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A protein that acts as a catalyst in biological systems.

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Positron

A Nuclear particle with the mass of an electron but opposite charge.

Gel

Colloidal suspension of a solid dispersed in a liquid, a semirigid solid.

Flammable

A liquid as defined by NFPD and DOT as having a flash point below 37.8°C (100°F).

Bond Order

Half the numbers of electrons in bonding orbitals minus half the number of electrons in antibonding orbitals. Bond order gives an indication to the stability of a bond. Also defined as the difference between the number of bonding electrons and antibonding electrons divided by two.

Boiling Point Elevation

The increase in the boiling point of a solvent caused by the dissolution of a nonvolatile solute.

Molecular Geometry

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

Enantiomer

One of the two mirror-image forms of an optically active molecule.

Differential Thermal Analysis (DTA)

A technique for observing the temperature, direction, and magnitude of thermally induced transitions in a material by heating/cooling a sample and comparing its temperature with that of an inert reference material under similar conditions.

Solvent

The dispersing medium of a solution.

Hydrogenation

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