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A gas formed by boiling or evaporating a liquid.

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Amphoterism

The ability to react with both acids and bases.Ability of substance to act as either an acid or a base.

Octet Rule

Many representative elements attain at least a share of eight electrons in their valence shells when they form molecular or ionic compounds, there are some limitations.

Concentration

Amount of solute per unit volume or mass of solvent or of solution.

Lanthanides

Elements 58 to 71 (after lanthanum).

Catenation

Bonding of atoms of the same element into chains or rings.
The bonding together of atoms of the same element to form chains.
The ability of an element to bond to itself.

Atmosphere

A unit of pressure, the pressure that will support a column of mercury 760 mm high at 0 °C.

Insoluble Compound

A very slightly soluble compound.

Bronsted-Lowry Acid

A proton donor.

Chemical Equilibrium

A state of dynamic balance in which the rates of forward and reverse reactions are equal, there is no net change in concentrations of reactants or products while a system is at equilibrium.

Formula

Combination of symbols that indicates the chemical composition of a substance.

 

Dubnium

Discovered : at both Berkeley, California, USA, and Dubna, near Moscow, Russia in 1970. Description:A highly radioactive metal which does not occur naturally, and of which only a few atoms have ever been made. It is of research interest only. Origin:The element is named after the Russian town of Dubna.

Eluate

Solvent (or mobile phase) which passes through a chromatographic column and removes the sample components from the stationary phase.

First Law of Thermodynamics

The total amount of energy in the universe is constant (also known as the Law of Conservation of Energy) energy is neither created nor destroyed in ordinary chemical reactions and physical changes.

Levorotatory

Refers to an optically active substance that rotates the plane of plane polarized light counterclockwise, also called levo.

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.

Boyle's Law

At constant temperature the volume occupied by a definite mass of a gas is inversely proportional to the applied pressure.

Chain Reaction

A reaction that, once initiated, sustains itself and expands. This is a reaction in which reactive species, such as radicals, are produced in more than one step. These reactive species, radicals, propagate the chain reaction.

 

Activity Series

A listing of metals (and hydrogen) in order of decreasing activity.

Reversible Reaction

Reactions that do not go to completion and occur in both the forward and reverse direction.

Dissociation Constant

Equilibrium constant that applies to the dissociation of a comples ion into a simple ion and coordinating species (ligands).