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A group of atoms that represents a potential reaction site in an organic compound.

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Chemical Kinetics

The study of rates and mechanisms of chemical reactions and of the factors on which they depend.

Band of Stability

Band containing nonradioactive nuclides in a plot of number of neutrons versus atomic number.

Nonpolar Bond

Covalent bond in which electron density is symmetrically distributed.

Kinetic Energy

Energy that matter processes by virtue of its motion.

Chemical Bonds

The attractive forces that hold atoms together in elements or compounds.

What are Compound Microscopes?

Most of the microscopes used today are compound. A compound microscope features two or more lenses. A hollow cylinder called the tube connects the two lenses.

The top lens, the one people look through, is called the eyepiece. The bottom lens is known as the objective lens. Below the two lenses is the stage, with the illuminator below that.

Effective Nuclear Charge

The nuclear charge experienced by the outermost electrons of an atom, the actual nuclear charge minus the effects of shielding due to inner-shell electrons.
Example: Set of dx2-y2 and dz2 orbitals, those d orbitals within a set with lobes directed along the x-, y-, and z-axes.

Nuclear Reaction

Involves a change in the composition of a nucleus and can evolve or absorb an extraordinarily large amount of energy.

Adhesive Forces

Forces of attraction between a liquid and another surface.

Aldehyde

Compound in which an alkyl or aryl group and a hydrogen atom are attached to a carbonyl group and a hydrogen atom are attached to a carbonyl group, general formula, O-R-C-H