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A group of atoms that represents a potential reaction site in an organic compound.

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Double Bond

Covalent bond resulting from the sharing of four electrons (two pairs) between two atoms.

Polarization

The buildup of a product of oxidation or a reduction of an electrode, preventing further reaction.

Polymorphous

Refers to substances that crystallize in more than one crystalline arrangement.

Coordination Isomers

Isomers involving exchanges of ligands between complex cation and complex anion of the same compound.

Hydrate

A solid compound that contains a definite percentage of bound water.

Net Ionic Equation

Equation that results from canceling spectator ions and eliminating brackets from a total ionic equation.

Valence Electrons

Outermost electrons of atoms, usually those involved in bonding.

Law of Combining Volumes (Gay-Lussac's Law)

At constant temperature and pressure, the volumes of reacting gases (and any gaseous products) can be expressed as ratios of small whole numbers.

 

Coordinate Covalent Bond

A covalent bond in which both shared electrons are donated by the same atom, a bond between a Lewis base and a Lewis acid.

Combustible

Classification of liquid substances that will burn on the basis of flash points. A combustible liquid means any liquid having a flash point at or above 37.8°C (100°F) but below 93.3°C (200°F), except any mixture having components with flash points of 93.3°C (200°F) or higher, the total of which makes up 99 percent or more of the total volume of the mixture.