<p>@echoyjeff222 - Thanks! I completely forgot about the Ecell value.</p>
<p>Are there any other differences between galvanic cells and electrolytic cells? I remember vaguely something about cathodes and anodes but I can’t remember what it specifically is.</p>
<ol>
<li><p>Cu+2 is light blue, as you probably know. NH3 combines with the Cu+2 to form a complex ion, [Cu(NH3)4]2+, which is dark blue.
Here’s a video of the reaction:
[YouTube</a> - copper ions with ammonia solution](<a href=“- YouTube”>- YouTube)</p></li>
<li><p>BaCl2 + H2SO4 -> 2HCl + BaSO4
Remember that BaSO4 is insoluble.
You have .01 mol Ba+2, and .005 mol H2SO4. Sulfuric acid is the limiting reagent, so .005 mol Ba+2 remains after the reaction.
You have .200 L total.
(.005 mol)/(.200 L) = .025 M.</p></li>
<li><p>C6H14 and C8H18 are both long hydrocarbons that are nonpolar; because they are so similar, they combine to make an ideal solution.</p></li>
</ol>
<p>coffeeandtea you still at it too… lol?
Where are the answers to the 1999 test btw?</p>
<ol>
<li><p>Barium Sulfate isn’t soluble would be my guess…
Idk you you’d eliminate .012. </p></li>
<li><p>The one with the least attractions would be most ideal.
So two n-hydrocarbons would do the trick.</p></li>
</ol>
<p>SuperCuber: Yep, I still am. I used google to find answers and I downloaded some word document with them and then closed the page. They should be pretty easy to find on google, or I could just give you the answer to a question if you ask me.</p>
<p>Thanks you guys for the help. I kind of assumed when I got 69 wrong it was because of barium sulfate (and I kind of thought about that when I saw the problem but I gave up on doing it).</p>
<p>Edit: Wait, here are the answers. <a href=“Redirect Notice”>Redirect Notice;
<p>Thanks for the last practice test + answers.
I think I’ll go review electrochem a bit more and then the color + solubility rules… and off to bed.
Good luck tomorrow, though I’m sure you won’t need it!</p>
<p>Help?
In the electroplating of nickel, 0.200 faraday of electrical charge is passed through a solution of NiSO4. What mass of nickel is deposited?</p>
<p>Ni (2+) + 2e- = Ni (s)
So then it’s just .2 F * .5 moles/moles electron * mm Ni = 5.87g</p>
<p>Good luck to you as well! I’m just going to look over color and solubility rules too, along with a tiny bit of thermo. Then it’s time to get some rest!</p>
<p>Hey guys i think someone answered this already but when is the R=8.314 used and 0.0821used ?</p>
<p>good luck to all!
i am going to sleep for now and i will wake up within an hour to end my lon-short road of stud-cramming.</p>
<p>Aaaannndddd finally to bed.
I look forward to hearing from all of you tomorrow :D</p>
<p>solid potassium oxide is added to water.</p>
<p>K20 + H20 -> 2 K+ + 2 OH-… why does it ionize, why aren’t the products just KOH</p>
<p>Guys!! What’d you think of the free response questions??</p>
<p>Good night supercube. I’m pretty sure you’ll get that 5, reading all your super posts :)</p>
<p>Its still 11 30pm here. SOOOO I guess an additional hour or so will help…maybe. GAHH I’m so nervous. I really need that 5 and I’ve only scraped a 5 in the 2008 test. The rests are 4s. -.- (i heard the 2008 test is pretty easy too)</p>
<p>damm I still don’t get stoich.
and ksp.</p>
<p>who’s still shoving stuff into their brains??</p>
<p>@isk82live, its a strong base thats soluble (its like HCl breaking into H+ and Cl-). In the net ionic equations for the reactions part they want all the strong acids and bases expressed as ions</p>
<p>@rissy. Some I’m really prepared for. ie. rate of reaction. OTHERS DAMN I AM GNA FAIL. I really need a high MC score to balance out my low FRQ. I got a 0/9 once.</p>
<p>oh okay thanks… how about sodium hydroxide and acetic acid…</p>
<p>HC2H2O2 + OH- -> C2H3O2- + H20… that’s the answer</p>
<p>aren’t acetates soluble??? why doesn’t acetic acid break into ions?? thanks…</p>
<p>They are soluble. the acetate itself doesn’t break apart but salts with acetate as an ion will dissociate. The acetate itself doesn’t crack.</p>
<p>The acetic acid broke into h+ and acetate-</p>
<p>Who’s awake . . . ?
In an electrochemical cell, the cathode is negative and in a galvanic it’s positive.
What does this mean?
Is reduction still at both of the cathodes?</p>
<p>I just woke up to cram some more.</p>
<p>Wait, why is it negative in the electrochemical cell? I thought it was always positive…</p>
<p>Rissyy, did u guys take the exam already? Don’t give out answers because I have yet to take it on the east coast…</p>