Relates lattice energies of ionic compounds to ionization energies, electron affinities, and other atomic and molecular properties.
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Triple Bond
Front
Two atoms share three pairs of electrons.
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Multiple Bonds
Front
Bonds formed when two atoms share two or more pairs of electrons.
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Electronegativity
Front
The ability of an atom to attract toward itself the electrons in a chemical bond.
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Bond Enthalpy
Front
The enthalpy change required to break a particular bond in one mole of gaseous molecules.
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Bond Length
Front
The distance between the nuclei of two covalently bonded atoms in a molecule.
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Single Bond
Front
Two atoms are held together by one electron pair.
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Lewis Dot Symbol
Front
Consists of the symbol of an element and one dot for each valence electron in an atom of the element.
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Double Bond
Front
Two atoms share two pairs of electrons.
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Polar Covalent Bond
Front
The electrons spend more time in the vicinity of one atom than the other.
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∆H° = ∑BE(reactants) - ∑BE(products)
= total energy input - total energy released
BE stands for average bond enthalpy
∑ is the summation sign
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Equation for Calculating Enthalpy Change of a Reaction from Bond Enthalpies
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Formal Charge
Front
The electrical charge difference between the valence electrons in an isolated atom and the number of electrons assigned to that atom in a lewis structure.
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Electronegativity Trend
Front
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Lewis Structure
Front
A representation of covalent bonding in atoms in which shared electron pairs are shown either as lines or as pairs of dots between two atoms, and lone pairs are shown as pairs of dots on individual atoms.
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Resonance Structure
Front
One of two or more lewis structures for a single molecule that cannot be represented accurately by only one lewis structure.
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Lone Pairs
Front
Pairs of valence electrons that are not involved in covalent bond formation.
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Born-Haber Cycle Example
Front
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E α Q_+ x Q_- / r
= k x Q_+ x Q_- / r
Q are a positive and negative ion
k is the proportionality constant
r is the distance
E is potential energy
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Coulomb's Law
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Ionic Bond
Front
The electrostatic force that holds ions together in an ionic compound.
Some Bond Enthalpies of Diatomic Molecules and Average Bond Enthalpies for Bonds in Polyatomic Molecules
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Resonance
Front
The use of two or more lewis structures to represent a particular molecule.
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Covalent Compounds
Front
Compounds that contain only covalent bonds.
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Covalent Bond
Front
A bond in which two electrons are shared by two atoms.
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Coordinate Covalent Bond
Front
A covalent bond in which one of the atoms donates both electrons.
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Octet Rule
Front
An atom other than hydrogen tends to form bonds until it is surrounded by eight valence electrons.
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Coulomb's Law
Front
The potential energy (E) between two ions is directly proportional to the product of their changes and inversely proportional to the distance of separation between them.