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The law stating that a pure substance will always have the same percent by weight. Different samples of a pure compound always contain the same elements in the same proportions by mass.

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All Chemicals - Chemical Glossary

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.

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.

Functional Group

A group of atoms that represents a potential reaction site in an organic compound.

Leclanche Cell

A common type of dry cell.

Basic Anhydride

The oxide of a metal that reacts with water to form a base.

Absorption Spectrum

Spectrum associated with absorption of electromagnetic radiation by atoms (or other species) resulting from transitions from lower to higher energy states. An absorption spectrum is the inverse of an emission spectrum.

Voltage

Potential difference between two electrodes, a measure of the chemical potential for a redox reaction to occur.

Extensive Property

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

Periodicity

Regular periodic variations of properties of elements with atomic number (and position in the periodic table).

Avogadro's Number

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