,CHEM 103 Module 5 | Exam study Questions and Answers + Rationales | 2026/27 Updates |
100% correct
1. Which of the following types of bonds is formed when two oppositely charged ions attract
each other?
A) Covalent bond
B) Polar covalent bond
C) Ionic bond
D) Hydrogen bond
Correct Answer: Ionic bond
Rationale: An ionic bond is the electrostatic attraction between two oppositely charged ions,
typically formed when a metal loses electrons (becoming a cation) and a nonmetal gains
electrons (becoming an anion) . This is distinct from a covalent bond, which involves sharing
electrons.
2. Which of the following describes a covalent bond?
A) Transfer of electrons from one atom to another
B) Equal sharing of at least one pair of electrons
C) Unequal sharing of at least one pair of electrons
D) Attraction between a metal and a nonmetal ion
Correct Answer: Equal sharing of at least one pair of electrons
Rationale: A covalent bond is formed when two atoms share at least one pair of electrons so
that both atoms can achieve a full valence shell, typically satisfying the octet rule . The sharing is
characterized by the mutual attraction of both nuclei for the shared electrons.
,3. In a polar covalent bond, electrons are shared:
A) Equally between the two atoms
B) Unequally, with a difference in electronegativity between 0.5 and 1.6
C) Completely transferred to one atom
D) Only when the atoms are identical
Correct Answer: Unequally, with a difference in electronegativity between 0.5 and 1.6
Rationale: A polar covalent bond occurs when there is an unequal sharing of electrons due to a
difference in the atoms' electronegativities. The general range for a polar covalent bond is an
electronegativity difference between 0.5 and 1.6 .
4. What electronegativity difference is characteristic of a nonpolar covalent bond?
A) Greater than 1.6
B) Between 0.5 and 1.6
C) Less than 0.5
D) Exactly 1.0
Correct Answer: Less than 0.5
Rationale: A nonpolar covalent bond is characterized by an equal sharing of electrons between
atoms, which occurs when the electronegativity difference is very small, typically less than 0.5 .
For example, the bond between two identical atoms would have a difference of 0.
5. What is the relationship between electronegativity difference and bond type for a difference
greater than 1.6?
, A) Nonpolar covalent
B) Polar covalent
C) Ionic
D) Metallic
Correct Answer: Ionic
Rationale: An ionic bond is formed when the electronegativity difference between two atoms is
large, generally greater than 1.6 . This large difference results in a transfer of electrons from the
less electronegative atom (typically a metal) to the more electronegative atom (a nonmetal).
6. Which of the following properties is typical of ionic compounds?
A) Low boiling point
B) Solubility in nonpolar solvents
C) High melting point
D) Poor electrical conductivity when dissolved in water
Correct Answer: High melting point
Rationale: Ionic compounds have strong electrostatic attractions between ions, requiring a large
amount of energy to overcome these forces, which results in high melting and boiling points .
They are typically soluble in polar solvents (like water) and conduct electricity when dissolved.
7. Which of the following correctly ranks intermolecular forces from strongest to weakest?
A) Hydrogen bonding > Dipole-dipole > London dispersion
B) London dispersion > Dipole-dipole > Hydrogen bonding
C) Dipole-dipole > Hydrogen bonding > London dispersion
100% correct
1. Which of the following types of bonds is formed when two oppositely charged ions attract
each other?
A) Covalent bond
B) Polar covalent bond
C) Ionic bond
D) Hydrogen bond
Correct Answer: Ionic bond
Rationale: An ionic bond is the electrostatic attraction between two oppositely charged ions,
typically formed when a metal loses electrons (becoming a cation) and a nonmetal gains
electrons (becoming an anion) . This is distinct from a covalent bond, which involves sharing
electrons.
2. Which of the following describes a covalent bond?
A) Transfer of electrons from one atom to another
B) Equal sharing of at least one pair of electrons
C) Unequal sharing of at least one pair of electrons
D) Attraction between a metal and a nonmetal ion
Correct Answer: Equal sharing of at least one pair of electrons
Rationale: A covalent bond is formed when two atoms share at least one pair of electrons so
that both atoms can achieve a full valence shell, typically satisfying the octet rule . The sharing is
characterized by the mutual attraction of both nuclei for the shared electrons.
,3. In a polar covalent bond, electrons are shared:
A) Equally between the two atoms
B) Unequally, with a difference in electronegativity between 0.5 and 1.6
C) Completely transferred to one atom
D) Only when the atoms are identical
Correct Answer: Unequally, with a difference in electronegativity between 0.5 and 1.6
Rationale: A polar covalent bond occurs when there is an unequal sharing of electrons due to a
difference in the atoms' electronegativities. The general range for a polar covalent bond is an
electronegativity difference between 0.5 and 1.6 .
4. What electronegativity difference is characteristic of a nonpolar covalent bond?
A) Greater than 1.6
B) Between 0.5 and 1.6
C) Less than 0.5
D) Exactly 1.0
Correct Answer: Less than 0.5
Rationale: A nonpolar covalent bond is characterized by an equal sharing of electrons between
atoms, which occurs when the electronegativity difference is very small, typically less than 0.5 .
For example, the bond between two identical atoms would have a difference of 0.
5. What is the relationship between electronegativity difference and bond type for a difference
greater than 1.6?
, A) Nonpolar covalent
B) Polar covalent
C) Ionic
D) Metallic
Correct Answer: Ionic
Rationale: An ionic bond is formed when the electronegativity difference between two atoms is
large, generally greater than 1.6 . This large difference results in a transfer of electrons from the
less electronegative atom (typically a metal) to the more electronegative atom (a nonmetal).
6. Which of the following properties is typical of ionic compounds?
A) Low boiling point
B) Solubility in nonpolar solvents
C) High melting point
D) Poor electrical conductivity when dissolved in water
Correct Answer: High melting point
Rationale: Ionic compounds have strong electrostatic attractions between ions, requiring a large
amount of energy to overcome these forces, which results in high melting and boiling points .
They are typically soluble in polar solvents (like water) and conduct electricity when dissolved.
7. Which of the following correctly ranks intermolecular forces from strongest to weakest?
A) Hydrogen bonding > Dipole-dipole > London dispersion
B) London dispersion > Dipole-dipole > Hydrogen bonding
C) Dipole-dipole > Hydrogen bonding > London dispersion
