Chemistry 36 Friday, December 1, 2006

Chemistry 36 Friday, December 1, 2006 - 2OH 1- +H 2-0.83V...

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Friday, December 01, 2006 Chemistry BATTERIES INCLUDED Text: Sections 11.6-11.8 BATTERIES Galvanic Cells e- go through external circuit work is extracted (=-∆G) Dry Cell Battery 2 MnO 2 + Zn + 2 NH 4 1+ Mn 2 O 3 + Zn 2+ +2 NH 3 + H 2 O (+4) (0) (+3) (+2) FIGURE 11.5 Graphite: an “inert electrode” Conducts, but C not involved in redox Alkaline battery 2 MnO 2 + Zn + H 2 O Mn 2 O 3 + Zn(OH) 2 (+4) (0) (+3) (+2) Silver Battery Ag 2 O + Zn 2 Ag + ZnO (+1) (0) (0) (+2) Lithium Battery Replace Zn with Li Li: Stronger reducing agent Cell has higher voltage Lead-acid Battery (car) PbO 2 + Pb + 2 H 2 SO4 2 PbSO 4 + 2 H 2 O (+4) (0) (+2) FIGURE 11.7 Lead Storage Battery To Recharge run reaction backwards!
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Friday, December 01, 2006 OTHER REDOX PROCESSES 1. corrosion a. unwanted oxidation i. tarnish, rust (Fig 11.8) FIGURE 11.8 2. electrolytic cells a. external supply pushes e- uphill in E b. reaction driven I non-spontaneous direction Ex. rechargeable batteries Ex. Cl2 production (ll million tons - 2003) chloral kali industry r: 2 H 2 O + 2e-
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Unformatted text preview: 2OH 1- +H 2-0.83V o: 2Cl 1- Cl 2 + 2e-+1.36V 2 H 2 O + 2Cl 1- Cl 2 +H 2 +2OH 1- -2.19V GOAL Identify (not memorize) the cathode and anode reactions in a battery REACTION TYPES How does reaction types correlate with e- flow? How do you distinguish reaction type from chemical equation? Text: Not in Text PIC RECOGNIZING REACTION TYPES Redox Change in oxidation state May be accompanied by bond formation o Ex. H 2 + Cl 2 2 HCl Precipitation soluble reactants form insoluble ionic product o Ex. Pb(NO 3 ) 2 + 2 NaI PbI 2 + 2 NaNO 3 Acid/Base Lewis: bond formation (but no change in oxidation state) o Ex. CO 2 + H 2 O H 2 CO 3 Bronsted: hydrogen ion transfer; conjugate pairs o Ex. H2CO3 + NaOH NaHCO3 + H2O Friday, December 01, 2006 GOALS Distinguish reaction by electon motion Distinguish reaction by chemical equation...
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Chemistry 36 Friday, December 1, 2006 - 2OH 1- +H 2-0.83V...

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