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Change in the concentration of a reactant or product per unit time.

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Supercritical Fluid

A substance at temperature above its critical temperature.

Condensed States

The solid and liquid states.

Atomic Number


Integral number of protons in the nucleus, defines the identity of element.
 

Greenhouse Effect

Trapping of heat at the surface of the earth by carbon dioxide and water vapour in the atmosphere.

Atomic Radius

Radius of an atom.

Pauli Exclusion Principle

No two electrons in the same atom may have identical sets of four quantum numbers.

Downs Cell

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

Heat

A form of energy that flows between two samples of matter because of their differences in temperature.

Hydrogen Bond

A fairly strong dipole-dipole interaction (but still considerably weaker than the covalent or ionic bonds) between molecules containing hydrogen directly bonded to a small, highly electronegative atom, such as N, O, or F.

Evaporization

Vaporization of a liquid below its boiling point.