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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.

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Lewis Dot Formula (Electron Dot Formula)

Representation of the core of a molecule, ion or formula unit by showing atomic symbols and only outer shell electrons.

Dimer

Molecule formed by combination of two smaller (identical) molecules.

Emulsion

Colloidal suspension of a liquid in a liquid.

Reversible Reaction

Reactions that do not go to completion and occur in both the forward and reverse direction.

Associated Ions

Short-lived species formed by the collision of dissolved ions of opposite charges.

Hydration Energy

The energy change accompanying the hydration of a mole of gase and ions.

Heat of Vaporization

The amount of heat required to vaporize one gram of a liquid at its boiling point with no change in temperature. Usually expressed in J/g. The molar heat of vaporization is the amount of heat required to vaporize one mole of liquid at its boiling point with no change in temperature and usually expressed ion kJ/mol.

Electrolytic Conduction

Conduction of electrical current by ions through a solution or pure liquid.

Emulsifying Agent

A sustance that coats the particles of the dispersed phase and prevents coagulation of colloidal particles, an emulsifier.

Semipermable Membrane

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