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I


   
Intermolecular Describes an interaction (e.g., a chemical reaction) between different molecules.
   
Internal energy The sum of the kinetic and potential energies (including electromagnetic field energies) of the particles that make up a system.
   
Intramolecular Describes an interaction (e.g., a chemical reaction) within a single molecule. Intramolecular interactions between widely separated parts of a molecule resemble intermolecular interactions in most respects.
   
Ion An atom or molecule with a net charge.
   
Ionic bond A chemical bond resulting chiefly from the electrostatic attraction between positive and negative ions.
   
Isoelectronic Two molecules are described as isoelectronic if they have the same number of valence electrons in similar orbitals, although they may differ in their distribution of nuclear charges (e.g., H-C N and H-N+ C. KineticPertaining to the rates of chemical reactions. A fast reaction is said to have fast kinetics; if the balance of products in a reaction is controlled by reaction rates rather than by thermodynamic equilibria, the reaction is said to be kinetically controlled.
   

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