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Covalent bond in which electron density is symmetrically distributed.

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Levorotatory

Refers to an optically active substance that rotates the plane of plane polarized light counterclockwise, also called levo.

Hydrogenation

The reaction in which hydrogen adds across a double or triple bond.

Deposition

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

Metallic Conduction

Conduction of electrical current through a metal or along a metallic surface.

Electrolytic Conduction

Conduction of electrical current by ions through a solution or pure liquid.

Solvent

The dispersing medium of a solution.

Molality

Concentration expressed as number of moles of solute per kilogram of solvent.

Cathode Ray Tube

Closed glass tube containing a gas under low pressure, with electrodes near the ends and a luminescent screen at the end near the positive electrode, produces cathode rays when high voltage is applied.

Cathodic Protection

Protection of a metal (making ir a cathode) against corrosion by attaching it to a sacrifical anode of a more easily oxidized metal.

Substance

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