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Equation for a chemical reaction in which all formulas are written as if all substances existed as molecules, only complete formulas are used.

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Open Sextet

Refers to species that have only six electrons in the highest energy level of the central element (many Lewis acids).

Natural Radioactivity

Spontaneous decomposition of an atom.

Nuclides

Refers to different atomic forms of all elements in contrast to ?isotopes?, which refer only to different atomic forms of a single element.

Molarity

Number of moles of solute per litre of solution.

Metalloids

Elements with properties intermediate between metals and nonmetals: B, Al, Si, Ge, As, Sb, Te, Po, and At.

Effective Molality

The sum of the molalities of all solute particles in a solution.

Binary Acid

A binary compound in which H is bonded to one or more of the more electronegative nonmetals.

Mixture

A sample of matter composed of two or more substances, each of which retains its identity and properties.

Indicators

For acid-base titrations, organic compounds that exhibit different colors in solutions of different acidities, used to determine the point at which reaction between two solutes is complete.

Condensed States

The solid and liquid states.

Designated area

An area that may be used for work with carcinogens, reproductive toxins, or substances that have a high degree of acute toxicity. A designated area may be the entire laboratory, an area of a laboratory, or a device such as a laboratory hood.

Periodic Table

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

Sigma Bonds

Bonds resulting from the head-on overlap of atomic orbitals, in which the region of electron sharing is along and (cylindrically) symmetrical to the imaginary line connecting the bonded atoms.

Extrapolate

To estimate the value of a result outside the range of a series of known values. Technique used in standard additions calibration procedure.

Eluate

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

D-Orbitals

Beginning in the third energy level, aset of five degenerate orbitals per energy level, higher in energy than s and p orbitals of the same energy level.

 

Chemical Hygiene Officer (CHO)

A person or employee who is qualified by training or experience to provide technical guidance in the development and implementations of the provisions of a Chemical Hygiene Plan (CHP)

Hydrocarbons

Compounds that contain only carbon and hydrogen.

xylene

Any of three oily, colorless, water-insoluble, flammable, toxic, isomeric liquids, C8H10, of the benzene series, obtained mostly from coal tar: used chiefly in the manufacture of dyes.

Double Salt

Solid consisting of two co-crystallized salts.