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Voltaic cells that can be recharged, original reactanats can be regenerated be reversing the direction of the current flow.

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Anode

In a cathode ray tube, the positive electrode. Electrode at which oxidation occurs.

Enzyme

A protein that acts as a catalyst in biological systems.

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Saturated Hydrocarbons

Hydrocarbons that contain only single bonds. They are also called alkanes or paraffin hydrocarbons.

Activity of a component of ideal mixture

A dimensionless quantity whose magnitude is: equal to molar concentration in an ideal solution, equal to partial pressure in an ideal gas mixture, and defined as 1 for pure solids or liquids.

Law of Definite Proportions (Law of Constant Composition)

The law stating that a pure substance will always have the same percent by weight. Different samples of a pure compound always contain the same elements in the same proportions by mass.

Insulator

Poor electric and heat conductor.

Molecule

The smallest particle of an element or compound capable of a stable, independent existence.

Deposition

The direct solidification of a vapor by cooling, the reverse of sublimation.

Polyprotic Acid

An Acid that can form two or more hydronium ions per molecule, often a least one step of ionization is weak.