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A measure of the amount of matter in an object. Mass is usually measured in grams or kilograms.

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Distillate

The material in a distillation apparatus that is collected in the receiver.

 

Standard Molar Enthalphy of Formation

The amount of heat absorbed in the formation of one mole of a substance in a specified state from its elements in their standard states.

Fractional Distillation

The process in which a fractioning column is used in distillation apparatus to separate components of a liquid mixture that have different boiling points.

Ternary Compound

A compound consisting of three elements, may be ionic or covalent.

Nitrogen Cycle

The complex series of reactions by which nitrogen is slowly but continually recycled in the atmosphere, lithosphere and hydrosphere.

 

Formula Unit

The smallest repeating unit of a substance. The molecule for nonionic substances

Solubility Product Constant

Equilibrium constant that applies to the dissolution of a slightly soluble compound.

Heat of Vaporization

The amount of heat required to vaporize one gram of a liquid at its boiling point with no change in temperature. Usually expressed in J/g. The molar heat of vaporization is the amount of heat required to vaporize one mole of liquid at its boiling point with no change in temperature and usually expressed ion kJ/mol.

Heavy Water

Water containing deuterium, a heavy isotope of hydrogen.

Radical

An atom or group of atoms that contains one or more unpaired electrons (usually very reactive species)