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The amount of heat absorbed in the formation of one mole of a substance in a specified state from its elements in their standard states.

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yield

The quantity of product formed by the interaction of two or more substances, generally expressed as a percentage of the quantity obtained to that theoretically obtainable.

Alpha Particles

A helium nucleus.

Henry's Law

The pressure of the gas above a solution is proportional to the concentration of the gas in the solution.

Standard Entropy

The absolute entropy of a substance in its standard state at 298 K.

Cation

A positive ion, an atom or group of atoms that has lost one or more electrons.

Boyle's Law

At constant temperature the volume occupied by a definite mass of a gas is inversely proportional to the applied pressure.

Phosphoric Acid

H3P04, Colorless liquid or rhombic crystals, decomposes before it will boil. Used mostly in the metal etchant. Used in cleaning operations to remove encrusted surface matter and mineral scale found on metal equipment such as boilers and steam producing equipment. Also used to brighten metals and remove rust.

Alkaline Earth Metals

Group IIA metals

Avogadro's Number

The number (6.022x10^23) of atoms, molecules or particles found in exactly 1 mole of substance.

Peroxide

A compound containing oxygen in the -1 oxidation state. Metal peroxides contain the peroxide ion, O22