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A theory of chemical bonding based upon the postulated existence of molecular orbitals.

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Electronic Geometry

The geometric arrangement of orbitals containing the shared and unshared electron pairs surrounding the central atom of a molecule or polyatomic ion.

Fluids

Substances that flow freely, gases and liquids.

Colloid

A heterogeneous mixture in which solute-like particles do not settle out.

Integrated Rate Equation

An equation giving the concentration of a reactant remaining after a specified time, has different mathematical form for different orders of reactants.

Mass Number

The sum of the numbers of protons and neutrons in an atom, an integer.

Heat of Solution

The amount of heat absorbed in the formation of solution that contains one mole of solute, the value is positive if heat is absorbed (endothermic) and negative if heat is released (exothermic).

Particulate Matter

Fine divided solid particles suspended in polluted air.

Adhesive Forces

Forces of attraction between a liquid and another surface.

Crystal Lattice Energy

Amount of energy that holds a crystal together, the energy change when a mole of solid is formed from its constituent molecules or ions (for ionic compounds) in their gaseous state.

Freezing Point Depression

The decrease in the freezing point of a solvent caused by the presence of a solute.ing Point