<p>Though being a catalyst means that platinum is unaffected by the chemical reaction.</p>
<p>yeah, that’s what I meant.</p>
<p>
</p>
<p>No, “neutralizing” would mean “bring the pH to 7”. You’re forgetting that the product of an acid-base reaction is a salt, so the sodium ions would combine with the sulfate ions to create Na2SO4. The creation of this salt is more spontaneous than the hydrolysis of sulfate.</p>
<p>Actually, “neutralizing” does not necessarily bring the pH to 7. This is the case with buffers. The salt produced can actually be acidic/basic.</p>
<p>No, buffers don’t bring the pH to 7. Buffers keep the pH relatively constant, despite small additions of acid or base to the initial solution. For instance, I’ve worked with a buffer that was created to keep the pH of a solution between 9.5 and 10.</p>
<p>The neutralization of every acid-base reaction will necessarily bring the solution’s pH to 7. However, the hydrolysis of the resulting salts could either lower or raise the pH. This isn’t of concern to you when calculating the molar relationships in a neutralization reaction. The point is to bring the pH to 7, and whether it will be subsequently lowered or raised is not of your concern, at least at the SAT level.</p>
<p>Just as an addendum, </p>
<p>To determine if a salt will form an acidic, basic, or neutral solution</p>
<p>1) Determine what acid and what base reacted to form the salt e.g.
CuSO4 was formed from Cu(OH)2 and H2SO4
2) Determine the strength of the acid and the base
Cu(OH)2 is a weak base, H2SO4 is a strong acid
3) Remember that
Strong acid + strong base = neutral
Strong acid + weak base = acidic
Weak acid + strong base = basic</p>
<p>Here Cu(OH)2 is a weak base and H2SO4 is a strong acid, so CuSO4 will form an acidic solution when added to water (note: hydrolysis = water + salt –> acid + base).</p>
<p>On another note, do you guys have any tips for the funky CE section?</p>
<p>sometimes I get indirect explanations of the first statement, and my prep book seems to randomly select if it wants to bubble CE for it…</p>
<p>I’m not sure if I’m making much sense… basically a lot of times it could go both ways :/</p>
<p>any tips?</p>
<p>oh I have the same problem with the T/F section. Also, I was under the impression that we are supposed to see if the statements are true or false first, as if they are unrelated, and THEN if they are both true see if the second one is the reason why the first statement is true. Is this the correct approach?</p>
<p>For CE, its only (or can only be) CE when its TT right?</p>
<p>^ Well, that’s the way I’ve been going about it, and it makes sense to me. You read the two separately, which makes it easier to determine if each one is true on it own. Then you look at the second and you see if it explains, and then unless it doesn’t explain the main reason or most of the reason, then it’s not CE.</p>
<p>hmm this section sucks…why do they have this JUST for AP chem.</p>
<p>That’s how I’ve always gone about doing the TTCE questions; read first, mark answer, read second, mark answer, then does it make sense? I just took the latest released test and got a 770, mostly from stupid mistakes and not reading the question carefully. I thought it was more difficult then the 1994 released test but it wasn’t too bad.</p>
<p>see the thing is, for some of the Barron’s questions where the answer is TF, the answer explanation says it’s TF because the second statement doesn’t explain the first statement. It doesn’t say it’s because the second statement is false.</p>
<p>^example? page and number?</p>
<p>Yes it can only be CE if the other two are T.</p>
<p>A false statement cannot explain another statement, and a false statement cannot be explained by another statement (at least in the context of this test).</p>
<p>right the section makes sense theoretically, but sometimes I get indirect explanations. For example… maybe…
statement 1: water is polar
BECAUSE
statement 2: water has polar covalent bonding</p>
<p>both are true, and I would say that polar covalent bonding is the main reason why water is polar, so I would mark CE… but from the practice tests I’ve taken, they might say “just because it has polar bonds doesnt mean it is polar” </p>
<p>and while that explanation makes sense… I feel like it could be pushed both ways…=(</p>
<p>dang i just took a practice test (last 60 mins) and I got a 77/85, but I missed all of the descriptive chem questions…how do you study for those?</p>
<p>i got a 740 on the spark notes chem test #2. what do you think my real score would be?</p>
<p>Can anyone explain what a s-s, s-p, and p-p bond is? </p>
<p>Thanks, I posted this under the wrong thing last time seeing this is an official question thread.</p>
<p>Is there a link for the official released test?</p>
<p>^its out of my blue book (it was old test from like 1994 or some year like that)</p>
<p>there are some questions on collegeboards website…but no official 2009 practicr SAT II test.</p>