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Water containing deuterium, a heavy isotope of hydrogen.

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Ligand

A Lewis base in a coordination compound.

Common Ion Effect

Suppression of ionization of a weak electrolyte by the presence in the same solution of a strong electrolyte containing one of the same ions as the weak electrolyte.

Aldehyde

Compound in which an alkyl or aryl group and a hydrogen atom are attached to a carbonyl group and a hydrogen atom are attached to a carbonyl group, general formula, O-R-C-H

 

Integrated Rate Equation

An equation giving the concentration of a reactant remaining after a specified time, has different mathematical form for different orders of reactants.

Bond Order

Half the numbers of electrons in bonding orbitals minus half the number of electrons in antibonding orbitals. Bond order gives an indication to the stability of a bond. Also defined as the difference between the number of bonding electrons and antibonding electrons divided by two.

Substance

Any kind of matter all specimens of which have the same chemical composition and physical properties.

 

Mother Nuclide

Nuclide that undergoes nuclear decay.

Element

A substance that cannot be decomposed into simpler substances by chemical means.

Excited State

Any state other than the ground state of an atom or molecule.

Binary Acid

A binary compound in which H is bonded to one or more of the more electronegative nonmetals.

Matter

Anything that has mass and occupies space.

Radioactive Dating

Method of dating ancient objects by determining the ratio of amounts of mother and daughter nuclides present in an object and relating the ratio to the object?s age via half-life calculations.

Reverse Osmosis

Forcing solvent molecules to flow through a semipermable membrane from a concentated solution into a dilute solution by the application of greater hydrostatic pressure on concentrated side than the osmotic pressure opposing it.

Sigma Orbital

Molecular orbital resulting from head-on overlap of two atomic orbitals.

Disproportionation Reactions

Redox reactions in which the oxidizing agent and the reducing agent are the same species.

Peroxide

A compound containing oxygen in the -1 oxidation state. Metal peroxides contain the peroxide ion, O22

Electrical Conductivity

Ability to conduct electricity.

Spectral Line

Any of a number of lines corresponding to definite wavelengths of an atomic emission or absorption spectrum, represents the energy difference between two energy levels.

 

Formula

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

 

Insulator

Poor electric and heat conductor.