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

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Molecular Geometry

The arrangement of atoms (not lone pairs of electrons) around a central atom of a molecule or polyatomic ion.

Potential Energy

Energy that matter possesses by virtue of its position, condition or composition.

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.

Nernst Equation

Corrects standard electrode potentials for nonstandard conditions.

Open Sextet

Refers to species that have only six electrons in the highest energy level of the central element (many Lewis acids).

Extensive Property

A property that depends upon the amount of material in a sample.

Homogeneous Catalyst

A catalyst that exists in the same phase (solid, liquid or gas) as the reactants. The process is called Homogeneous Catalysis.

Heat

A form of energy that flows between two samples of matter because of their differences in temperature.

Photoelectric Effect

Emission of an electron from the surface of a metal caused by impinging electromagnetic radiation of certain minimum energy, current increases with increasing intensity of radiation.

 

Atomic Mass Unit (amu)

One twelfth of a mass of an atom of the carbon-12 isotope, a unit used for stating atomic and formula weights, also called dalton.