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Compound derived from a carbonic acid by replacing the --OH group with a halogen (X), usually --Cl, general formula is O R--C--X.

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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.

Radioactive Dating

Method of dating ancient objects by determining the ratio of amounts of mother and daughter nuclides present in an object and relating the ratio to the object?s age via half-life calculations.

Lone Pair

Pair of electrons residing on one atom and not shared by other atoms, unshared pair.

Heavy Water

Water containing deuterium, a heavy isotope of hydrogen.

Phase Diagram

Diagram that shows equilibrium temperature-pressure relationships for different phases of a substance.

Endothermic

Describes processes that absorb heat energy.

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.

Band Theory of Metals

Theory that accounts for the bonding and properties of metallic solids.

Specific Heat

The amount of heat required to raise the temperature of one gram of substance one degree Celsius.

Exothermicity

The release of heat by a system as a process occurs.