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A gas or mixture of gases having, in a container an absolute pressure exceeding 40 psi at 21.1°C (70°F)


A gass or mixture having in a container, an absolute pressure exceeding 104 psi at 54.4°C (130°F) regardless of the pressure at (21.1°C (70°F)
A liquid having a vapour pressure exceeding 40 psi at 37.8°C (70°F) as determined by ASTM D-323-72.

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Derivative

A compound that can be imagined to arise from a partent compound by replacement of one atom with another atom or group of atoms. Used extensively in orgainic chemistry to assist in identifying compounds.

Molecular Equation

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

Bomb Calorimeter

A device used to measure the heat transfer between system and surroundings at constant volume.

Law of Definite Proportions (Law of Constant Composition)

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.

Polymorphous

Refers to substances that crystallize in more than one crystalline arrangement.

Cathode Ray Tube

Closed glass tube containing a gas under low pressure, with electrodes near the ends and a luminescent screen at the end near the positive electrode, produces cathode rays when high voltage is applied.

Electrical Conductivity

Ability to conduct electricity.

Nitric Acid

HNO3: A strong acid, it is toxic and can cause severe burns. Transparent colorless or yellowish, fuming, suffocating, caustic and corrosive liquid. Nitric acid boiling point is 83C. A 70 percent solution is used in the S.S.E. laboratory for junction depth measurements. Nitric acid is also present in the metal etch solution used for the Aluminum etch procedure.

Eluant or eluent

The solvent used in the process of elution, as in liquid chromatography.

 

Antibonding Orbital

A molecular orbital higher in energy than any of the atomic orbitals from which it is derived, lends instability to a molecule or ion when populated with electrons, denoted with a star (*) superscript or symbol.

Domain

A cluster of atoms in a ferromagnetic substance, all of which align in the same direction in the presence of an external magnetic field.

Polymerization

The combination of many small molecules to form large molecules.

Density

Density is the ratio b/w Mass and Volume: D=M/V

ytterbia

Ytterbia is a colorless compound, Yb2O3, used in certain alloys and ceramics. Also known as ytterbium oxide.

Carbonium ion

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

Mass Deficiency

The amount of matter that would be converted into energy if an atom were formed from constituent particles.

Meniscus

The shape assumed by the surface of a liquid in a cylindrical container.

Displacement Reactions

Reactions in which one element displaces another from a compound.

 

Heat of Solution

The amount of heat absorbed in the formation of solution that contains one mole of solute, the value is positive if heat is absorbed (endothermic) and negative if heat is released (exothermic).

DP number

The degree of polymerization, the average number of monomer units per polymer unit.