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A quantity that characterizes the position of equilibrium for a reversible reaction, its magnitude is equal to the mass action expression at equilibrium. K varies with temperature.

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Thermal Cracking

Decomposition by heating a substance in the presence of a catalyst and in the absence of air.

 

Conjugated Double Bonds

Double bonds that are separated from each other by one single bond -C=C-C=C-.

Chemical Change

A change in which one or more new substances are formed.

Detergent

A soap-like emulsifer that contains a sulfate, SO3 or a phosphate group instead of a carboxylate group.

Secondary Voltaic Cells

Voltaic cells that can be recharged, original reactanats can be regenerated be reversing the direction of the current flow.

Emission Spectrum

Spectrum associated with emission of electromagnetic radiation by atoms (or other species) resulting from electronic transitions from higher to lower energy states.

 

Mother Nuclide

Nuclide that undergoes nuclear decay.

Amorphous Solid

A noncrystalline solid with no well-defined ordered structure.

Colloid

A heterogeneous mixture in which solute-like particles do not settle out.

Ion

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