Lecture6SHWeb

Lecture6SHWeb - Mon. Sept. 21, 2011 Todays Lecture Types of...

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1 Mon. Sept. 21, 2011 Today’s Lecture Types of Chemical Reactions and Solution Stoichiometry • 4.9 Acid Base Reactions • 4.10-4.11 Oxidation/Reduction Reactions Lecture 6
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3 Oxidation of copper metal by nitric acid.
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4 Na/H 2 O
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5 Oxidation-reduction reactions (Redox reactions): • a reaction in which one or more electrons are transferred between atoms or molecules 2Na (s) + Cl 2(g) 2NaCl (s) 2Na (s) + 2H 2 O (aq) 2Na + (aq) + 2OH - (aq) + ____ • oxidation states: – monoatomic ions: oxidation state = charge – covalent bond: » imaginary charges that would result if electrons were to be assigned to the atom with greater affinity instead of sharing.
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6 – Example: • Convention: – actual charges (cation, anion) are written as: »2-, 1+, etc – oxidation states as: »-2, +1, etc O H H δ+ 2δ- 2δ- δ+ Oxidation States O H -2 +1
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7 – Rules for assigning oxidation states: 1 the oxidation state of an atom in an element is : Na, Cl
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Lecture6SHWeb - Mon. Sept. 21, 2011 Todays Lecture Types of...

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