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The entropy of a hypothetical pure, perfect, crystalline sustance at absolute zero temperature is zero.

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Salt Bridge

A U-shaped tube containing electrolyte, which connects two half-cells of a voltaic cell.

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.

Conformations

Structures of a compound that differ by the extent of rotation about a single bond.

Ion Product for Water

Equilibrium constant for the ionization of water, Kw = [H3O+][OH-] =1.00 x 10-14 at 25 °C.

Primary Standard

A substance of a known high degree of purity that undergoes one invariable reaction with the other reactant of interest.

Law of Combining Volumes (Gay-Lussac's Law)

At constant temperature and pressure, the volumes of reacting gases (and any gaseous products) can be expressed as ratios of small whole numbers.

 

Greenhouse Effect

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

Substance

Any kind of matter all specimens of which have the same chemical composition and physical properties.

 

Amino Acid

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

Ketone

Compound in which a carbonyl group is bound to two alkyl or two aryl groups, or to one alkyl and one aryl group.