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Refers to substances that crystallize in more than one crystalline arrangement.

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Proton

A subatomic particle having a mass of 1.0073 amu and a charge of +1, found in thew nuclei of atoms.

Functional Group

A group of atoms that represents a potential reaction site in an organic compound.

Boron Hydrides

Binary compounds of boron and hydrogen.

Central Atom

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

Absolute Zero

The zero point on the absolute temperature scale, -273.15°C or 0 K, theoretically, the temperature at which molecular motion ceases. The concept of an absolute zero temperature was first deduced from experiments with gases. When a fixed volume of gas is cooled, its pressure decreases with its temperature. Absolute zero physically possesses quantum mechanical zero-point energy.

Standard Entropy

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

Amine Complexes

Complex species that contain ammonia molecules bonded to metal ions.

Lead Storage Battery

Secondary voltaic cell used in most automobiles.

Phenol

Hydrocarbon derivative containing an [OH] group bound to an aromatic raing.

 

Molarity

Number of moles of solute per litre of solution.