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Refers to the separation of charge between two covalently bonded atoms.

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Molecular Weight

The mass of one molecule of a nonionic substance in atomic mass units.

Le Chatelier's Principle

States that a system at equilibrium, or striving to attain equilibrium, responds in such a way as to counteract any stress placed upon it.
If a stress (change of conditions) is applied to a system at equilibrium, the system shifts in the direction that reduces stress.

Ore

A natural deposit containing a mineral of an element to be extracted.

Dumas Method

A method used to determine the molecular weights of volatile liquids.

Ion

An atom or a group of atoms that carries an electric charge.

Osmotic Pressure

The hydrostatic pressure produced on the surface of a semipermable membrane by osmosis.

Hydrogen-Oxygen Fuel Cell

Fuel cell in which hydrogen is the fuel (reducing agent) and oxygen is the oxidizing agent.

 

Safranine

Also called "phenosafranine". A purplish-red, water-soluble dye, C18H14N4, used for textiles and as a stain in microscopy.

Heat of Crystallization

The amount of heat that must be removed from one gram of a liquid at its freezing point to freeze it with no change in temperature.

Concentration

Amount of solute per unit volume or mass of solvent or of solution.