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The law stating that a pure substance will always have the same percent by weight. Different samples of a pure compound always contain the same elements in the same proportions by mass.

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Chemical Change

A change in which one or more new substances are formed.

Hund's Rule

All orbitals of a given sublevel must be occupied by single electrons before pairing begins.

Raoult's Law

The vapor pressure of a solvent in an ideal solution decreases as its mole fraction decreases.

Crystal Field Theory

Theory of bonding in transition metal complexes in which ligands and metal ions are treated as point charges, a purely ionic model, ligand point charges represent the crystal (electrical) field perturbing the metal?s d orbitals containing nonbonding electrons.

End Point

The point at which an indicator changes colour and a titration is stopped.

Mother Nuclide

Nuclide that undergoes nuclear decay.

Cis-Trans Isomerism

A type of geometrical isomerism related to the angles between like ligands.

Hydrate Isomers

Isomers of crystalline complexes that differ in whether water is present inside or outside the coordination sphere.

Dissociation

In aqueous solution, the process in which a solid ionic compound separates into its ions.

Essential Oil

A plant extract that has a distinctive odour or flavour.