postclass35 - 1. Quiz 3 this week Ch. 21 (nuclear...

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1. Quiz 3 this week – Ch. 21 (nuclear chemistry), Ch. 22 (nonmetals) 2. Problem set #10 (Chs. 23, 24) due next week - Friday 4/25 at 7:00 am. 3. Final exam: Saturday, May 3 rd ; 9:00 – 11:00 am (2 hours) a. Coverage: full semester (CHE 102 only) b. Format: ACS exam c. Practice problems available in bookstore 4. Current reading: Chs. 23, 24 – Transition Metal Chemistry
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Group 13: Boron Electron config. = 1s 2 2s 2 2p 1 How will octet be satisfied? Gain or share 5 electrons (?)
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Group 13: Boron Electron config. = 1s 2 2s 2 2p 1 How will octet be satisfied? Gain or share 5 electrons (?) H 2 BO 3 - (aq) + 5H 2 O (l) + 8e - BH 4 - (aq) + 8OH - (aq) R = -1.24 V Why such a strong reducing agent? borohydride (BH 4 - ) B H H H H +3 -1 -1 -1 -1 +1 +3 -2 +3 -1 +1 +1
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Group 13: Boron Many exceptions to “octet rule” Electron config. = 1s 2 2s 2 2p 1 B H H H B Cl Cl Cl B CH 3 H 3 C CH 3 borane trichloroborane trimethylborane Formal charge = (# valence electrons) – (# lone pair electrons) – ½(# bonding electrons) FC H = 1 – 0 – ½(2) = 0 FC B = 3 – 0 – ½(6) = 0
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This note was uploaded on 05/14/2008 for the course CHE 102 taught by Professor Watson during the Spring '08 term at SUNY Buffalo.

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postclass35 - 1. Quiz 3 this week Ch. 21 (nuclear...

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