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The time required for half of a reactant to be converted into product(s). The time required for half of a given sample to undergo radioactive decay.

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Alpha Particles

A helium nucleus.

Binary Acid

A binary compound in which H is bonded to one or more of the more electronegative nonmetals.

Carbonium ion

An orgainic ion carrying a positive charge on a carbon atom.

Leveling Effect

Effect by which all acids stronger than the acid that is characteristic of the solvent react with solvent to produce that acid, similar statement applies to bases. The strongest acid (base) that can exist in a given solvent is the acid (base) characteristic of the solvent.

Emulsion

Colloidal suspension of a liquid in a liquid.

Ester

A Compound of the general formula R-C-O-R1 where R and R1 may be the same or different, and may be either aliphatic or aromatic.

Photon

A packet of light or electromagnetic radiation, also called quantum of light.

 

Electrodes

Surfaces upon which oxidation and reduction half-reactions, occur in electrochemical cells.

Lanthanide Contraction

A decrease in the radii of the elements following the lanthanides compared to what would be expected if there were no f-transition metals.

Reactants

Substances consumed in a chemical reaction.