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The mass of one formula unit of a substance in atomic mass units.

 

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Donor Atom

A ligand atom whose electrons are shared with a Lewis acid.

Combustible

Classification of liquid substances that will burn on the basis of flash points. A combustible liquid means any liquid having a flash point at or above 37.8°C (100°F) but below 93.3°C (200°F), except any mixture having components with flash points of 93.3°C (200°F) or higher, the total of which makes up 99 percent or more of the total volume of the mixture.

Total Ionic Equation

Equation for a chemical reaction written to show the predominant form of all species in aqueous solution or in contact with water.

Lanthanides

Elements 58 to 71 (after lanthanum).

Tyndall Effect

The scattering of light by colloidal particles.

Octane Number

A number that indicates how smoothly a gasoline burns.

Avogadro's Number

The number (6.022x10^23) of atoms, molecules or particles found in exactly 1 mole of substance.

Quantum Mechanics

Mathematical method of treating particles on the basis of quantum theory, which assumes that energy (of small particles) is not infinitely divisible.

Acid

A substance that produces H+(aq) ions in aqueous solution. Strong acids ionize completely or almost completely in dilute aqueous solution. Weak acids ionize only slightly. Chemicals or substances having the property of an acid are said to be acidic.

Precipitate

An insoluble solid formed by mixing in solution the constituent ions of a slightly soluble solution.