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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.

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Critical Pressure

The pressure required to liquefy a gas (vapor) at its critical temperature.

Biodegradability

The ability of a substance to be broken down into simpler substances by bacteria.

 

Melting Point

The temperature at which liquid and solid coexist in equilibrium, also the freezing point.

Molecular Equation

Equation for a chemical reaction in which all formulas are written as if all substances existed as molecules, only complete formulas are used.

Atomic Number


Integral number of protons in the nucleus, defines the identity of element.
 

Mechanism

The sequence of steps by which reactants are converted into products.

Molecular Weight

The mass of one molecule of a nonionic substance in atomic mass units.

Excited State

Any state other than the ground state of an atom or molecule.

Square Planar Complex

Complex in which the metal is in the center of a square plane, with ligand donor atoms at each of the four corners.

Ligand

A Lewis base in a coordination compound.