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The law stating that a pure substance will always have the same percent by weight. Different samples of a pure compound always contain the same elements in the same proportions by mass.

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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.

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)

Lewis Base

Any species that can make available a share in an electron pair.

Amino Acid

Compound containing both an amino and a carboxylic acid group.The --NH2 group.

Saturated Hydrocarbons

Hydrocarbons that contain only single bonds. They are also called alkanes or paraffin hydrocarbons.

Biodegradability

The ability of a substance to be broken down into simpler substances by bacteria.

 

Dilution

Process of reducing the concentration of a solute in solution, usually simply by mixing with more solvent.

S Orbital

A spherically symmetrical atomic orbital, one per energy level.

Pairing

A favourable interaction of two electrons with opposite m , values in the same orbital.

Pairing Energy

Energy required to pair two electrons in the same orbital.

Actual Yield

Amount of a specified pure product actually obtained from a given reaction. Compare with Theoretical Yield.

Dextrorotatory

Refers to an optically active substance that rotates the plane of plane polarized light clockwise, also called dextro.

Polyene

A compound that contains more than one double bond per molecule.

Weak Field Ligand

A Ligand that exerts a weak crystal or ligand field and ge- nerally forms high spin complexes with metals.

Periodicity

Regular periodic variations of properties of elements with atomic number (and position in the periodic table).

Oxidizing Agent

The substance that oxidizes another substance and is reduced.

Carcinogen

A substance capable of causing or producing cancer in mammals.

 

Absolute Entropy (of a substance)

The increase in the entropy of a substance as it goes from a perfectly ordered crystalline form at 0 °K (where its entropy is zero) to the temperature in question.

Entropy is a measure of the “dilution” of thermal energy.

Flux

A substance added to react with the charge, or a product of its reduction, in metallurgy, usually added to lower a melting point.

Ether

Compound in which an oxygen atom is bonded to two alkyl or two aryl groups, or one alkyl and one aryl group.