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A brownish smog occurring in urban areas receiving large amounts of sunlight, caused by photochemical (light-induced) reactions among nitrogen oxides, hydrocarbons and other components of polluted air that produce photochemical oxidants.

 

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Chain Termination Step

The combination of two radicals, which removes the reactive species that propagate the change reaction.

Molar Solubility

Number of moles of a solute that dissolve to produce a litre of saturated solution.

Evaporization

Vaporization of a liquid below its boiling point.

Ampere

Unit of electrical current, one ampere equals one coulomb per second.

 

Degenerate

Of the same energy.

Phenol

Hydrocarbon derivative containing an [OH] group bound to an aromatic raing.

 

Weak Electrolyte

A substance that conducts electricity poorly in a dilute aqueous solution.

Buffer Solution

Solution that resists change in pH, contains either a weak acid and a soluble ionic salt of the acid or a weak base and a soluble ionic salt of the base.

Band

A series of very closely spaced, nearly continuous molecular orbitals that belong to the crystal as a whole.

Carbanion

An organic ion carrying a negative charge on a carbon atom.