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An equation giving the concentration of a reactant remaining after a specified time, has different mathematical form for different orders of reactants.

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Percent Composition

The mass percent of each element in a compound.

Isotopes

Two or more forms of atoms of the same element with different masses, atoms containing the same number of protons but different numbers of neutrons.

Substitution Reaction

A reaction in which an atom or a group of atoms is replaced by another atom or group of atoms.

Haber Process

A process for the catalyzed industrial production of ammonia from N2 and H2 at high temperature and pressure.

Weak Electrolyte

A substance that conducts electricity poorly in a dilute aqueous solution.

Resonance

The concept in which two or more equivalent dot formulas for the same arrangement of atoms (resonance structures) are necessary to describe the bonding in a molecule or ion.

Standard Entropy

The absolute entropy of a substance in its standard state at 298 K.

Method of Initial Rates

Method of determining the rate-law expression by carrying out a reaction with different initial concentrations and analyzing the resultant changes in initial rates.

Heat Capacity

The amount of heat required to raise the temperature of a body (of any mass) one degree Celsius.

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.