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Oxidation of metals in the presence of air and moisture.

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Nitrogen Cycle

The complex series of reactions by which nitrogen is slowly but continually recycled in the atmosphere, lithosphere and hydrosphere.

 

Formula Weight

The mass of one formula unit of a substance in atomic mass units.

 

Chemical Hygiene Plan (CHP)

A written program developed and implemented by an employer designating proceedures, equipment, personal protective equipment, and work practices that are capable of protecting employees from the health hazards presented by hazardous chemicals usid in that particular workplace.

Background Radiation

Ratiation extraneous to an experiment. Usually the low-level natural radiation form cosmic rays and trace radioactive substances present in our environment.

Hess' Law of Heat Summation

The enthalpy change for a reaction is the same whether it occurs in one step or a series of steps.

Open Sextet

Refers to species that have only six electrons in the highest energy level of the central element (many Lewis acids).

Line Spectrum

An atomic emission or absorption spectrum.

Exothermic

Describes processes that release heat energy.

Flash Point

The temperature at which a liquid will yield enough flamable vapour to ignite. There are various recognized industrial testing methods, therefore the method used must be stated.

Oxidation

An algebraic increase in the oxidation number, may correspond to a loss of electrons.