<p>um i think at most, 1 or 2 eq/rate problems. Shouldnt hurt you tho.</p>
<p>** ACIDS, BASES, AND SALTS**</p>
<p>QUestion: Do we have to know different indicators and their ranges, and what colors they are associated with?</p>
<p>Jumpngo: I’ve never seen a question about that on a practice test, and it’s not mentioned in PR, so probably not.</p>
<p>lol thats too specific. I think they might sneak in 1 or 2 questions like that in there. But just worry about important concepts mainly. If the stuff ^ u mention doesnt take too long to memorize, then go for it, but i wouldnt spend too much time on it. I am about to take the 2nd practice test in a min. I just finished flashcards from the first. Turns out i only have like 20 lol</p>
<p>jumpngo, just know that an indicator changes color approximately at its pKa</p>
<p>k.</p>
<p>Out of these choices (Ca, Au, H, Fe, Cu) Why is Ca the best reducing agent?</p>
<p>Listed in order of decreasing reactivity: (Ca, Na, Mg, Zn, Fe, H, Cu, Hg, Ag, Au)</p>
<p>Aha. I recognize this question 
This is from Sparknotes, no?</p>
<p>Ca is the best reducing agent, aka most easily oxidized, because it is the most reactive (and therefore loses it’s electrons more easily)</p>
<p>No this was from Barrons… ANyways, thanks. I finally KINDA figured out a way to remember “reducing agent, and oxidizing agent.” its so ■■■■■■■■ how they named it like that… ANYWAYS. </p>
<p>Is this type of question that is going to be on the real subject test</p>
<p>A reducing agent used in the blast furnace is… (CaCO3, CO, O2, SiO2)</p>
<p>lolcats what are some things that one MUST need to know
I saw on your other post, solubility rules are very important (even the exception ones?)</p>
<p>the exceptions show up too. Go on [url=<a href=“http://www.chemmybear.com%5Dchemmybear.com%5B/url”>http://www.chemmybear.com]chemmybear.com[/url</a>] they have a cram sheet for the AP exam (but it has tons of good stuff like organic chem easy memorization, easy solubility rules memorization, flame test colors, etc on 1 cram sheet (actually its 2 pages but its still VERY good), i just printed the sheet out on my AP day and kept on going over the stuff while i waited for the test to start.</p>
<p>thanks</p>
<p>How much of the test is on Organic Chemistry and Nucleonics?</p>
<p>And can someone list the most important things I need to know for both?</p>
<p>Organics is pretty basic; know the basic structures and nomenclature, as well as how to write a combustion reaction.</p>
<p>thanks. CDN</p>
<p>Several questions:</p>
<p>1) Find pH
Given: 0.005 M solution of H2SO4;
Answer: 2 x 0.005 = 0.010 = 1x10^-2 ; pH = 2</p>
<h2>do I just look at how many Hydrogens there are, and just multiply M by the # of Hydrogens?</h2>
<p>2) Acetylene (C2H2)
why is there a TRIPLE bond between the Carbons, instead of a DOUBLE bond? I thought -ene from (alkene) meant double bonds?</p>
<p>3) Are these type of questions on the test?
“Predicting freezing point of soln that has 684g of sugar (1 mol = 342) dissolved in 2,000g of H20”
Answer: -1.86 C</p>
<ol>
<li><p>Yes, since sulfuric acid is strong and completely dissociates, even with 2 H’s.</p></li>
<li><p>Because if you have a double bond, there won’t be a stable octet, since each carbon only will have 6 electrons. Yes, acetylene is a commercial name… The OFFICIAL name is ETHyne. -ynes have triple bonds. It’s only -ene when you have meth, eth, but, prop, and those other official prefixes before it. </p></li>
<li><p>I don’t know, but that question really isn’t that difficult.</p></li>
</ol>
<p>HOw would one figure out #3 and other problems like that?</p>
<p>For #3, I think it’s a matter of figuring out the number of moles of solute and then memorizing that for every mole of solute added, the boiling temp decreases by X amount. Pretty sure there was an explanation of some sort in the Barron’s book (I’d check, but I’ve given my book to a friend)</p>
<p>Yeah, thanks. So heres an update of all 4 practice Tests in the Barron’s book
(I made freaking flash cards for problems I missed/ starred, which were like a crapload)
*** correct/missed—score ***</p>
<p>Test 1: 39/34—560-540
Test 2: 46/26—620-590
Test 3: 42/28—590-560
Test 4: 61/15—720-700 <----- MUAHHAHAHA.
I just want to get in the 700s on the real deal. Initially, I was just yearning for 600s. But human nature, like always, is greedy.</p>
<p>No, as you add more solute, boiling pt increases. Freezing pt decreases. </p>
<p>For this equation you need to remember :
Freezing depression = i x (molality) x (Kf)
the molality of the solution will be 1, and i = 1, since sugar isn’t gonna dissociate. Kf is a constant which ALWAYS is 1.86. So your answer will be 1.86. However, b/c this is a freezing pt question, 1.86 means means the freezing pt will go DOWN 1.86. Therefore, answer is -1.86 C.</p>
<p>Edit: For question 1, ONLY sulfuric acid would do that since it’s a strong acid. If you have a weak acid with 2 H’s it wouldn’t be that way.</p>
<p>mhm. Thank you equilibrium.</p>
<p>Is that on the test? the k’off equation I believe</p>
<p>i x (molality) x (kf = 1.86)</p>
<p>What is the oxidiation # of N in… NH3</p>
<p>The book says it is +3?</p>
<p>I thought H = +1; 3 x +1 = +3</p>
<p>Needs to be = to 0, therefore N = -3?</p>
<p>Also, another question:</p>
<p>To determine the difference between oxid. and reduction equation when given the E (volts)… you look at the MOST NEGATIVE one right?</p>
<p>the most negative one will be the OXIDATION equation correct?</p>