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A substance that does not conduct electricity at low temperatures but does so at higher temperatures.

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Heisenberg Uncertainty Principle

It is impossible to determine accurately both the momentum and position of an electron simultaneously.

Melting Point

The temperature at which liquid and solid coexist in equilibrium, also the freezing point.

D-Orbitals

Beginning in the third energy level, aset of five degenerate orbitals per energy level, higher in energy than s and p orbitals of the same energy level.

 

Manometer

A two-armed barometer.

Band of Stability

Band containing nonradioactive nuclides in a plot of number of neutrons versus atomic number.

Electromotive Series

The relative order of tendencies for elements and their simple ions to act as oxidizing or reducing agents, also called the activity series.

Emulsifying Agent

A sustance that coats the particles of the dispersed phase and prevents coagulation of colloidal particles, an emulsifier.

Nitrogenases

A class of enzymes found in bacteria within root nodules in some plants, which catalyze reactions by which N2 molecules from the air are converted to ammonia.

 

Derivative

A compound that can be imagined to arise from a partent compound by replacement of one atom with another atom or group of atoms. Used extensively in orgainic chemistry to assist in identifying compounds.

Cathode

Electrode at which reduction occurs in a cathode ray tube, the negative electrode.