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An artificially induced nuclear reaction caused by the bombardment of a nucleus with subatomic particiles or small nucei.

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Nucleus

The very small, very dense, positively charged center of an atom containing protons and neutrons, as well as other subatomic particles.

Law of Combining Volumes (Gay-Lussac's Law)

At constant temperature and pressure, the volumes of reacting gases (and any gaseous products) can be expressed as ratios of small whole numbers.

 

Enzyme

A protein that acts as a catalyst in biological systems.

Mixture

A sample of matter composed of two or more substances, each of which retains its identity and properties.

Polar Bond

Covalent bond in which there is an unsymmetrical distribution of electron density.

Compound

A substance of two or more elements in fixed proportions. Compounds can be decomposed into their constituent elements.

Coefficient of expansion

The ratio of the change in length or volumen of a body to the original lengthor volume for a unit change in temperature.

Electrophile

Positively charged or electron-deficient.

Degenerate

Of the same energy.

Activity of a component of ideal mixture

A dimensionless quantity whose magnitude is: equal to molar concentration in an ideal solution, equal to partial pressure in an ideal gas mixture, and defined as 1 for pure solids or liquids.