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The number of moles of a component of a mixture divided by the total number of moles in the mixture.

 

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Radioactive Dating

Method of dating ancient objects by determining the ratio of amounts of mother and daughter nuclides present in an object and relating the ratio to the object?s age via half-life calculations.

yttrium metal

Any of a subgroup of rare-earth elements, of which the cerium and terbium metals comprise the other two subgroups.

Chemical Kinetics

The study of rates and mechanisms of chemical reactions and of the factors on which they depend.

Functional Group

A group of atoms that represents a potential reaction site in an organic compound.

Metalloids

Elements with properties intermediate between metals and nonmetals: B, Al, Si, Ge, As, Sb, Te, Po, and At.

xylene

Any of three oily, colorless, water-insoluble, flammable, toxic, isomeric liquids, C8H10, of the benzene series, obtained mostly from coal tar: used chiefly in the manufacture of dyes.

Thermal Cracking

Decomposition by heating a substance in the presence of a catalyst and in the absence of air.

 

Coordinate Covalent Bond

A covalent bond in which both shared electrons are donated by the same atom, a bond between a Lewis base and a Lewis acid.

Valence Electrons

Outermost electrons of atoms, usually those involved in bonding.

Alloying

Mixing of metal with other substances (usually other metals) to modify its properties.