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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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Nonbonding Orbital

A molecular orbital derived only from an atomic orbital of one atom, lends neither stability nor instability to a molecule or ion when populated with electrons.

Alkali Metals

Metals of Group IA (Na, K, Rb).

Molar Solubility

Number of moles of a solute that dissolve to produce a litre of saturated solution.

Standard Entropy

The absolute entropy of a substance in its standard state at 298 K.

Evaporation Rate

The rate at which a particular substance will vapourize (evaporate) when compared to the rate of a known substance such as ethyl ether. This term is especially useful for health and fire-hazard considerations.

Aromatic Hydrocarbons

Benzene and its derivatives.

Secondary Voltaic Cells

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

Emulsion

Colloidal suspension of a liquid in a liquid.

Heat of Fusion

The amount of heat required to melt one gram of solid at its melting point with no change in temperature. Usually expressed in J/g. The molar heat of fusion is the amount of heat required to melt one mole of a solid at its melting point with no change in temperature and is usually expressed in kJ/mol.

Plasma

A physical state of matter which exists at extremely high temperatures in which all molecules are dissociated and most atoms are ionized.