<p>Hi, can someone please take a look at this 1994 Chemistry Test and tell me if it is an accurate representation of what to expect?</p>
<p>Thanks</p>
<p>Sorry, I forgot to attach the link LOL</p>
<p><a href=“https://docs.google.com/viewer?a=v&pid=sites&srcid=aGJhLm5ldHxtaHV8Z3g6Mjc3YTcxYzlkM2I5MDliNw”>https://docs.google.com/viewer?a=v&pid=sites&srcid=aGJhLm5ldHxtaHV8Z3g6Mjc3YTcxYzlkM2I5MDliNw</a></p>
<p>If someone could please explain #5-9 to me I would GREATLY appreciate it</p>
<p>It’s a series of reactions. NOTE: the coefficients are unbalanced - this is key.</p>
<p>In 5 (Cr2O7(2–)):
OH(–) + Cr2O7(2–) --> 2CrO4(2–) + H(+)
(it can’t be the Chromate(III) ion because the charges need to balance)</p>
<p>Reaction with 6 (Ba(2+)):
2CrO4(2–) + 2Ba(2+) --> 2BaCrO4</p>
<p>Equilibrium with 7/8 (H(+) / OH(–))
7. 2BaCrO4 + 2H(+) --> 2Ba(2+) + Cr2O7(2–) + H2O
8. 2BaCrO4 + 2H(+) + 2OH(–) <-- 2Ba(2+) + Cr2O7(2–) + H2O + 2OH(–)
2BaCrO4 + H2O <-- 2Ba(2+) + Cr2O7(2–) + 2OH(–)</p>
<p>Reaction to form 9:
2Ba(2+) + Cr2O7(2–) + 2OH(–) + 2SO2 + 8H(+) --> 2BaSO4 + 2Cr(3+) + 4H2O</p>
<p>Ahh, I see. I should’ve noticed that the equations were unbalanced. That would’ve helped LOL Thanks a bunch dude. </p>
<p>Can you help with #31? How do we know that it is a white solid? Is that something I just have to know( I get tripped up on a lot of those descriptive chem questions)</p>
<p>Also, on #20-22, what is your process of thinking? What key words and stuff should I look for?</p>
<p>Finally, I don’t get why #41 isnt E? (795 = 760 + 35, right?)</p>
<p>Hope someone can help me out with these. Thanks in advance!!!</p>
<p>Hello, I just took this test and was also wondering if it was an accurate representation.</p>
<p>For #31, I believe that you do just need to know the physical properties of solids like KCl.</p>
<p>For #20: In water, Hydrogen and Oxygen are ions, but in their respective gases, they have no charge. This change in charge means that both oxidation and reduction took place. </p>
<h1>21: Silver Chloride precipitate because it is “insoluble” in water.</h1>
<h1>22: FeS forms. Originally, both Fe and S are in their ground states, but in the ionic compound they are charged, so a redox reaction must have taken place.</h1>
<h1>41: The reason you don’t add the 35 to the 760 is you’re just trying to find the vapor pressure of the isopropanol, but could you explain to me how you got the 35? I don’t understand that part.</h1>
<p>Hope this helped</p>
<p>Thanks for the help on the first 4. And yeah, looking back at the question, I can’t really figure it out either. Also, I’ having trouble remembering those physical properties/facts about elements. Is there any way I can get better at that or is it just having a lot of experience with chem and stuff</p>
<p>Anyway, whatever, thank a bunch dude</p>
<p>It seems odd to me, cause it would appear the Mercury only moves ~17 mm, no? You could just look up the colors of different metals in solutions, but I’m not sure what else, really. </p>
<p>Can you also explain #59? THANKS</p>
<p>I omitted that one… don’t know for sure, but I think it may have something to do with the fact that Nitrate ions are always soluble in solution? </p>
<p>Have you found any good practice tests aside from this one and the other 20th century released one?</p>
<p>No I havent. I took this one, the 1998 one, and the 4 barrons tests but IDK if those are accurate</p>
<p>Are the Barron’s tests available online, or only with the purchase of the book? And I’ve only heard that Barron’s practice tests are harder than actual, both for SAT Chem and AP Statistics</p>
<p>Nah, I just got mine from the library</p>