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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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Free Energy Change

The indicator of spontaneity of a process at constnt T and P. If delta-G is negative, the process is spontaneous.

Le Chatelier's Principle

States that a system at equilibrium, or striving to attain equilibrium, responds in such a way as to counteract any stress placed upon it.
If a stress (change of conditions) is applied to a system at equilibrium, the system shifts in the direction that reduces stress.

Element

A substance that cannot be decomposed into simpler substances by chemical means.

Atomic Number


Integral number of protons in the nucleus, defines the identity of element.
 

Ideal Solution

A solution that obeys Raoult's Law exactly.

Isomers

Different substances that have the same formula.

Oil

Liquid triester of glycerol and unsaturated fatty acids.

Limiting Reactant

Substance that stoichiometrically limits the amount of product(s) that can be formed.

Atmosphere

A unit of pressure, the pressure that will support a column of mercury 760 mm high at 0 °C.

Law of Conservation of Energy

Energy cannot be created or destroyed, it may be changed from one form to another.