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Theory of reaction rates that states that effective collisions between reactant molecules must occur in order for the reaction to occur.

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Standard Electrodes

Half-cells in which the oxidized and reduced forms of a species are present at unit activity, 1.0M solutions of dissolved ions, 1.0atm partial pressure of gases, and pure solids and liquids.

Sigma Orbital

Molecular orbital resulting from head-on overlap of two atomic orbitals.

Amorphous Solid

A noncrystalline solid with no well-defined ordered structure.

Heisenberg Uncertainty Principle

It is impossible to determine accurately both the momentum and position of an electron simultaneously.

Law of Combining Volumes (Gay-Lussac's Law)

At constant temperature and pressure, the volumes of reacting gases (and any gaseous products) can be expressed as ratios of small whole numbers.

 

Formula

Combination of symbols that indicates the chemical composition of a substance.

 

Liquid Aerosol

Colloidal suspension of liquid in gas.

Lone Pair

Pair of electrons residing on one atom and not shared by other atoms, unshared pair.

Explosive limits

The range of concentrations over which a flammable vapour mixed with proper ratios of air will ignite or explode if a source of ignitions is provided.

Eluant or eluent

The solvent used in the process of elution, as in liquid chromatography.