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An atomic emission or absorption spectrum.

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Most Popular

Boyle's Law

At constant temperature the volume occupied by a definite mass of a gas is inversely proportional to the applied pressure.


The time required for half of a reactant to be converted into product(s). The time required for half of a given sample to undergo radioactive decay.

Chemical Bonds

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

Critical Point

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

Ternary Acid

A ternary compound containing H, O, and another element, often a nonmetal.

Hydration Energy

The energy change accompanying the hydration of a mole of gase and ions.

Forbidden Zone

A relatively large energy separation between an insulator's highest filled electron energy band and the next higher energy vacant band. Beginning in the fourth energy level, a set of seven degenerate orbitals per energy level, higher in energy than s, p, and d orbitals of the same energy level.

Native State

Refers to the occurrence of an element in an uncombined or free state in nature.


Acetic Acid

CA3COOH, clear, colorless liquid, pungent odor. Boiling point 140C, flash point 54C (closed cup), autoignition temperature 38OC.


Classification of liquid substances that will burn on the basis of flash points. A combustible liquid means any liquid having a flash point at or above 37.8°C (100°F) but below 93.3°C (200°F), except any mixture having components with flash points of 93.3°C (200°F) or higher, the total of which makes up 99 percent or more of the total volume of the mixture.