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Binary compounds of boron and hydrogen.

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Le Chatelier's Principle

States that a system at equilibrium, or striving to attain equilibrium, responds in such a way as to counteract any stress placed upon it.
If a stress (change of conditions) is applied to a system at equilibrium, the system shifts in the direction that reduces stress.

van der Waals' Equation

An equation of state that extends the ideal gas law to real gases by inclusion of two empirically determined parameters, which are different for different gases.

Accuracy

How closely a measured value agrees with the correct value.

Atmosphere

A unit of pressure, the pressure that will support a column of mercury 760 mm high at 0 °C.

Control Rods

Rods of materials such as cadmium or boron steel that act as neutron obsorbers (not merely moderaters) used in nuclear reactors to control neutron fluxes and therfore rates of fission.

Formula Weight

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

 

Alkaline Battery

A dry cell in which the electrolyte contains KOH.

D-Orbitals

Beginning in the third energy level, aset of five degenerate orbitals per energy level, higher in energy than s and p orbitals of the same energy level.

 

Electrolytic Conduction

Conduction of electrical current by ions through a solution or pure liquid.

Allotropic Modifications (Allotropes)

Different forms of the same element in the same physical state.