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The amount of heat that must be removed from one gram of a liquid at its freezing point to freeze it with no change in temperature.

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Barometer

A device for measuring pressure.

Percent Purity

The percent of a specified compound or element in an impure sample.

Hydrophilic Colloids

Colloidal particles that repel water molecules.

Magnetic Quantum Number (mc)

Quantum mechanical solution to a wave equation that designates the particular orbital within a given set (s, p, d, f ) in which a electron resides.

Faraday

One faraday of electricity corresponds to the charge on 6.022 x 1023 electrons, or 96,487.301 coulombs.

Eluant or eluent

The solvent used in the process of elution, as in liquid chromatography.

 

Absolute Zero

The zero point on the absolute temperature scale, -273.15°C or 0 K, theoretically, the temperature at which molecular motion ceases. The concept of an absolute zero temperature was first deduced from experiments with gases. When a fixed volume of gas is cooled, its pressure decreases with its temperature. Absolute zero physically possesses quantum mechanical zero-point energy.

Denaturation

A process pertaining to a change in structure of a protein form regular to irregular arrangement of the polypeptide chains.

Fluorescence

Absorption of high energy radiation by a substance and subsequent emission of visible light.

Secondary Voltaic Cells

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