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Water containing Fe3+, Ca2+, and Mg2+ ions, which forms precipates with soap.

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Dissociation

In aqueous solution, the process in which a solid ionic compound separates into its ions.

Compound

A substance of two or more elements in fixed proportions. Compounds can be decomposed into their constituent elements.

Enthalpy

The heat content of a specific amount of substance, defined as E= PV.

Composition Stoichiometry

Descibes the quantitative (mass) relationships among elements in compounds.

Oxide

A binary compound of oxygen.

Percent Composition

The mass percent of each element in a compound.

Radical

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

Matter

Anything that has mass and occupies space.

Contact Process

Industrial process by which sulfur trioxide and sulfuric acid are produced from sulfur dioxide.

Pairing Energy

Energy required to pair two electrons in the same orbital.