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A molecular orbital higher in energy than any of the atomic orbitals from which it is derived, lends instability to a molecule or ion when populated with electrons, denoted with a star (*) superscript or symbol.

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Structural Isomers

Compounds that contain the same number of the same kinds of atoms in different geometric arrangements.

Alkaline Battery

A dry cell in which the electrolyte contains KOH.

Specific Rate Constant

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.

Alcohol

Hydrocarbon derivative containing an --OH group attached to a carbon atom not in an aromatic ring. Alcohols are a class of organic compounds containing the hydroxyl group, OH, attached to a carbon atom.

Isomorphous

Refers to crystals having the same atomic arrangement.

Fast Neutron

A neutron ejected at high kinetic energy in a nuclear reaction.

Fossil Fuels

Substances consisting largely of hydrocarbons, derived from decay of organic materials under geological conditions of high pressure and temperature (metamorphism) include coal, petroleum, natural gas, peat and oil shale.  For further information see Fuel Chemistry

Homogeneous Mixture

A mixture which has uniform composition and properties throughout.

Half-Reaction

Either the oxidation part or the reduction part of a redox reaction.

Primary Voltaic Cells

Voltaic cells that cannot be recharged, no further chemical reaction is possible once the reactants are consumed.