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An oxidizing or reducing agent, who's mass gains (oxidizing agents) or loses (reducing agents) 6.022 x 1023 electrons in a redox reaction.
The mass of an acid or base that furnishes or reacts with 6.022 x 1023 H3O+ or OH- ions.

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Heterogeneous Mixture

A mixture that does not have uniform composition and properties throughout.

Critical Point

The combination of critical temperature and critical pressure of a substance.

Curie (Ci)

The basic unit used to describe the intensity of radioactivity in a sample of material. One curie equals 37 billion disintegrations per second or approximately the amount of radioactivty given off by 1 gram of radium.

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.

Film badge

A small patch of photographic film worn on clothing to detect and measure accumulated incident ionizing radiation.

Enantiomer

One of the two mirror-image forms of an optically active molecule.

Mass Number

The sum of the numbers of protons and neutrons in an atom, an integer.

Activation Energy

Amount of energy that must be absorbed by reactants in their ground states to reach the transition state so that a reaction can occur. In other words, activation energy is the minimum energy required for a chemical reaction to occur.

Nucleons

Particles comprising the nucleus, protons and neutrons.

Polymerization

The combination of many small molecules to form large molecules.