UCF CHM Exam 3 Questions With Complete
Solutions
In the Lewis model - Correct Answer valence electrons are represented as dots, and we draw Lewis
electron-dot structures
metallic bonding - Correct Answer In the simplest model for metallic bonding—called the electron sea
model—all of the atoms in a metal lattice pool their valence electrons. These pooled electrons are no
longer localized on a single atom, but delocalized over the entire metal. The positively charged metal
atoms are then attracted to the sea of electrons, holding the metal together.
Lewis symbol - Correct Answer represent the valence electrons of main-group elements as dots
surrounding the element symbol
chemical bond - Correct Answer the sharing or transfer of electrons to attain stable electron
configurations for the bonding atoms
octet rule - Correct Answer bonding atoms attain stable electron configurations; since the stable
configuration is usually eight electrons in the outermost shell
lattice energy - Correct Answer the energy associated with the formation of a crystalline lattice of
alternating cations and anions from the gaseous ions
Born-Haber cycle - Correct Answer a hypothetical series of steps that represents the formation of an
ionic compound from its constituent elements
bonding pair - Correct Answer A shared pair of electrons
lone pair - Correct Answer pair that is associated with only one atom
nonbonding electrons - Correct Answer Lone pair electrons are also called
, double bond - Correct Answer When two atoms share two electron pairs
triple bond - Correct Answer are even shorter and stronger than double bonds
polar covalent bond - Correct Answer An intermediate in nature between a pure covalent bond and an
ionic bond
electronegativity - Correct Answer the ability of an atom to attract electrons to itself in chemical
bonding
dipole moment (μ) - Correct Answer Separation of Two Particles of Equal but Opposite Charge of
Magnitude q by a Distance r
percent ionic character - Correct Answer measured dipole moment of bond dipole moment if electron
were completely transferred × 100 %
resonance structures - Correct Answer one of two or more Lewis structures that have the same skeletal
formula (the atoms are in the same locations), but different electron arrangements
resonance hybrid - Correct Answer a combination or average of the contributing resonance structures.
formal charge - Correct Answer # of valence electrons - # of nonbonding electrons - # of bonds
free radical - Correct Answer Molecules and ions with an odd number of electrons in their Lewis
structures
bond energy - Correct Answer the energy required to break 1 mole of the bonds in the gas phase
bond length - Correct Answer represents the average length of a bond between two particular atoms in
a large number of compounds
Solutions
In the Lewis model - Correct Answer valence electrons are represented as dots, and we draw Lewis
electron-dot structures
metallic bonding - Correct Answer In the simplest model for metallic bonding—called the electron sea
model—all of the atoms in a metal lattice pool their valence electrons. These pooled electrons are no
longer localized on a single atom, but delocalized over the entire metal. The positively charged metal
atoms are then attracted to the sea of electrons, holding the metal together.
Lewis symbol - Correct Answer represent the valence electrons of main-group elements as dots
surrounding the element symbol
chemical bond - Correct Answer the sharing or transfer of electrons to attain stable electron
configurations for the bonding atoms
octet rule - Correct Answer bonding atoms attain stable electron configurations; since the stable
configuration is usually eight electrons in the outermost shell
lattice energy - Correct Answer the energy associated with the formation of a crystalline lattice of
alternating cations and anions from the gaseous ions
Born-Haber cycle - Correct Answer a hypothetical series of steps that represents the formation of an
ionic compound from its constituent elements
bonding pair - Correct Answer A shared pair of electrons
lone pair - Correct Answer pair that is associated with only one atom
nonbonding electrons - Correct Answer Lone pair electrons are also called
, double bond - Correct Answer When two atoms share two electron pairs
triple bond - Correct Answer are even shorter and stronger than double bonds
polar covalent bond - Correct Answer An intermediate in nature between a pure covalent bond and an
ionic bond
electronegativity - Correct Answer the ability of an atom to attract electrons to itself in chemical
bonding
dipole moment (μ) - Correct Answer Separation of Two Particles of Equal but Opposite Charge of
Magnitude q by a Distance r
percent ionic character - Correct Answer measured dipole moment of bond dipole moment if electron
were completely transferred × 100 %
resonance structures - Correct Answer one of two or more Lewis structures that have the same skeletal
formula (the atoms are in the same locations), but different electron arrangements
resonance hybrid - Correct Answer a combination or average of the contributing resonance structures.
formal charge - Correct Answer # of valence electrons - # of nonbonding electrons - # of bonds
free radical - Correct Answer Molecules and ions with an odd number of electrons in their Lewis
structures
bond energy - Correct Answer the energy required to break 1 mole of the bonds in the gas phase
bond length - Correct Answer represents the average length of a bond between two particular atoms in
a large number of compounds
