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Lewis Base

Any species that can make available a share in an electron pair.

Absolute Entropy (of a substance)




A compound containing an alkyl group bonded to a benzene ring.

Insoluble Compound

A very slightly soluble compound.

Shielding Effect

Electrons in filled sets of s , p orbitals between the nucleus and outer shell electrons shield the outer shell electrons somewhat from the effect of protons in the nucleus, also called screening effect.

Crystal Lattice

A pattern of arrangement of particles in a crystal.

Boiling Point

The temperature at which the vapor pressure of a liquid is equal to the applied pressure, also the condensation point


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

Ostwald Process

A process for the industrial production of nitrogen oxide and nitric acid from ammonia and oxygen.

Reverse Osmosis

Forcing solvent molecules to flow through a semipermable membrane from a concentated solution into a dilute solution by the application of greater hydrostatic pressure on concentrated side than the osmotic pressure opposing it.