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A highly reactive chemical species carrying no charge and having a single unpaired electron in an orbital.

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Effective Collisons

Collision between molecules resulting in a reaction, one in which the molecules collide with proper relative orientations and sufficient energy to react.

 

Photoelectric Effect

Emission of an electron from the surface of a metal caused by impinging electromagnetic radiation of certain minimum energy, current increases with increasing intensity of radiation.

 

Wild patina, is it so bad?

Usually this kind of patina appears on monuments. The most striking example is the Statue of Liberty in New York.

Explosive limits

The range of concentrations over which a flammable vapour mixed with proper ratios of air will ignite or explode if a source of ignitions is provided.

Lanthanides

Elements 58 to 71 (after lanthanum).

Alkynes

Unsaturated hydrocarbons that contain one or more carbon-carbon triple bonds.

Solution

Homogeneous mixture of two or more substances.

Photochemical Smog

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.

 

Lead Storage Battery

Secondary voltaic cell used in most automobiles.

Precipitate

An insoluble solid formed by mixing in solution the constituent ions of a slightly soluble solution.