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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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Polymorphous

Refers to substances that crystallize in more than one crystalline arrangement.

Overlap

The interaction of orbitals on different atoms in the same region of space.

Enthalpy

The heat content of a specific amount of substance, defined as E= PV.

Supersaturated Solution

A solution that contains a higher than saturation concentration of solute, slight disturbance or seeding causes crystallization of excess solute.

Octet Rule

Many representative elements attain at least a share of eight electrons in their valence shells when they form molecular or ionic compounds, there are some limitations.

Henry's Law

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

Half-Life

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.

Phosphorus Oxychloride

Colorless to slightly yellow fuming liquid.

Mol. Wt.: 153.39
M.P.: 20C
B.P.: 105.1C
Density: 1.685 @ 15.5C
Vapor Pressure: 40 mm @ 27.3C
Vapor Density: 5.3
Used as the phosphorus source for phosphorus diffusion.

Exothermicity

The release of heat by a system as a process occurs.

Hund's Rule

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