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Any of a group of dyes having a molecular structure related to that of xanthene in which the aromatic (C6H4) groups are the chromophore.

 

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Ester

A Compound of the general formula R-C-O-R1 where R and R1 may be the same or different, and may be either aliphatic or aromatic.

Hydride

A binary compound of hydrogen.

 

Overlap

The interaction of orbitals on different atoms in the same region of space.

Acid Anhydride

Compound produced by dehydration of a carbonic acid. General formula is R--C--O--C--R. Chemical compound that reacts with water to form an acid and are usually oxides of nonmetallic elements.

Metathesis Reactions

Reactions in which two compounds react to form two new compounds, with no changes in oxidation number. Reactions in which the ions of two compounds exchange partners.

 

Rate-determining Step

The slowest step in a mechanism, the step that determines the overall rate of reaction.

Ionic Compounds

Compounds containing predominantly ionic bonding.

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.

Formula Unit

The smallest repeating unit of a substance. The molecule for nonionic substances

Half-Reaction

Either the oxidation part or the reduction part of a redox reaction.