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

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Heterocyclic Amine

Amine in which the nitrogen is part of a ring.

Nonpolar Bond

Covalent bond in which electron density is symmetrically distributed.

Semipermable Membrane

A thin partition between two solutions through which certain molecules can pass but others cannot.

Valence Shell Electron Pair Repulsion Theory

Assumes that electron pairs are arranged around the central element of a molecule or polyatomic ion so that there is maximum separation (and minimum repulsion) among regions of high electron density.

 

Biodegradability

The ability of a substance to be broken down into simpler substances by bacteria.

 

Condensed Phases

The liquid and solid phases, phases in which particles interact strongly.

Ligand

A Lewis base in a coordination compound.

Standard Molar Volume

The volume occupied by one mole of an ideal gas under standard conditions, 22.4liters.

Total Ionic Equation

Equation for a chemical reaction written to show the predominant form of all species in aqueous solution or in contact with water.

Hess' Law of Heat Summation

The enthalpy change for a reaction is the same whether it occurs in one step or a series of steps.