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The Chemical Glossary currently has 651 chemical entries. You may search the Chemical Glossary by entering the keyword in the search box or by browsing the entire chemical glossary by letter in alphabetical order.

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Activity of a component of ideal mixture

A dimensionless quantity whose magnitude is: equal to molar concentration in an ideal solution, equal to partial pressure in an ideal gas mixture, and defined as 1 for pure solids or liquids.

Radical

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

Electromotive Series

The relative order of tendencies for elements and their simple ions to act as oxidizing or reducing agents, also called the activity series.

Heterogeneous Equilibria

Equilibria involving species in more than one phase.

Hydration

Reaction of a substance with water.

Coordination Number

In describing crystals, the number of nearest neighbours of an atom or ion. The number of donor atoms coordinated to a metal.

Varieties of garnet minerals

The most famous type of garnet stone is pyrope (flaming). This is the "oldest of garnets", with a dense red color, similar to the grain of an edible garnet. Pyrope has a variety called rhodolite - a stone of dense pink or pink-purple color, which sometimes has the alexandrite effect and is used in elite jewelry.

Equivalence Point

The point at which chemically equivalent amounts of reactants have reacted.

Extensive Property

A property that depends upon the amount of material in a sample.

Standard Molar Volume

The volume occupied by one mole of an ideal gas under standard conditions, 22.4liters.