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Equilibrium constant for the ionization of a weak electrolyte.

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xenon trioxide

A colorless, nonvolatile solid, XeO3, explosive when dry: in solution it is called xenic acid.

Downs Cell

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

Heat of Crystallization

The amount of heat that must be removed from one gram of a liquid at its freezing point to freeze it with no change in temperature.

Fluids

Substances that flow freely, gases and liquids.

ytterbium

A rare metallic element found in gadolinite and forming compounds resembling those of yttrium. Symbol: Yb, at. wt.: 173.04, at. no.: 70, sp. gr.: 6.96. Cf."rare-earth element."

 

Particulate Matter

Fine divided solid particles suspended in polluted air.

Central Atom

An atom in a molecule or polyatomic ion that is bonded to more than one other atom.

Film badge

A small patch of photographic film worn on clothing to detect and measure accumulated incident ionizing radiation.

Solvolysis

The reaction of a substance with the solvent in which it is dissolved.

Hard Water

Water containing Fe3+, Ca2+, and Mg2+ ions, which forms precipates with soap.