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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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Heterogeneous Mixture

A mixture that does not have uniform composition and properties throughout.

xylidine

Any of six isomeric compounds that have the formula C8H11N, are derivatives of xylene, and resemble aniline: used in dye manufacture.

Chemical Bonds

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

Adhesive Forces

Forces of attraction between a liquid and another surface.

Law of Definite Proportions (Law of Constant Composition)

The law stating that a pure substance will always have the same percent by weight. Different samples of a pure compound always contain the same elements in the same proportions by mass.

Cohesive Forces

All the forces of attraction among particles of a liquid.

Accuracy

How closely a measured value agrees with the correct value.

Condensed States

The solid and liquid states.

Dipole Moment

The product of the distance separating opposite charges of equal magnitude of the charge, a measure of the polarity of a bond or molecule, a measured dipole moment refers to the dipole moment of an entire molecule.

Background Radiation

Ratiation extraneous to an experiment. Usually the low-level natural radiation form cosmic rays and trace radioactive substances present in our environment.