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The number of repeating corresponding points on a wave that pass a given observation point per unit time.

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Molality

Concentration expressed as number of moles of solute per kilogram of solvent.

Sigma Orbital

Molecular orbital resulting from head-on overlap of two atomic orbitals.

Oxide

A binary compound of oxygen.

Denaturation

A process pertaining to a change in structure of a protein form regular to irregular arrangement of the polypeptide chains.

Nernst Equation

Corrects standard electrode potentials for nonstandard conditions.

Equivalence Point

The point at which chemically equivalent amounts of reactants have reacted.

Combustible

Classification of liquid substances that will burn on the basis of flash points. A combustible liquid means any liquid having a flash point at or above 37.8°C (100°F) but below 93.3°C (200°F), except any mixture having components with flash points of 93.3°C (200°F) or higher, the total of which makes up 99 percent or more of the total volume of the mixture.

Catalyst

A substance that speeds up a chemical reaction without being consumed itself in the reaction.
A substance that alters (usually increases) the rate at which a reaction occurs.

Detergent

A soap-like emulsifer that contains a sulfate, SO3 or a phosphate group instead of a carboxylate group.

Calorie

The amount of heat required to raise the temperature of one gram of water from 14.5°C to 15.5°C. 1 calorie = 4.184 joules.