L19-Chemical_Reactions_and_Stoichiometry

L19-Chemical_Reactions_and_Stoichiometry - Part III...

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Unformatted text preview: Part III: Chemical Reactions and Stoichiometry Oxidation and Reduction Acid- Base Defnitions/ Descriptions The Lewis Theory An acid is any species that can accept a share in an electron pair. A base is any species that can make available, or donate, a share in an electron pair The Brønsted- Lowry Theory An acid is a proton donor and a base is a proton acceptor. The Arrhenius Theory An acid is a substance that contains hydrogen and produces H + in aqueous solution. A base is a substance that contains the -OH group and produces hydroxide ions (OH- ) in aqueous solution. Acid- Base Defnitions/ Descriptions: Key Features The Lewis Theory ☛ Lewis base has a lone pair of electrons to donate ☛ Lewis acid has a vacant orbital that can accept a donated pair of electrons and form a new bond The Brønsted- Lowry Theory ☛ Transfer of a proton from a stronger acid to a stronger base The Arrhenius Theory ☛ Formation of water from H + and OH- Lewis Acid- Base Reactions The product of any Lewis Acid- Base reaction is called an adduct a single species that contains a new covalent bond A B 1 2 3 4 Lewis Acid- Base Reactions The product of any Lewis Acid- Base reaction is called an adduct a single species that contains a new covalent bond A B adduc t Lewis Acids and Bases Molecular Lewis acids Lewis acids with electron- deFcient atoms most important ones: covalent compounds boron and aluminum F B F F N H H H + B F N H H H F F Lewis Acids and Bases Molecular Lewis acids Lewis acids with polar multiple bonds...
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This note was uploaded on 09/24/2009 for the course CHEM 333 taught by Professor Baird during the Spring '09 term at UC Davis.

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L19-Chemical_Reactions_and_Stoichiometry - Part III...

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