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An experimentally determined (proportionality) constant, which is different for different reactions and which changes only with temperature, k in the rate-law expression: Rate = k [A] x [B]v.

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Nucleons

Particles comprising the nucleus, protons and neutrons.

Chemical Equation

Description of a chemical reaction by placing the formulas of the reactants on the left and the formulas of products on the right of an arrow.

Stoichiometry

Description of the quantitative relationships among elements and compounds as they undergo chemical changes.

S Orbital

A spherically symmetrical atomic orbital, one per energy level.

Plasma

A physical state of matter which exists at extremely high temperatures in which all molecules are dissociated and most atoms are ionized.

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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.

Hydrolysis Constant

An equilibrium constant for a hydrolysis reaction.

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.

Formula

Combination of symbols that indicates the chemical composition of a substance.