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Substances consisting largely of hydrocarbons, derived from decay of organic materials under geological conditions of high pressure and temperature (metamorphism) include coal, petroleum, natural gas, peat and oil shale.  For further information see Fuel Chemistry

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Hydrate Isomers

Isomers of crystalline complexes that differ in whether water is present inside or outside the coordination sphere.

ytterbia

Ytterbia is a colorless compound, Yb2O3, used in certain alloys and ceramics. Also known as ytterbium oxide.

Aryl Group

Group of atoms remaining after a hydrogen atom is removed from the aromatic system.

Fat

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

Amine

Derivatives of ammonia in which one or more hydrogen atoms have been replaced by organic groups.

Allotropes

Different forms of the same element in the same physical state.

End Point

The point at which an indicator changes colour and a titration is stopped.

Saccharide

An organic compound containing a sugar or sugars.

Mass

A measure of the amount of matter in an object. Mass is usually measured in grams or kilograms.

Ternary Acid

A ternary compound containing H, O, and another element, often a nonmetal.