<p>At whoever was asking about the complex, the reaction makes xxxxxxx</p>
<p>Don’t post the answers. You can only give a general discussion that doesn’t directly relate with the answers/questions until 48 hours</p>
<p>I may, or may not, have gotten 62.5 mass percent.</p>
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<p>The cobalt one. Coordination complex? Post #120 has the right answer.</p>
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<p>F–k; some of my friends weren’t getting stuff like in the 60 range. Umm, was the moles about .005?</p>
<p>i think chaosdog is right for the Ag problem</p>
<p>If only Osama Bin Laden didn’t die the night before our exam =/</p>
<p>Post 122 has the right answer.</p>
<p>checking the memory on my calculator, i second chaos</p>
<p>Hmm, then the number of moles I got was probably wrong.</p>
<p>Anyone know anything about potentials for galvanic/electrochem cells?</p>
<p>Was definitely in the 60 range.</p>
<p>Side note, lol @ sqrt 2 and -1 as answer choices on the rate order question.</p>
<p>To find potential you just add the standard reduction potential of each half reaction (except you change the sign of the reaction you decide is oxidation; in a galvanic cell, this will always be the LOWER number, though it can be either in electrolytic cells).</p>
<p>Am I the only one who thought the test was decent?</p>
<p>I think I got a 5, but I don’t want to say that in case I get a 4.</p>
<p>No, you are not the only one.</p>
<p>^^^Damn. I remember reading on CC that electrochemical cell means negative cell potential, so that really screwed me up today. At least I’ll get points for (e) even though I flipped the equation on (d).</p>
<p>^^Nah, I thought the test was decent. There were just a few (well, a bit more than a few) whatthefu-k moments.</p>
<p>i thought it was hard :(</p>
<p>electrolytic means negative (nonspontaneous)</p>
<p>and @ pancaked do you mean that if we had to choose between</p>
<p>two reductions:
-.8
+.7</p>
<p>we would switch the first one to oxidation (into +.8) to get a more positive number, right?</p>
<p>No, electrochemical cells can be either spontaneous(voltaic) or nonspantaneous(electrolytic). In that case, based on the reaction and the Ered values, I’m pretty sure it was a positive value.</p>
<p>i flipped the first one i think. you wanted the hydrogen on the left side (i think), so i flipped it so the hydrogen was on left side and it made a really nice equation that made water, I believe.</p>
<p>anyone else get that?</p>
<p>Yumi- first is oxidation? second reduction? Ecell= ered cathode- ered anode= .7- (-.8)= 1.5</p>
<p>what were the reactants for the complex ion?</p>
<p>[deleted10char]</p>
<p>I think you’re confusing the term electrolytic and electrochemical. Electrochemical is a broad term. Galvanic cells ARE electrochemical cells. They create current and thus have positive potentials. </p>
<p>Electrolytic cells are NOT galvanic cells. They have negative potentials and require electricity in order for reactions to happen.</p>