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A large molecule consisting of chains or rings of linked monomer units, usually characterized by high melting and boiling points.

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Formula

Combination of symbols that indicates the chemical composition of a substance.

 

Dextrorotatory

Refers to an optically active substance that rotates the plane of plane polarized light clockwise, also called dextro.

ytterbium

A rare metallic element found in gadolinite and forming compounds resembling those of yttrium. Symbol: Yb, at. wt.: 173.04, at. no.: 70, sp. gr.: 6.96. Cf."rare-earth element."

 

Chemical Periodicity

The variations in properties of elements with their position in the periodic table.

Linkage Isomers

Isomers in which a particular ligand bonds to a metal ion through different donor atoms.

 

Spectral Line

Any of a number of lines corresponding to definite wavelengths of an atomic emission or absorption spectrum, represents the energy difference between two energy levels.

 

Carbanion

An organic ion carrying a negative charge on a carbon atom.

Atomic Mass Unit (amu)

One twelfth of a mass of an atom of the carbon-12 isotope, a unit used for stating atomic and formula weights, also called dalton.

Gem-dimethyl group

Two methyl groups of the same carbon atom.

Specific Heat

The amount of heat required to raise the temperature of one gram of substance one degree Celsius.

Common Ion Effect

Suppression of ionization of a weak electrolyte by the presence in the same solution of a strong electrolyte containing one of the same ions as the weak electrolyte.

Heat of Solution

The amount of heat absorbed in the formation of solution that contains one mole of solute, the value is positive if heat is absorbed (endothermic) and negative if heat is released (exothermic).

DP number

The degree of polymerization, the average number of monomer units per polymer unit.

Chain Termination Step

The combination of two radicals, which removes the reactive species that propagate the change reaction.

Neutralization

The reaction of an acid with a base to form a salt and water. Usually, the reaction of hydrogen ions with hydrogen ions to form water molecules.

Secondary Voltaic Cells

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

xylose

A colorless, crystalline pentose sugar, C5H10O5, derived from xylan, straw, corncobs, etc., by treating with heated dilute sulfuric acid, and dehydrating to furfural if stronger acid is used.

Equilibrium or Chemical Equilibrium

A state of dynamic balance in which the rates of forward and reverse reactions are equal, the state of a system when neither forward or reverse reaction is thermodynamically favored.

Haber Process

A process for the catalyzed industrial production of ammonia from N2 and H2 at high temperature and pressure.

Outer Orbital Complex

Valence bond designation for a complex in which the metal ion utilizes d orbitals in the outermost (occupied) shell in hybridization.