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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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Double Bond

Covalent bond resulting from the sharing of four electrons (two pairs) between two atoms.

Charle's Law

At constant pressure the volume occupied by a definite mass of gas is directly proportional to its absolute temperature.

Molecule

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

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

Reaction Stoichiometry

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

Lewis Acid

Any species that can accept a share in an electron pair.

Hydrogen Bond

A fairly strong dipole-dipole interaction (but still considerably weaker than the covalent or ionic bonds) between molecules containing hydrogen directly bonded to a small, highly electronegative atom, such as N, O, or F.

Rate of Reaction

Change in the concentration of a reactant or product per unit time.

Polar Bond

Covalent bond in which there is an unsymmetrical distribution of electron density.

Polarimeter

A device used to measure optical activity.