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The arrangement of atoms (not lone pairs of electrons) around a central atom of a molecule or polyatomic ion.

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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.

 

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.)

Secondary Voltaic Cells

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

Indicators

For acid-base titrations, organic compounds that exhibit different colors in solutions of different acidities, used to determine the point at which reaction between two solutes is complete.

D -Transition elements (metals)

B Group elements except IIB in the periodic table, sometimes called simply transition elements EX. Fe, Ni, Cu, Ti .
For further information see Metals.

Heavy Water

Water containing deuterium, a heavy isotope of hydrogen.

Hydrogenation

The reaction in which hydrogen adds across a double or triple bond.

Amino Acid

Compound containing both an amino and a carboxylic acid group.The --NH2 group.

Dermal toxicity

Adverse health effects resulting from skin exposure ot a substance.

Limiting Reactant

Substance that stoichiometrically limits the amount of product(s) that can be formed.