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The absolute entropy of a substance in its standard state at 298 K.

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Functional Group

A group of atoms that represents a potential reaction site in an organic compound.

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.

Endothermic

Describes processes that absorb heat energy.

Frequency

The number of repeating corresponding points on a wave that pass a given observation point per unit time.

Nickel-cadmium cell (Nicad battery)

A dry cell in which the anode is Cd, the cathode is NiO2, and the electrolyte is basic.

Lead Storage Battery

Secondary voltaic cell used in most automobiles.

Electrical Conductivity

Ability to conduct electricity.

Reaction Stoichiometry

Description of the quantitative relationships among substances as they participate in chemical reactions.

Bronsted-Lowry Base

A proton acceptor

Collision Theory

Theory of reaction rates that states that effective collisions between reactant molecules must occur in order for the reaction to occur.