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The direct solidification of a vapor by cooling, the reverse of sublimation.

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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.

Matter

Anything that has mass and occupies space.

Saccharide

An organic compound containing a sugar or sugars.

xenon tetrafluoride

A colorless, crystalline compound, XeF4, prepared by heating a gaseous mixture of fluorine and xenon.

Thermodynamics

The study of the energy transfers accompanying physical and chemical processes.

Homonuclear

Consisting of only one element.

Emulsifying Agent

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

Capillary

A tube having a very small inside diameter.

Electron Affinity

The amount of energy absorbed in the process in which an electron is added to a neutral isolated gaseous atom to form a gaseous ion with a 1- charge, has a negative value if energy is released.

Beta Particle

Electron emitted from the nucleus when a neuton decays to a proton and an electron.