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Refers to an optically active substance that rotates the plane of plane polarized light counterclockwise, also called levo.

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Alpha Particles

A helium nucleus.

Radical

An atom or group of atoms that contains one or more unpaired electrons (usually very reactive species)

Titration

A Procedure in which one solution is added to another solution until the chemical reaction between the two solutes is complete, the concentration of one solution is known and that of the other is unknown.

 

Gamma Ray

High energy electromagnetic radiation. A highly penetrating type of nuclear radiation similar to x-ray radiation, except that it comes from within the nucleus of an atom and has a higher energy. Energywise, very similar to cosmic ray except that cosmic rays originate from outer space.

xylan

The pentosan occurring in woody tissue that hydrolyzes to xylose: used as a source of furfural.

Halogens

Group VIIA elements: F, Cl, Br, I

Hydrate Isomers

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

Differential Thermometer

A thermometer used for accurate measurement of very small changes in temperature.

Downs Cell

Electrolytic cell for the commercial electrolysis of molten sodium chloride. For further information see Electrochemistry or Fuel Cells.

Linear Accelerator

A device used for accelerating charged particles along a straight line path.