Lewis, Gilbert acids/bases

A third definition is based on the valance electron structures developed by Gilbert N. Lewis and does not involve the components of water. The Lewis definition states that substances that can accept electrons in an aqueous solution are acids, and substances that can donate electrons in an aqueous solution are bases. We will revisit Lewis s acid-based theory in Lesson 15, Acid and Bases. ... 

Equations (7) and (8) can also be explained by American chemist Gilbert Lewis s acid-base theory. A Lewis acid is a substance that can accept a pair of electrons to form a new bond, and a Lewis base is a substance that can donate a pair of electrons to form a new bond. 

Leuprolide, structure of, 1056 I.evorotatory, 295 Lewis, Gilbert Newton. 8 Lewis acid, 57-58 examples of, 58 reactions of, 57-58 Lewis base, 57, 59-60 examples of, 59 reactions of, 59-60 Lewis structure, 9 resonance and, 43 Lexan, structure and uses of, 819,... 

Lewis, Gilbert Newton, 166,174 Lewis acid A species that accepts an electron pair in an acid-base reaction, 410 Lewis base A species that donates an... 

In 1923, the same year that Bransted and Lowry came up with their idea of what acids and bases were, an American chemist named Gilbert Newton Lewis began to work on his own acid-base theory. Lewis defined acid as any substance that accepted an electron pair. A base, on the other hand, is any substance that donates an electron pair. 

In the same year that Bronsted and Lowry proposed their definition of acids and bases, an American chemist named Gilbert Lewis proposed an alternative definition that not only encompassed Bronsted-Lowry theory but also accounted for acid-base reactions in which a hydrogen ion isn t exchanged. Lewis s definition relies on tracking lone pairs of electrons. Under his theory, a base is any substance that donates a pair of electrons to form a coordinate covalent bond with another substance, while an acid is a substance that accepts that electron pair in such a reaction. As we explain in Chapter 5, a coordinate covalent bond is a covalent bond in which both of the bonding electrons are donated by one of the atoms forming the bond. 

LEWIS, GILBERT N. 11875-1946). An American chemist, native of Massachusetts, professor of chemistry at MIT from 1905 to 1912 after which he became dean of chemistry at the University of California at Bcikeley. His inosi creative contribution was the eleciroh-pair theory of acids and bases, which laid the groundwork lor coordination chemistry. He was also a leading authority on thermodynamics. 

In the 1920s, Gilbert N. Lewis proposed that bases donate unshared electron pairs to acids, regardless of whether the donation is made to a proton or to another atom. Boron trifluoride is an example of a Lewis acid that is not a Bronsted acid because it is a chemical that accepts an electron pair without involving an H+ ion ... 

The final acid-base theory that we shall consider was proposed by chemist Gilbert Lewis in the early 1920s. The Lewis Theory is the most general, including more substances under its definitions than the other theories of acids and bases. A Lewis acid is a substance that accepts a pair of electrons to form a covalent bond. A Lewis base is a substance that provides a pair of electrons to form a covalent bond. In order for a substance to act as a Lewis base, it must have a pair of unshared electrons in its valence shell. An example of this is seen when a hydrogen ion attaches to the unpaired electrons of oxygen in a water molecule, as shown here ... 

Lewis, Gilbert N. (1875-1946). Proposed electron-pair theory of acids and bases authority on thermodynamics. 

The final acid-base concept we consider was developed by Gilbert N. Lewis, whose contribution to understanding the importance of valence electron pairs in molecular bonding we discussed in Chapter 9. Whereas the Brpnsted-Lowry concept focuses on the proton in defining a species as an acid or a base, the Lewis concept highlights the role of the electron pair. The Lewis acid-base definition holds that... 

In the early 1930s Gilbert Lewis, an American chemist, proposed a more general acid-base theory that is based on sharing electron pairs rather than... 

SEE ALSO Acid-Base Chemistry Arrhenius, Svante Brdnsted, Johannes Nicolaus Chemical Reactions Lewis, Gilbert N. Solution Chemistry. 

Electron sharing reactions. These reactions are also known as Lewis acid-base reactions (Gilbert Newton Lewis, American chemist) and involve the donation of electrons from an electron-rich species like the hydroxide ion to an electron deficient species like the lead ion. The product of these reactions are referred to as adducts or complexes. 

The American chemist Gilbert Lewis (1875-1945) introduced his electronic theory of acid-base interactions in 1924. 

This classification was still not qrrite satisfadory for American chemist Gilbert Lewis (1875-1946)—or at least one corrld irrragine this had he not published his thoughts in the same year as Bronsted arrd Lowry (1923). Lewis notion was that hydrogen is present in many substances, but not all of them, whereas electrons are present in every substance. So, in the Lewis acid-base theory, electrons (or electron pairs, to be more precise) play central roles. In this theory a molectrle that can accept an electron pair plays the role of an acid. Conversely, a base can donate an electron pair ... 

In 1923, Gilbert Newton Lewis defined an acid as an electron pair acceptor and a base as an electron pair donor. This definition is even more inclusive than the previous one because it includes all Bronsted-Lowry acids and bases as a subset and provides the foundation for the field of coordination chemistry. A coordination compound is the product of a Lewis acid-base reaction, such as the one shown in Equation (14.11) and Figure 14.5, in which the metal ion (Lewis acid) and ligand (Lewis base) are held together by a coordinate covalent bond. 

A more general concept of acids and bases was introduced by Gilbert N. Lewis. The Lewis theory deals with the way in which a substance with an unshared pair of electrons reacts in an acid-base type of reaction. According to this theory, a base is any substance that has an unshared pair of electrons (electron pair donor), and an acid is any substance that will attach itself to or accept a pair of electrons. 

Lewis, Gilbert Newton (1875-1946) American physical chemist who developed theories on chemical thermodynamics, atomic structure, and atomic bonding. He pioneered work on the electronic theory of valency, showing the difference between ionic and covalent bonds. He defined an acid as an electron acceptor and a base as an electron donor. 

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