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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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Exothermic

Describes processes that release heat energy.

Saponification

Hydrolysis of esters in the presence of strong soluable bases.

Photochemical Oxidants

Photochemically produced oxidizing agents capable of causing damage to plants and animals.

Gel

Colloidal suspension of a solid dispersed in a liquid, a semirigid solid.

Acidic Salt

A salt containing an ionizable hydrogen atom. Acidic salt does not necessarily produce acidic solutions.

Concentration

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

A brief history of dyeing fabrics

 Dyeing fabrics is giving the fibers a homogeneous color that has a certain degree of strength. The methods of dyeing are very diverse, depending on the properties of the dyes and the dyed fibers.

Band Theory of Metals

Theory that accounts for the bonding and properties of metallic solids.

Greenhouse Effect

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

Extrapolate

To estimate the value of a result outside the range of a series of known values. Technique used in standard additions calibration procedure.