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A catalyst that exists in a different phase (solid, liquid or gas) from the reactants, a contact catalyst.

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Coordination Compound or Complex

A compound containing coordinate covalent bonds.

Clay

A class of silicate and aluminosilicate minerals with sheet-like structures that have enormous surface areas that can absorb large amounts of water.

Periodic Table

An arrangement of elements in order of increasing atomic numbers that also emphasizes periodicity.

Hydrocarbons

Compounds that contain only carbon and hydrogen.

Carbonium ion

An orgainic ion carrying a positive charge on a carbon atom.

Dosimeter

A small, calibrated electroscope worn by laboratory personnel and designated to detect and measure incident ionizing radiation or chemical exposure.

Silicones

Polymeric organosilicon compounds, contain individual or cross-linked Si-O chains or rings in which some oxygens of SiO4 tetrahedra are replaced by other groups.

Barometer

A device for measuring pressure.

Henry's Law

The pressure of the gas above a solution is proportional to the concentration of the gas in the solution.

Ester

A Compound of the general formula R-C-O-R1 where R and R1 may be the same or different, and may be either aliphatic or aromatic.