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Any of a subgroup of rare-earth elements, of which the cerium and terbium metals comprise the other two subgroups.

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Conduction Band

A partially filled band or a band of vacant energy levels just higher in energy than a filled band, a band within which, or into which, electrons must be promoted to allow electrical conduction to occur in a solid.

Why do copper products change color, and what is the name of the process?

Probably, every person wants to know, why over time the copper turns green and becomes bloomed. This is easy to explain: that film is called patina.

Critical Pressure

The pressure required to liquefy a gas (vapor) at its critical temperature.

Inhibitory Catalyst

An inhibitor, a catalyst that decreases the rate of reaction.

End Point

The point at which an indicator changes colour and a titration is stopped.

Matter

Anything that has mass and occupies space.

Deposition

The direct solidification of a vapor by cooling, the reverse of sublimation.

Saturated Hydrocarbons

Hydrocarbons that contain only single bonds. They are also called alkanes or paraffin hydrocarbons.

Eluate

Solvent (or mobile phase) which passes through a chromatographic column and removes the sample components from the stationary phase.

Faraday

One faraday of electricity corresponds to the charge on 6.022 x 1023 electrons, or 96,487.301 coulombs.