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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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Oxidation

An algebraic increase in the oxidation number, may correspond to a loss of electrons.

Semipermable Membrane

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

Periodicity

Regular periodic variations of properties of elements with atomic number (and position in the periodic table).

Radioactivity

The spontaneous disintegration of atomic nuclei.

Equation of State

An equation that describes the behavior of matter in a given state, the van der Waals equation describes the behavior of the gaseous state.

Nitric Acid

HNO3: A strong acid, it is toxic and can cause severe burns. Transparent colorless or yellowish, fuming, suffocating, caustic and corrosive liquid. Nitric acid boiling point is 83C. A 70 percent solution is used in the S.S.E. laboratory for junction depth measurements. Nitric acid is also present in the metal etch solution used for the Aluminum etch procedure.

Heterocyclic Amine

Amine in which the nitrogen is part of a ring.

Saturated Solution

Solution in which no more solute will dissolve.

Homogeneous Catalyst

A catalyst that exists in the same phase (solid, liquid or gas) as the reactants. The process is called Homogeneous Catalysis.

Ore

A natural deposit containing a mineral of an element to be extracted.