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A packet of light or electromagnetic radiation, also called quantum of light.

 

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Heat Capacity

The amount of heat required to raise the temperature of a body (of any mass) one degree Celsius.

Cation

A positive ion, an atom or group of atoms that has lost one or more electrons.

Emulsifying Agent

A sustance that coats the particles of the dispersed phase and prevents coagulation of colloidal particles, an emulsifier.

Dermal toxicity

Adverse health effects resulting from skin exposure ot a substance.

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.

 

Electrodes

Surfaces upon which oxidation and reduction half-reactions, occur in electrochemical cells.

Common Ion Effect

Suppression of ionization of a weak electrolyte by the presence in the same solution of a strong electrolyte containing one of the same ions as the weak electrolyte.

Collision Theory

Theory of reaction rates that states that effective collisions between reactant molecules must occur in order for the reaction to occur.

Integrated Rate Equation

An equation giving the concentration of a reactant remaining after a specified time, has different mathematical form for different orders of reactants.

Enthalpy

The heat content of a specific amount of substance, defined as E= PV.