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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.

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Hydration Energy

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

Law of Conservation of Energy

Energy cannot be created or destroyed, it may be changed from one form to another.

Homonuclear

Consisting of only one element.

Conformations

Structures of a compound that differ by the extent of rotation about a single bond.

First Law of Thermodynamics

The total amount of energy in the universe is constant (also known as the Law of Conservation of Energy) energy is neither created nor destroyed in ordinary chemical reactions and physical changes.

Period

The elements in a horizontal row of the periodic table.

Actual Yield

Amount of a specified pure product actually obtained from a given reaction. Compare with Theoretical Yield.

End Point

The point at which an indicator changes colour and a titration is stopped.

Basic Anhydride

The oxide of a metal that reacts with water to form a base.

Heat of Crystallization

The amount of heat that must be removed from one gram of a liquid at its freezing point to freeze it with no change in temperature.