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An experimentally determined (proportionality) constant, which is different for different reactions and which changes only with temperature, k in the rate-law expression: Rate = k [A] x [B]v.

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Molecular Geometry

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

Mother Nuclide

Nuclide that undergoes nuclear decay.

Line Spectrum

An atomic emission or absorption spectrum.

Heat of Crystallization

The amount of heat that must be removed from one gram of a liquid at its freezing point to freeze it with no change in temperature.

Dimer

Molecule formed by combination of two smaller (identical) molecules.

Atomic Weight

Weighted average of the masses of the constituent isotopes of an element, The relative masses of atoms of different elements.

Barometer

A device for measuring pressure.

Exothermicity

The release of heat by a system as a process occurs.

Sublimation

The direct vaporization of a sold by heating without passing through the liquid state.

Molecular Orbital

An orbit resulting from overlap and mixing of atomic orbitals on different atoms. An MO belongs to the molecule as a whole.