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A solid compound that contains a definite percentage of bound water.

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Composition Stoichiometry

Descibes the quantitative (mass) relationships among elements in compounds.

Mother Nuclide

Nuclide that undergoes nuclear decay.

Chemical Change

A change in which one or more new substances are formed.

Alkyl Group

A group of atoms derived from an alkane by the removal of one hydrogen atom.

Foam

Colloidal suspension of a gas in a liquid.

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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.

Isomorphous

Refers to crystals having the same atomic arrangement.

Critical Mass

The minimum mass of a particular fissionable nuclide in a given volume required to sustain a nuclear chain reaction.

Chain Termination Step

The combination of two radicals, which removes the reactive species that propagate the change reaction.