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

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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.

Alpha Particles

A helium nucleus.

Electrodes

Surfaces upon which oxidation and reduction half-reactions, occur in electrochemical cells.

Equation of State

An equation that describes the behavior of matter in a given state, the van der Waals equation describes the behavior of the gaseous state.

Mass

A measure of the amount of matter in an object. Mass is usually measured in grams or kilograms.

Lewis Base

Any species that can make available a share in an electron pair.

Acid Anhydride

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.

Ioniztion

The breaking up of a compound into separate ions.

Nitrogen Cycle

The complex series of reactions by which nitrogen is slowly but continually recycled in the atmosphere, lithosphere and hydrosphere.

 

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.