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Compound produced by dehydration of a carbonic acid. General formula is R--C--O--C--R. Chemical compound that reacts with water to form an acid and are usually oxides of nonmetallic elements.

Anhydrides are generally more reactive than their corresponding acids because they are able to react with water to form their corresponding acid.

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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).

Secondary Voltaic Cells

Voltaic cells that can be recharged, original reactanats can be regenerated be reversing the direction of the current flow.

Kinetic Energy

Energy that matter processes by virtue of its motion.

Enantiomer

One of the two mirror-image forms of an optically active molecule.

Molar Solubility

Number of moles of a solute that dissolve to produce a litre of saturated solution.

Safranine

Also called "phenosafranine". A purplish-red, water-soluble dye, C18H14N4, used for textiles and as a stain in microscopy.

Period

The elements in a horizontal row of the periodic table.

Zone Refining

A method of purifying a bar of metal by passing it through an induction heater, this causes impurties to move along a melted portion. This method applies the fact when a metal crystallizes on cooling, impurities are automatically expelled as they do not form part of the crystal.

Compound

A substance of two or more elements in fixed proportions. Compounds can be decomposed into their constituent elements.

Electrophile

Positively charged or electron-deficient.