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The particle pressure of a vapor at the surface of its parent liquid.

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Double Bond

Covalent bond resulting from the sharing of four electrons (two pairs) between two atoms.

Frasch Process

Method by which elemental sulfur is mined or extracted. Sulfur is melted with superheated water (at 170°C under high pressure) and forced to the surface of the earth as a slurry.

 

Nuclide Symbol

Symbol for an atom A/Z E, in which E is the symbol of an element, Z is its atomic number, and A is its mass number.

Photochemical Oxidants

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

Optical Activity

The rotation of plane polarized light by one of a pair of optical isomers.

 

Born-Haber Cycle

A series of reactions (and accompanying enthalpy changes) which, when summed, represents the hypothetical one-step reaction by which elements in their standard states are converted into crystals of ionic compounds (and the accompanying enthalpy changes.)

Coordination Isomers

Isomers involving exchanges of ligands between complex cation and complex anion of the same compound.

Nitrogen Cycle

The complex series of reactions by which nitrogen is slowly but continually recycled in the atmosphere, lithosphere and hydrosphere.

 

Effective Molality

The sum of the molalities of all solute particles in a solution.

Particulate Matter

Fine divided solid particles suspended in polluted air.