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Any of six colorless, crystalline, isomeric acids having the formula C9H10O2, derived from xylene.

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Isomers

Different substances that have the same formula.

Polymerization

The combination of many small molecules to form large molecules.

Standard Molar Enthalphy of Formation

The amount of heat absorbed in the formation of one mole of a substance in a specified state from its elements in their standard states.

Evaporation Rate

The rate at which a particular substance will vapourize (evaporate) when compared to the rate of a known substance such as ethyl ether. This term is especially useful for health and fire-hazard considerations.

Saponification

Hydrolysis of esters in the presence of strong soluable bases.

A brief history of dyeing fabrics

 Dyeing fabrics is giving the fibers a homogeneous color that has a certain degree of strength. The methods of dyeing are very diverse, depending on the properties of the dyes and the dyed fibers.

Isoelectric

Having the same electronic configurations.

Electronic Transition

The transfer of an electron from one energy level to another.

Percent Purity

The percent of a specified compound or element in an impure sample.

Heterogeneous Mixture

A mixture that does not have uniform composition and properties throughout.