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A catalyst that exists in the same phase (solid, liquid or gas) as the reactants. The process is called Homogeneous Catalysis.

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Band Theory of Metals

Theory that accounts for the bonding and properties of metallic solids.

Lewis Acid

Any species that can accept a share in an electron pair.

Molecule

The smallest particle of an element or compound capable of a stable, independent existence.

Total Ionic Equation

Equation for a chemical reaction written to show the predominant form of all species in aqueous solution or in contact with water.

Chemical Change

A change in which one or more new substances are formed.

yttrium metal

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

Chemical Bonds

The attractive forces that hold atoms together in elements or compounds.

Acidic Salt

A salt containing an ionizable hydrogen atom. Acidic salt does not necessarily produce acidic solutions.

Chemical Equation

Description of a chemical reaction by placing the formulas of the reactants on the left and the formulas of products on the right of an arrow.

Charle's Law

At constant pressure the volume occupied by a definite mass of gas is directly proportional to its absolute temperature.