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The liquid and solid phases, phases in which particles interact strongly.

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Catalyst

A substance that speeds up a chemical reaction without being consumed itself in the reaction.
A substance that alters (usually increases) the rate at which a reaction occurs.

Graham's Law

The rates of effusion of gases are inversely proportional to the square roots of their molecular weights or densities.

Addition Reaction

A reaction in which two atoms or groups of atoms are added to a molecule, one on each side of a double or triple bond. Types of addition reaction include electrophilic, nucleophilic (polar) and free radical addition (non-polar).

Tyndall Effect

The scattering of light by colloidal particles.

Hydride

A binary compound of hydrogen.

 

Coordination Compound or Complex

A compound containing coordinate covalent bonds.

Beta Particle

Electron emitted from the nucleus when a neuton decays to a proton and an electron.

Chemical Change

A change in which one or more new substances are formed.

Saponification

Hydrolysis of esters in the presence of strong soluable bases.

Free Radical

A highly reactive chemical species carrying no charge and having a single unpaired electron in an orbital.