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Basic Concepts of Chemical Bonding
Chemistry 1201: Chapter 8
25
Chemistry
Undergraduate 1
10/19/2012

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Term
Chemical Bonds
Definition
A way in which atoms interact with each other
Term
Ionic Bonds
Definition

 

Occurs when there is a complete transfer of electrons from one atom to another

Cation + Anion

 

 

Term
Covalent Bonds
Definition

Occurs when two atoms share electrons due to a partial transfer of electrons from one atom to another

Nonmetal + Nonmetal

Term
Metallic Bonds
Definition
Bonds shared between two metals
Term
Lewis Symbols (Lewis Dot)
Definition
The chemical symbol for an element with a dot for each valence electron
Term
Octet Rule
Definition
Atoms gain or lose electrons until they reach 8 valence electrons
Term
Lattice Energy
Definition
Energy required to completely separate a mole of a solid ionic compound into its gaseous ions
Term
Born-Haber Cycle
Definition
A thermodynamic cycle based on Hess's law that relates the lattice energy of an ionic substance to its enthalpy of formation and to other measurable quantities.
Term
Lewis Structure
Definition
A representation of covalent bonding in a molecule that is drawn using Lewis symbols
Term
Single, Double, and Triple Bonds
Definition

Single: 1 pair e-

Double: 2 pair e-

Triple: 3 pair e-

Term
Bond Polarity
Definition
A measure of the degree to which the electrons are shared unequally between atoms in a chemical bond
Term
Nonpolar Covalent Bond
Definition
A covalent bond in which the electrons are shared equally
Term
Polar Covalent Bonds
Definition
A covalent bond in which the electrons are not shared equally
Term
Electronegativity (EN)
Definition
The ability of an atom to attract shared electrons
Term
Polar Molecule
Definition
A molecule that posses a nonzero dipole moment
Term
Dipole
Definition
A molecule with one end having a partial negative charge and other end having a partial positive change
Term
Dipole Moment
Definition
A measure of a separation and magnitude of the positive and negative charges in polar molecules
Term
Formal Charge
Definition
The number if valence electrons in an isolated atom minus the nuber of electrons assigned to the atom in the Lewis structure
Term
Resonance Structures
Definition
Individual Lewis structures in cases where two or more Lewis structures are equally good description of a single molecule
Term
Bond Enthalpy
Definition
The enthalpy change, ΔH, required to break a particular bond when the substance is in the gas phase
Term
Valence Electrons
Definition
FOR MAIN GROUP ATOMS: Number of val e- = group number
Term
EN Trend
Definition

Closer to F = more EN

Closer to Fr = less EN

Term
Drawing Lewis Structures
Definition

1.) Calculate total number of valence electrons

2.) Determine arrangement

3.) Place one pair of electrons between each pair of bonded atoms to form a single bond

4.) Distributed the remaining electrons as lone pairs on terminal atoms

5.) Check to see if the octets are satisfied

6.) Calculate formula charges

Term
Formal Charge
Definition
Helps to determine which Lewis structure is the best
Term
# of val e- - (# lone pair e- + ½ * # bonding e-)
Definition
Formal Charge
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