Chapter 19 Oxidation-Reduction Reactions Pg. 595. Oxidation- valence electrons are lost Reduction- valence electrons are gained Rules for determining the oxidation number of an element (pg. 595) Practice assigning Oxidation numbers (pg. 612 #7 a-j) (pg.612 #6). Oxidation-Reduction Reaction.
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Oxidation #increases Oxidation # decreases
1. Zinc-Carbon Dry Cell
a. big, used in flashlights, C and D batteries
b. Zn container – anode, negative, becomes + as loses electron
c. C rod in center – cathode, + bump on end of battery, becomes negative as gains electrons
a. smaller, AA and AAA, cameras, remotes
b. Zn and KOH instead of Zn and C
a. tiny, hearing aids, watches
b. Zn, KOH, Steel, HgO