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Representation of the core of a molecule, ion or formula unit by showing atomic symbols and only outer shell electrons.

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Fluids

Substances that flow freely, gases and liquids.

Excited State

Any state other than the ground state of an atom or molecule.

Oxidation Numbers

Arbitrary numbers that can be used as mechanical aids in writing formulas and balancing equations, for single- atom ions they correspond to the charge on the ion, more electronegative atoms are assigned negative oxidation numbers (also called Oxidation states).

Dermal toxicity

Adverse health effects resulting from skin exposure ot a substance.

Barometer

A device for measuring pressure.

Chemical Change

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

Aldehyde

Compound in which an alkyl or aryl group and a hydrogen atom are attached to a carbonyl group and a hydrogen atom are attached to a carbonyl group, general formula, O-R-C-H

 

xenon trioxide

A colorless, nonvolatile solid, XeO3, explosive when dry: in solution it is called xenic acid.

Solubility Product Constant

Equilibrium constant that applies to the dissolution of a slightly soluble compound.

Electrodes

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