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  2. Ralph Pearson - Wikipedia

    en.wikipedia.org/wiki/Ralph_Pearson

    Ralph Gottfrid Pearson (January 12, 1919 – October 12, 2022) was an American physical inorganic chemist best known for the development of the concept of hard and soft acids and bases (HSAB). He received his Ph.D. in physical chemistry in 1943 from Northwestern University , and taught chemistry at Northwestern faculty from 1946 until 1976 ...

  3. HSAB theory - Wikipedia

    en.wikipedia.org/wiki/HSAB_theory

    HSAB theory is also useful in predicting the products of metathesis reactions. In 2005 it was shown that even the sensitivity and performance of explosive materials can be explained on basis of HSAB theory. [2] Ralph Pearson introduced the HSAB principle in the early 1960s [3] [4] [5] as an attempt to unify inorganic and organic reaction ...

  4. File:GeneralChemistry.pdf - Wikipedia

    en.wikipedia.org/wiki/File:GeneralChemistry.pdf

    You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.

  5. General chemistry - Wikipedia

    en.wikipedia.org/wiki/General_chemistry

    General chemistry (sometimes referred to as "gen chem") is offered by colleges and universities as an introductory level chemistry course usually taken by students during their first year. [1] The course is usually run with a concurrent lab section that gives students an opportunity to experience a laboratory environment and carry out ...

  6. Klopman–Salem equation - Wikipedia

    en.wikipedia.org/wiki/Klopman–Salem_equation

    In the theory of chemical reactivity, the Klopman–Salem equation describes the energetic change that occurs when two species approach each other in the course of a reaction and begin to interact, as their associated molecular orbitals begin to overlap with each other and atoms bearing partial charges begin to experience attractive or repulsive electrostatic forces.

  7. The Grammar of Science - Wikipedia

    en.wikipedia.org/wiki/The_Grammar_of_Science

    The ether is a purely conceptual medium which, as far as theory is at present developed, is structureless except that at isolated points there exist centres at which its properties are exceptional. These centres, by their mutual motion and grouping, constitute the model of the sequence of natural phenomena.

  8. Koopmans' theorem - Wikipedia

    en.wikipedia.org/wiki/Koopmans'_theorem

    For example, the electronic configuration of the H 2 O molecule is (1a 1) 2 (2a 1) 2 (1b 2) 2 (3a 1) 2 (1b 1) 2, [10] where the symbols a 1, b 2 and b 1 are orbital labels based on molecular symmetry. From Koopmans’ theorem the energy of the 1b 1 HOMO corresponds to the ionization energy to form the H 2 O + ion in its ground state (1a 1) 2 ...

  9. Valence bond theory - Wikipedia

    en.wikipedia.org/wiki/Valence_bond_theory

    An important aspect of the valence bond theory is the condition of maximum overlap, which leads to the formation of the strongest possible bonds. This theory is used to explain the covalent bond formation in many molecules. sp 3 hybridization in methane forms four equivalent sigma bonds with tetrahedral geometry.