HOME | SITE MAP

  Site: Index >> Information >> Chemical Dictionary

Sourcing by alphabetical listing:
Chemistry Dictionary Terminology "A"
Chemistry Dictionary Terminology  "P"

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.
Paramagnetism
Attraction toward a magnetic field, stronger than diamagnetism, but still weak compared to ferromagnetism.
Partial Pressure
The pressure exerted by one gas in a mixture of gases.
Particulate Matter
Fine divided solid particles suspended in polluted air.
Pauli Exclusion Principle
No two electrons in the same atom may have identical sets of four quantum numbers.
Percentage Ionization
The percentage of the weak electrolyte that ionizes in a solution of given concentration.
Percent by Mass
100% times the actual yield divided by theoretical yield.
Percent Composition
The mass percent of each element in a compound.
Percent Purity
The percent of a specified compound or element in an impure sample.
Period
The elements in a horizontal row of the periodic table.
Periodicity
Regular periodic variations of properties of elements with atomic number (and position in the periodic table).
Periodic Law
The properties of the elements are periodic functions of their atomic numbers.
Periodic Table
An arrangement of elements in order of increasing atomic numbers that also emphasizes periodicity.
Peroxide
A compound containing oxygen in the -1 oxidation state. Metal peroxides contain the peroxide ion, O22-
pH
Negative logarithm of the concentration (mol/L) of the H3O+[H+] ion; scale is commonly used over a range 0 to 14.
Phase Diagram
Diagram that shows equilibrium temperature-pressure relationships for different phases of a substance.
Phenol
Hydrocarbon derivative containing an [OH] group bound to an aromatic raing.
Photochemical Oxidants
Photochemically produced oxidizing agents capable of causing damage to plants and animals.
Photochemical Smog
A brownish smog occurring in urban areas receiving large amounts of sunlight; caused by photochemical (light-induced) reactions among nitrogen oxides, hydrocarbons and other components of polluted air that produce photochemical oxidants.
Photoelectric Effect
Emission of an electron from the surface of a metal caused by impinging electromagnetic radiation of certain minimum energy; current increases with increasing intensity of radiation.
Photon
A packet of light or electromagnetic radiation; also called quantum of light
Physical Change
A change in which a substance changes from one physical state to another but no substances with different composition are formed. Example Gas to Liquid - Solid.
Plasma
A physical state of matter which exists at extremely high temperatures in which all molecules are dissociated and most atoms are ionized.
Polar Bond
Covalent bond in which there is an unsymmetrical distribution of electron density.
Polarimeter
A device used to measure optical activity.
Polarization
The buildup of a product of oxidation or a reduction of an electrode, preventing further reaction.
Polydentate
Refers to ligands with more than one donor atom.
Polyene
A compound that contains more than one double bond per molecule.
Polymerization
The combination of many small molecules to form large molecules.
Polymer
A large molecule consisting of chains or rings of linked monomer units, usually characterized by high melting and boiling points.
Polymorphous
Refers to substances that crystallize in more than one crystalline arrangement.
Polyprotic Acid
An Acid that can form two or more hydronium ions per molecule; often a least one step of ionization is weak.
Positron
A Nuclear particle with the mass of an electron but opposite charge.
Potential Energy
Energy that matter possesses by virtue of its position, condition or composition.
Precipitate
An insoluble solid formed by mixing in solution the constituent ions of a slightly soluble solution.
Primary Standard
A substance of a known high degree of purity that undergoes one invariable reaction with the other reactant of interest.
Primary Voltaic Cells
Voltaic cells that cannot be recharged; no further chemical reaction is possible once the reactants are consumed.
Proton
A subatomic particle having a mass of 1.0073 amu and a charge of +1, found in thew nuclei of atoms.
PseudobinaryIonic Compounds
Compounds that contain more than two elements but are named like binary compounds.


Chemical:    
(Powered by Chemindustry.com)

Enter a chemical name, CAS Number, or molecular formula. Use * for partial names (i.e. chloro*)
Welcome to the Hichem.com Chemical Name Synonyms finder.

Enter any of the following options in the search box:

  • a complete chemical name   e.g. Chlorosulfuric acid.
  • a partial name   e.g. 1 chloro*, e.g. 2 *chloride.
  • a CAS number   e.g. 50-00-0.
  • a molecular formula   e.g. C6H6.
Popular Chemicals
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
 

General Chemistry Glossary

Browse alphabetically: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

 
Home | About Us | Contact Us | Disclaimer | Site map
Copyright all reserved by Teloon Chem Corporation 2003-2014