Class Notes Mar 08

Class Notes Mar 08 - 3/8/2010 Announcements: Monday, March...

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3/8/2010 1 Announcements: Monday, March 8, 2010 Homework WebAssign #9- Due Thursday , March 11 at 8:00 AM Recitation Week 9 – Electrochemistry Lab - Voltaic Electrochemical Cells Complete your prelab before recitation. BRING GLOVES! Suggested Textbook Questions Continue Chapter 22 problems and reading. What is the oxidation state of chromium in K 2 Cr 2 O 7 ? March 8, 2010 - CT#1 A. +12 B. +7 D. +3 E. +1 C. +6 2(K) + 2(Cr) + 7(O) = 0 2(+1) + 2(x) + 7(-2) = 0 2 + 2x -14 = 0 2x 12 = 0 2x = 12 x = 6 Oxidation States of Transition Metals Transition metals can have multiple oxidation states. Ex. Cu + and Cu 2+ or Fe 2+ and Fe 3+ Three common oxidation states of manganese: Mn 2+ , Mn 6+ (in MnO 4 2- ) and Mn 7+ (in MnO 4 - ) Oxidation States of Transition Metals For elements in groups 3B(3) through 7B(7), the highest oxidation state is equal to the group number. Found in oxoanions like MnO 4 - , Cr 2 O 7 2- and VO 4 3- . For elements in groups 8B(8), 8B(9) and 2B(12), the highest oxidation state is less than the group number. Not all of the d electrons can be removed.
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Class Notes Mar 08 - 3/8/2010 Announcements: Monday, March...

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