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The heat content of a specific amount of substance, defined as E= PV.

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Hard Water

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

Concentration

Amount of solute per unit volume or mass of solvent or of solution.

Nuclear Reaction

Involves a change in the composition of a nucleus and can evolve or absorb an extraordinarily large amount of energy.

Aufbau ('building up') Principle

Describes the order in which electrons fill orbitals in atoms.

Specific Heat

The amount of heat required to raise the temperature of one gram of substance one degree Celsius.

Distilland

The material in a distillation apparatus that is to be distilled.

Single Bond

Covalent bond resulting from the sharing of two electrons (one pair) between two atoms.

Fat

Solid triester of glycerol and (mostly) saturated fatty acids.

Periodic Table

An arrangement of elements in order of increasing atomic numbers that also emphasizes periodicity.

xenon

A heavy, colorless, chemically inactive, monatomic gaseous element used for filling radio, television, and luminescent tubes. Symbol: Xe, at. wt.: 131.30, at. no.: 54.