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A heterogeneous mixture in which solute-like particles settle out of solvent-like phase some time after their introduction.

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Limiting Reactant

Substance that stoichiometrically limits the amount of product(s) that can be formed.

Valence Electrons

Outermost electrons of atoms, usually those involved in bonding.

Endothermic

Describes processes that absorb heat energy.

Vapor Pressure

The particle pressure of a vapor at the surface of its parent liquid.

Particulate Matter

Fine divided solid particles suspended in polluted air.

Saturated Hydrocarbons

Hydrocarbons that contain only single bonds. They are also called alkanes or paraffin hydrocarbons.

Alkyl Group

A group of atoms derived from an alkane by the removal of one hydrogen atom.

Photoelectric Effect

Emission of an electron from the surface of a metal caused by impinging electromagnetic radiation of certain minimum energy, current increases with increasing intensity of radiation.

 

Crystal Lattice Energy

Amount of energy that holds a crystal together, the energy change when a mole of solid is formed from its constituent molecules or ions (for ionic compounds) in their gaseous state.

xenon trioxide

A colorless, nonvolatile solid, XeO3, explosive when dry: in solution it is called xenic acid.