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Theory of reaction rates that states that effective collisions between reactant molecules must occur in order for the reaction to occur.

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Radioactivity

The spontaneous disintegration of atomic nuclei.

Hydrometer

A device used to measure the densities of liquids and solutions.

Critical Point

The combination of critical temperature and critical pressure of a substance.

Oxidation-reduction Reactions

Reactions in which oxidation and reduction occur, also called redox reactions.

Tyndall Effect

The scattering of light by colloidal particles.

Vapor

A gas formed by boiling or evaporating a liquid.

Downs Cell

Electrolytic cell for the commercial electrolysis of molten sodium chloride. For further information see Electrochemistry or Fuel Cells.

Extrapolate

To estimate the value of a result outside the range of a series of known values. Technique used in standard additions calibration procedure.

Law of Definite Proportions (Law of Constant Composition)

The law stating that a pure substance will always have the same percent by weight. Different samples of a pure compound always contain the same elements in the same proportions by mass.

Foam

Colloidal suspension of a gas in a liquid.