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The total pressure exerted by a mixture of gases is the sum of the partial pressures of the individual gases.

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Ester

A Compound of the general formula R-C-O-R1 where R and R1 may be the same or different, and may be either aliphatic or aromatic.

Adsorption

Adhesion of a species onto the surfaces of particles.

Nickel-cadmium cell (Nicad battery)

A dry cell in which the anode is Cd, the cathode is NiO2, and the electrolyte is basic.

Leclanche Cell

A common type of dry cell.

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)

Gamma Ray

High energy electromagnetic radiation. A highly penetrating type of nuclear radiation similar to x-ray radiation, except that it comes from within the nucleus of an atom and has a higher energy. Energywise, very similar to cosmic ray except that cosmic rays originate from outer space.

S Orbital

A spherically symmetrical atomic orbital, one per energy level.

Electrochemistry

Study of chemical changes produced by electrical current and the production of electricity by chemical reactions.

Ionic Bonding

Chemical bonding resulting from the transfer of one or more electrons from one atom or a group of atoms to another.

Condensed States

The solid and liquid states.

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.

 

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.

Nucleons

Particles comprising the nucleus, protons and neutrons.

Actinides

Elements 89 to 103 (between lawrencium and actinium) on the periodic table. Only the first four have been found in nature in appreciable amounts. The remainder have been produced synthetically.

DP number

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

Faraday

One faraday of electricity corresponds to the charge on 6.022 x 1023 electrons, or 96,487.301 coulombs.

Molarity

Number of moles of solute per litre of solution.

Ideal Gas

A hypothetical gas that obeys exactly all postulates of the kinetic-molecular theory.

 

Amorphous Solid

A noncrystalline solid with no well-defined ordered structure.

Positron

A Nuclear particle with the mass of an electron but opposite charge.