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The temperature at which liquid and solid coexist in equilibrium, also the freezing point.

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Eutrophication

The undesirable overgrowth of vegetation caused by high concentrates of plant nutrients in bodies of water.

Donor Atom

A ligand atom whose electrons are shared with a Lewis acid.

Electron

A subatomic particle having a mass of 0.00054858 amu and a charge of 1-.

Leclanche Cell

A common type of dry cell.

Mass

A measure of the amount of matter in an object. Mass is usually measured in grams or kilograms.

Ground State

The lowest energy state or most stable state of an atom, molecule or ion.

Polymer

A large molecule consisting of chains or rings of linked monomer units, usually characterized by high melting and boiling points.

Homologous Series

A series of compounds in which each member differs from the next by a specific number and kind of atoms.

Colloid

A heterogeneous mixture in which solute-like particles do not settle out.

Effective Collisons

Collision between molecules resulting in a reaction, one in which the molecules collide with proper relative orientations and sufficient energy to react.