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A sustance that coats the particles of the dispersed phase and prevents coagulation of colloidal particles, an emulsifier.

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Critical Point

The combination of critical temperature and critical pressure of a substance.

Emission Spectrum

Spectrum associated with emission of electromagnetic radiation by atoms (or other species) resulting from electronic transitions from higher to lower energy states.

 

Electronic Geometry

The geometric arrangement of orbitals containing the shared and unshared electron pairs surrounding the central atom of a molecule or polyatomic ion.

Percent by Mass

100% times the actual yield divided by theoretical yield.

Chemical Equilibrium

A state of dynamic balance in which the rates of forward and reverse reactions are equal, there is no net change in concentrations of reactants or products while a system is at equilibrium.

xenon tetrafluoride

A colorless, crystalline compound, XeF4, prepared by heating a gaseous mixture of fluorine and xenon.

Deuterium

An isotope of hydrogen whose atoms are twice as massive as ordinary hydrogen,deuterion atoms contain both a proton and a neutron in the nucleus.

Catalyst

A substance that speeds up a chemical reaction without being consumed itself in the reaction.
A substance that alters (usually increases) the rate at which a reaction occurs.

Isomers

Different substances that have the same formula.

Electrolytic Conduction

Conduction of electrical current by ions through a solution or pure liquid.

Amine

Derivatives of ammonia in which one or more hydrogen atoms have been replaced by organic groups.

Nuclides

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

Saccharic

of or derived from saccharin or a saccharine substance.

 

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.

Conjugated Double Bonds

Double bonds that are separated from each other by one single bond -C=C-C=C-.

Aufbau ('building up') Principle

Describes the order in which electrons fill orbitals in atoms.

Eluant or eluent

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

 

Coefficient of expansion

The ratio of the change in length or volumen of a body to the original lengthor volume for a unit change in temperature.

Chain Termination Step

The combination of two radicals, which removes the reactive species that propagate the change reaction.

Surface Tension

It is the force in dynes acting along the surface of the liquid 1cm in length and perpendicular to it.