In class notes for September 26, 2007

In class notes for September 26, 2007 - When it is not 1:1...

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General Chemistry Lecture 102a In class notes for September 26, 2007 OWL Chapter 4 o Acid/Base due 9/27 o Redox problems extended to Monday. Exam 1 regrade request due next Monday. Last time o Anhydrides o Acid/base neutralizations o Redox demo (Ag tree, SO 3 ) Today o Periodcity and oxides o Titrations o Redox Reactions Neutralizations o See A Periodic trends (figure 4.8) These elements are usually found in the form X-O-H o Bases X + O - - H There is a large electronegativity difference between X and O o Acids X – O - + H + Because of the electronegativity between the center atom and the hydrogens o Periodic trends can predict what will react o Metals will give us base anhydrides o Nonmetals usually give acid anhydrides Acid/ Base Titrations (really Chapter 2) o See B
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General Chemistry Lecture 102a In class notes for September 26, 2007 o The endpoint When the indicator turns color The equivalence point is when the moles of acid are equal to the mole of base See C This is used for 1:1 stoichiometry between the acid and the base
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Unformatted text preview: When it is not 1:1, See D Do not apply simple 1:1 equation when it is not 1:1! • Oxidation Reduction Reactions (electron transfer) o Oxidation #’s change o See E o Two ways to follow electrons First way is to follow formal charge • Electrons shared (“covalent”) • See F Oxidation number assumes (“ionic behavior”) and the most electronegative atom gets the electrons • See G • Oxidation numbers work best for ionic compounds See page 170 of Oxtoby (rules of oxidation numbers) See H Be able to identify a redox reaction. o What is oxidized? o Historically it was whenever oxygen was added to a compound o Now we consider oxidation a more general reaction, it occurs when something loses electrons o When it gains electrons, it is called reduction o Be able to know what is oxidized and what is reduced during the reaction....
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This note was uploaded on 02/22/2009 for the course CHEM 102a taught by Professor Hanusa during the Fall '06 term at Vanderbilt.

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In class notes for September 26, 2007 - When it is not 1:1...

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