ADDENDUM_CH_4_REDOX_Fall_2006

ADDENDUM_CH_4_REDOX_Fall_2006 - OXIDATION-REDUCTION...

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OXIDATION-REDUCTION REACTIONS –  aka.  REDOX (Sections 5-4, 5-5, 5-6) THE CLASSIC REDOX REACTION: GUNPOWDER “Greek fire” – defense of Byzantium in 7 th  Century naphtha (from natural crude oil) 11 th  Cent. – ‘nitre’ = KNO 3  boosted incendiary properties Where do you get nitre? – under pigsties and stables                   soil bacteria Urea   =======>   nitrate ion Add lime to the soil – extract with water – concentrate – Ppt. NaCl (least soluble salt) – cool / xlize KNO Approx. reactions of ‘black powder’
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10 KNO 3 (s) + 12 C(s) + 4 S(s) ==> 5 K 2 CO 3 (s) + 4 SO 2 (g) +  5 N 2 (g)   + 7 CO(g) typical composition: 75% KNO 3 , 15 % C, 10% S obsolete as blasting agent now // best fuse and igniter  composition ever developed MAIN REQUIREMENT OF EXPLOSIVE: solid or liquid that converts  quickly to gases with liberation of lots of energy … THAT’S REDOX any reaction in which oxygen is added to a substance = OXIDATION
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ADDENDUM_CH_4_REDOX_Fall_2006 - OXIDATION-REDUCTION...

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