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Negative logarithm of the concentration (mol/L) of the H3O+[H+] ion, scale is commonly used over a range 0 to 14.

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Heterogeneous Equilibria

Equilibria involving species in more than one phase.

Deposition

The direct solidification of a vapor by cooling, the reverse of sublimation.

Effective Molality

The sum of the molalities of all solute particles in a solution.

Chain Reaction

A reaction that, once initiated, sustains itself and expands. This is a reaction in which reactive species, such as radicals, are produced in more than one step. These reactive species, radicals, propagate the chain reaction.

 

Born-Haber Cycle

A series of reactions (and accompanying enthalpy changes) which, when summed, represents the hypothetical one-step reaction by which elements in their standard states are converted into crystals of ionic compounds (and the accompanying enthalpy changes.)

Atom

The smallest particle of an element.

Cohesive Forces

All the forces of attraction among particles of a liquid.

Accuracy

How closely a measured value agrees with the correct value.

Atomic Orbital

Region or volume in space in which the probability of finding electrons is highest.

Autoionization

An ionization reaction between identical molecules.