<p>my question wasn’t answered. I was just wondering</p>
<p>to the poster above me just play around with them on your calculator and try to estimate by figuring out wether 7.0 E -9 is closer to 1E-8 or 1E-9. Then pick a number relatively close to that. They know that you don’t have a calculator built inside of your brain. Can we just list random proper lab procedures that you guys know? I always miss those on MC</p>
<p>Well in school we’ve had 3 weeks of review. and I’ve done hardcore studying in the past week outside of that.</p>
<p>sig figs can be one off but why be one off? just check all the time… make it a habit by tommorow.</p>
<p>hummm sounds awesome.</p>
<p>If you get one sigfig off, you get one point off from every single FRQ you get wrong.</p>
<p>And someone please answer this:</p>
<p>"Covalent bonds.</p>
<p>I need to know the idfference between intermolecular covalent bonds and intramolecular. "</p>
<p>@aberc, some people are in PST time zone, it’s only 8 here…</p>
<p>intramolecular: London Forces (e- clouds around atoms that normally wouldn’t force each other, ie diatomics) < Dipole dipole < hydrogen bonding (type of dipole dipole, but only occurs between H and O N F? )</p>
<p>Intermolecular:
Ionic (giving e- and gaining e-) and Covalent bonds (Sharing of e-)</p>
<p>Sig figs can be one off in either direction without penalty.</p>
<p>I don’t believe Serafina is correct…</p>
<p>Im screwed because the rest of the kids in my class are seniors so senioritis kicked in to the point they just don’t give a fu**. So my review has been pitiful with no after school study sessions like I would’ve imagined.</p>
<p>Can somebody explain to me what a buffer solution consists of?</p>
<p>I think its a combination of strong acid + strong base or weak acid + weak base</p>
<p>But what about conjugate acids and bases?</p>
<p>My teacher has said most of the time sigfigs are in the 2-4 range, never really more than that. So keeping a sigfig count of 3 will ensure no points taken off for most of the FRQ</p>
<p>A buffer I believe is an acid and that acid’s salt. and maybe vice versa</p>
<p>Weak acid plus the conjugate salt.</p>
<p>ok electron affinity vs. nuclear charge vs. effective nuclear charge? wat??</p>
<p>TerrenceC:</p>
<p>Aah, you’re right. It has to be at least 2 sigfigs off either way to get a point off. Darn Collegeboard and their cryptic wording, even for instructions. My bad. 1 off either way is fine, but anymore deserves a point penalty.</p>
<p>so basically having three sig figs for every answer would not lose pts…i know the rules but just wondering worst comes worst scenario…</p>
<p>GOOD LUCK, GUYS.</p>
<p>We got through a year of AP Chem. This is the easy part.</p>
<p>how do you find the reaction order by only looking at a table or graph of concentration vs time?</p>
<p>I just did a study session with my friend who lives across the country using xbox live and I learned that if you don’t know the answer, guess whichever one has bromine in it</p>
<p>You’d have to compare two experiments in which one reactant’s concentration stayed the same and the other’s changed. Then do the same for the other reactant.</p>
<p>As for the graph, a first order reaction will produce a straight line when ln [A]t is plotted versus time.</p>
<p>A second order will produce a straight line when 1/[A]t is plotted versus time.</p>