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Covalent bond in which electron density is symmetrically distributed.

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Fluorescence

Absorption of high energy radiation by a substance and subsequent emission of visible light.

Boyle's Law

At constant temperature the volume occupied by a definite mass of a gas is inversely proportional to the applied pressure.

Heat of Fusion

The amount of heat required to melt one gram of solid at its melting point with no change in temperature. Usually expressed in J/g. The molar heat of fusion is the amount of heat required to melt one mole of a solid at its melting point with no change in temperature and is usually expressed in kJ/mol.

Polymerization

The combination of many small molecules to form large molecules.

Insulator

Poor electric and heat conductor.

Salicylate

A salt or ester of salicylic acid.

Electromotive Series

The relative order of tendencies for elements and their simple ions to act as oxidizing or reducing agents, also called the activity series.

Band

A series of very closely spaced, nearly continuous molecular orbitals that belong to the crystal as a whole.

Melting Point

The temperature at which liquid and solid coexist in equilibrium, also the freezing point.

Composition Stoichiometry

Descibes the quantitative (mass) relationships among elements in compounds.