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Refers to ligands with more than one donor atom.

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Ioniztion

The breaking up of a compound into separate ions.

Alkali Metals

Metals of Group IA (Na, K, Rb).

Semiconductor

A substance that does not conduct electricity at low temperatures but does so at higher temperatures.

Secondary Voltaic Cells

Voltaic cells that can be recharged, original reactanats can be regenerated be reversing the direction of the current flow.

Displacement Reactions

Reactions in which one element displaces another from a compound.

 

Downs Cell

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

Period

The elements in a horizontal row of the periodic table.

Semipermable Membrane

A thin partition between two solutions through which certain molecules can pass but others cannot.

Secondary Standard

A solution that has been titrated against a primary standard. A standard solution is a secondary standard.

 

Base

A substance that produces OH (aq) ions in aqueous solution. Strong soluable bases are soluble in water and are completely dissociated. Weak bases ionize only slightly.