Galvanic Cells

Test Preparation
1

<p>Sorry for posting again and again but ahh... well </p>

<p>maybe i should make one fat AP Study questions thread anyways....</p>

<p>here we goo...</p>

<p>If one side is Ag (silver) and the other Zn (zinc ) how do you tell which is the anode and which is the cathode... ? it doesn't say in the book they both form positive ions so ... ?
sorry i have no clue i'm trying to teach myself :)</p>

2

<p>ok so basically you have to see which one has a more positive standard reduction potential. Whichever metal that is is the one that will most likely be reduced, meaning that it will be the cathode.
So in this case, silver has a reduction potential of +.80 and zinc has a reduction potential of -.74 so you know that silver will be reduced and will therefore be the cathode.</p>

<p>hope that helps :)</p>

3

<p>You're teaching yourself? Poor baby, my AIM is obieluvshersax, ask me all you want, it'll help me study too. We just learned these last week! </p>

<p>Galvanic cells = batteries, they run on their own, make energy. To figure out which way it runs, you need a chart of or given reduction potentials (E-naughts). It's given for the FRQs. You use the Es along with the equation in a kind of Hess's Law style set up, except do NOT multiply the E-naughts by the coefficients (take the opposite of the E for reversing it). This gives you the volts of the thing. To make a Galvanic cell, you must arrange the reduction half-rxns and add the Es in a way that gives you have a POSITIVE voltage. Once you have a positive voltage, you apply the FAT CAT Law to the direction the electrons are flowing, (From Anode To CAThode) and you get your answer.</p>

4

<p>I use "anox redcat"</p>

<p>or caThode T = +, so it's reduced from a positive charge</p>

5

<p>Well, we also have LEO the lion says GER (lose electrons oxidize, gain electrons reduce). lol, this should be its own thread.</p>

6

<p>OIL RIG is good too.<br>
OxidationIsLoss ReductionIsGain</p>

7

<p>Ooh mashimaroban, that's good! Reminds me of a game of pictionary I once played, a few days ago...</p>

8

<p>thanks guys !</p>

9

<p>haha we learned LEO the lion goes GER
LEO - Loses Electrons Oxidation
GER - Gains Electrons Reduction</p>