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The range of concentrations over which a flammable vapour mixed with proper ratios of air will ignite or explode if a source of ignitions is provided.

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Periodic Law

The properties of the elements are periodic functions of their atomic numbers.

Autoionization

An ionization reaction between identical molecules.

Boiling Point Elevation

The increase in the boiling point of a solvent caused by the dissolution of a nonvolatile solute.

Aryl Group

Group of atoms remaining after a hydrogen atom is removed from the aromatic system.

Heisenberg Uncertainty Principle

It is impossible to determine accurately both the momentum and position of an electron simultaneously.

Ground State

The lowest energy state or most stable state of an atom, molecule or ion.

Primary Standard

A substance of a known high degree of purity that undergoes one invariable reaction with the other reactant of interest.

Ternary Compound

A compound consisting of three elements, may be ionic or covalent.

Nernst Equation

Corrects standard electrode potentials for nonstandard conditions.

Reaction Quotient

The mass action expression under any set of conditions (not necessarily equlibrium), its magnitude relative to K determines the direction in which the reaction must occur to establish equilibrium.