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Group of atoms remaining after a hydrogen atom is removed from the aromatic system.

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Fuel Cells

Voltaic cells in which the reactants (usually gases) are supplied continuously.
A voltaic cell that converts the chemical energy of a fuel and an oxidizing agent directly into electriacl energy on a continuous basis.

Mechanism

The sequence of steps by which reactants are converted into products.

Hund's Rule

All orbitals of a given sublevel must be occupied by single electrons before pairing begins.

Photoelectric Effect

Emission of an electron from the surface of a metal caused by impinging electromagnetic radiation of certain minimum energy, current increases with increasing intensity of radiation.

 

Ionization Energy

The minimum amount of energy required to remove the most loosely held electron of an isolated gaseous atom or ion.

Kinetic Energy

Energy that matter processes by virtue of its motion.

Hydrolysis

The reaction of a substance with water or its ions.

Antibonding Orbital

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.

Bronsted-Lowry Base

A proton acceptor

Substance

Any kind of matter all specimens of which have the same chemical composition and physical properties.