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A substance that cannot be decomposed into simpler substances by chemical means.

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Condensation

Liquefaction of vapor.

Ideal Gas Law

The product of pressure and the volume of an ideal gas is directly proportional to the number of moles of the gas and the absolute temperature.

Dextrorotatory

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

Hydration Energy

The energy change accompanying the hydration of a mole of gase and ions.

Theoretical Yield

Maximum amount of a specified product that could be obtained from specified amounts of reactants, assuming complete consumption of limiting reactant according to only one reaction and complete recovery of product.

Endothermic

Describes processes that absorb heat energy.

Alkali Metals

Metals of Group IA (Na, K, Rb).

Composition Stoichiometry

Descibes the quantitative (mass) relationships among elements in compounds.

Haber Process

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

Excited State

Any state other than the ground state of an atom or molecule.