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Describes processes that absorb heat energy.

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Pairing Energy

Energy required to pair two electrons in the same orbital.

Central Atom

An atom in a molecule or polyatomic ion that is bonded to more than one other atom.

Acid

A substance that produces H+(aq) ions in aqueous solution. Strong acids ionize completely or almost completely in dilute aqueous solution. Weak acids ionize only slightly. Chemicals or substances having the property of an acid are said to be acidic.

Ferromagnetism

The ability of a substance to become permanently magnetized by exposure to an external magnetic field.

Condensation

Liquefaction of vapor.

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.

Standard Entropy

The absolute entropy of a substance in its standard state at 298 K.

Frasch Process

Method by which elemental sulfur is mined or extracted. Sulfur is melted with superheated water (at 170°C under high pressure) and forced to the surface of the earth as a slurry.

 

Fluorescence

Absorption of high energy radiation by a substance and subsequent emission of visible light.

Alpha (a) Particle

Helium ion with 2+ charge, an assembly of two protons and two neutrons.