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The mass of one formula unit of a substance in atomic mass units.

 

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Degenerate

Of the same energy.

Law of Conservation of Energy

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

Intermolecular Forces

Forces between individual particles (atoms, molecules, ions) of a substance.

Bond Order

Half the numbers of electrons in bonding orbitals minus half the number of electrons in antibonding orbitals. Bond order gives an indication to the stability of a bond. Also defined as the difference between the number of bonding electrons and antibonding electrons divided by two.

Half-Cell

Compartment in which the oxidation or reduction half-reaction occurs in a voltaic cell.

Hydration Energy

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

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.

Partial Pressure

The pressure exerted by one gas in a mixture of gases.

Accuracy

How closely a measured value agrees with the correct value.

Aufbau ('building up') Principle

Describes the order in which electrons fill orbitals in atoms.