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Any of six isomeric compounds that have the formula C8H11N, are derivatives of xylene, and resemble aniline: used in dye manufacture.

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Denaturation

A process pertaining to a change in structure of a protein form regular to irregular arrangement of the polypeptide chains.

Background Radiation

Ratiation extraneous to an experiment. Usually the low-level natural radiation form cosmic rays and trace radioactive substances present in our environment.

Pairing

A favourable interaction of two electrons with opposite m , values in the same orbital.

Solubility Product Principle

The solubility product constant expression for a slightly soluble compound is the product of the concentrations of the constituent ions, each raised to the power that corresponds to the number of ions in one formula unit.

Enzyme

A protein that acts as a catalyst in biological systems.

Ternary Compound

A compound consisting of three elements, may be ionic or covalent.

Hund's Rule

All orbitals of a given sublevel must be occupied by single electrons before pairing begins.

Pineapple literally "erodes" the tongue

Everyone who has ever tried fresh pineapple knows that if you eat too much, your lips and tongue hurt for a while. This is because the pineapple contains an enzyme called bromelain. This enzyme literally "erodes" the tongue.

Law of Conservation of Matter and Energy

The total amount of matter and energy available in the universe is fixed.

Cis-Trans Isomerism

A type of geometrical isomerism related to the angles between like ligands.