl - (g)

The total number of bonding electrons in a molecule of formaldehyde (H2CO) is

What is the formal charge on the oxygen atom in N2O (the atomic order is N-N-O)

The Lewis structure reveals a triple bond in which of the following molecules

The following Lewis structure for OF2 uses how many valence electrons

Nitrous oxide, N2O, is sometimes called "laughing gas". What is the formal charge on the central nitrogen atom in the most favorable Lewis structure for nitrous oxide based on minimizing formal charge overall (The atom connectivity is N-N-O.)

In the Lewis structure of the iodate ion, IO3-, that satisfies the octet rule, the formal charge on the central iodine atom is

The number of resonance structures for the sulfur dioxide molecule that satisfy the octet rule is

Which one of the following is most likely to be a covalent compound

Use bond energies to estimate the enthalpy of formation of HBr(g). BE(H-H) = 436 kJ/mol BE(Br-Br) = 192 kJ/mol BE(H-Br) = 366 kJ/mol

How many covalent bonds will be drawn to bromine in BrO3- for the dot structure that expands the octet to minimize formal charge and if necessary places negative formal charges on the most electronegative atom(s)

The total number of valence electrons in the ion SO42- is

Which of the following covalent bonds is the most polar (i.e., highest percent ionic character)

List all types of bonding present in the compound CaCO3. I. ionic bond II. polar covalent bond III. nonpolar covalent bond

Chemistry: The Study of Change

Atoms Molecules and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solutions

Gases

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding II: Molecular Geometry and Hybridization of Atomic

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy Free Energy and Equilibrium

Electrochemistry

Nuclear Chemistry

Chemistry in the Atmosphere

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metals Chemistry and Coordination Compounds

Organic Chemistry

Synthetic and Natural Organic Polymers

Filters

The Lewis dot symbol for the S ^2- ion is

The following reaction correctly shows the chemical equation for which the enthalpy of reaction is the lattice energy of KCl(s).KCl(s) $\rarr$ K⁺(g) + Cl ^- (g)

The total number of bonding electrons in a molecule of formaldehyde (H₂CO) is

What is the formal charge on the oxygen atom in N₂O (the atomic order is N-N-O)

The following Lewis structure for OF₂ uses how many valence electrons

Nitrous oxide, N₂O, is sometimes called "laughing gas". What is the formal charge on the central nitrogen atom in the most favorable Lewis structure for nitrous oxide based on minimizing formal charge overall (The atom connectivity is N-N-O.)

In the Lewis structure of the iodate ion, IO₃^-, that satisfies the octet rule, the formal charge on the central iodine atom is

How many covalent bonds will be drawn to bromine in BrO₃^- for the dot structure that expands the octet to minimize formal charge and if necessary places negative formal charges on the most electronegative atom(s)

The total number of valence electrons in the ion SO₄^2- is

List all types of bonding present in the compound CaCO₃. I. ionic bond II. polar covalent bond III. nonpolar covalent bond