lect_16nov3f08

lect_16nov3f08 - Outline 16 3-OCT-2008 1. Review- Redox...

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1 Outline 16 3-OCT-2008 1. Review- Redox oxidation number assignment 2. Redox- (continued) agents (cause oxidation or reduction) 3. Redox – (continued) balancing
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2 O.N. Rules (Review) 1. Element (uncombined); O.N.= 0 ; ex: P 4 , O 2 , O 3 , K, Fe 2. Group 1A and 2A metals; O.N.= +1 or +2 (group #) 3. Sum O.N. = net charge on specie (molecule or ion) 4. F; O.N.= -1 (group # - 8) 5. H; O.N. = +1 (group#); But: in LiH (rules2 & 3) O.N.= -1 6. O; O.N.= -2 (group # - 8); But: OF 2 ( rules 4 & 3) O.N.= +2; But: NaO 2 (rules 2 & 3) O.N.= -(1/2),etc. 7. Cl, Br, I; -1 (group# - 8); But: oxoanions (rules 3& 6) O.N.= +7 for Cl in ClO 4 - , etc. Earlier Rules “Trump” later rules. Print slide and use for problem solving.
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3 REDOX ( DID LAST TIME ) (Practice with assigning O.N.’s Ex: Find O.N. of following elements ( bold ) • a. Mn O 4 - • b. F 2 O • c. K 2 O 2 • d. H 2 As O 3 - • e. Cl O 3 -
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4 Chemical Reaction Types (Redox) Applying Rules (more practice) Ex: 4.61 (b), p.171. Find O.N. s in BrF 3 Ex: 4.60 (c), p.171. Find O.N. s in HCO 3 - Ex: 4.63 (c), p.171. Find O.N. s in SOCl 2
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5 Redox , Background Background of Redox Terminology Reduction- Small amount of metal is reduced from large amount of metal ore. Ex: 2Fe 2 O 3 + 3 C → 4 Fe + 3CO 2 Fe went from O.N. = +3 to O.N.= 0 C went from O.N.= 0 to O.N. = +4.
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Redox, Background Background of Redox Terminology Oxidation- Something reacts with oxygen. ex:
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This note was uploaded on 02/18/2009 for the course CHEM 1A taught by Professor Okamura during the Fall '08 term at UC Riverside.

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lect_16nov3f08 - Outline 16 3-OCT-2008 1. Review- Redox...

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