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An equation of state that extends the ideal gas law to real gases by inclusion of two empirically determined parameters, which are different for different gases.

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Ternary Acid

A ternary compound containing H, O, and another element, often a nonmetal.

Mole Fraction

The number of moles of a component of a mixture divided by the total number of moles in the mixture.

 

Biodegradability

The ability of a substance to be broken down into simpler substances by bacteria.

 

Nitrogen Cycle

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

 

Hard Water

Water containing Fe3+, Ca2+, and Mg2+ ions, which forms precipates with soap.

Homonuclear

Consisting of only one element.

Downs Cell

Electrolytic cell for the commercial electrolysis of molten sodium chloride. For further information see Electrochemistry or Fuel Cells.

End Point

The point at which an indicator changes colour and a titration is stopped.

Native State

Refers to the occurrence of an element in an uncombined or free state in nature.

 

Amphiprotism

Ability of a substance to exhibit amphiprotism by accepting donated protons.