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Any of six colorless, crystalline, isomeric acids having the formula C9H10O2, derived from xylene.

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Diamagnetism

Weak repulsion by a magnetic field.

Percent Purity

The percent of a specified compound or element in an impure sample.

Eluant or eluent

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

 

Excited State

Any state other than the ground state of an atom or molecule.

Atomic Weight

Weighted average of the masses of the constituent isotopes of an element, The relative masses of atoms of different elements.

Law of Conservation of Matter

There is no detectable change in the quantity of matter during an ordinary chemical reaction.

Endothermic

Describes processes that absorb heat energy.

Suspension

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

Semipermable Membrane

A thin partition between two solutions through which certain molecules can pass but others cannot.

Peroxide

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