<p>I think CH4 is a gas (methane) and CCl4 is a liquid! The question asked liquid I believe!</p>
<p>Do you guys remember the question that said which lab tool is least likely to be used in an experiment using an acid? One of my friends said they put crucible. I think that’s prob the right answer, I left it blank.</p>
<p>For the nonpolar covalent bond it’s CCl4 I believe.</p>
<p>For the Fe turning into Iron oxide question did you guys put it’s being oxidized? I think that was the answer.</p>
<p>Also what about the 0.01M of Acetic acid? What was its pH? I think I put 5.</p>
<p>Also there was a question like which of the follow is NOT being oxidezed/reduced. I put alcohol boiling or something like that.</p>
<p>hm…I don’t remember a problem mentioning CCl4.</p>
<p>crucibles aren’t used in titration experiments, they’re used to heat substances over a flame.</p>
<p>yep, Fe(0) + O2(0) –> Fe2(+6)O3(-6), parentheses are oxidation numbers. iron is gaining a positive charge so it’s being oxidized.</p>
<p>pH of acetic acid? I don’t remember that question…did they provide the Ka or something?</p>
<p>I don’t think that (alcohol boiling) was one of the choices, was it? I think I put the precipitate reaction…</p>
<p>i think you were supposed to find Ka for acetic acid using the fact that there were 10^-3 moles of H+ dissociated in a 0.01M acetic acid solution? so i think what i did was:</p>
<p>Ka = [H+][CH3COO-]/[CH3COOH] = (10^-3)(10^-3)/(0.01 - 10^-3) = (10^-6)/(0.009) ~ (10^-6)/(0.010) = (10^-6)/(10^-2) = 10^-4</p>
<p>… but i think i put 10^-5 as my answer, maybe it was 0.1M not 0.01M acetic acid? i can’t remember</p>
<p>^precipitate reaction would go from liquid to solid which is an entropy decrease i think o.o</p>
<p>the reaction that wasn’t a redox reaction was the double replacement reaction (i just remember it as being the last choice in that set, E)</p>
<p>i dont think 4 was a choice but i could be wrong</p>
<p>oh and i think the question asking about the pH of an acidic solution was about HNO3 or something like that and they told you there were 10^-2 moles of NO3 so therefore there were 10^-2 moles of H+ and the pH was 2.</p>
<p>@fleurs12: yeah i’m pretty sure i put 10^-5 so i think the acetic acid was 0.1M… would need someone to verify that though</p>
<p>in other news, i am so glad i took chem instead of math ii</p>
<p>i put 2 but that was somewhat a guess 
nooo you shouldve taken math 2
so much easier/better curve.</p>
<p>i guess but even with the curve i always make stupid mistakes… with chem it’s a little harder to make those kinds of mistakes
also i actually like chem, lol</p>
<p>oh haha i’m really bad at chem xP
plus i feel like i made stupid mistakes on this D: misreading</p>
<p>yeah I remember that molarity was 0.1, not 0.01. so it was 10^-5</p>
<p>and I put the precipitate reaction for the non-redox reaction, since it was double displacement</p>
<p>I think the test was more straightforward than most of the practice tests I took.</p>
<p>credits, I’m pretty sure it was 0.10M so your answer was right.</p>
<p>For the most increase in entropy I thought it did not specify chemical change, though it did in the two subsequent questions so I put alcohol boiling but I may have forgot. Also for the
tonic and covalent bond containing molecule I think you guys mean NH4Br, because that is what I remember putting.</p>
<p>@jelly-
oh i see i put that too</p>
<p>Does anybody remember any of the last few questons on the test?</p>
<p>I know for the last one u had to multiply 18 by something…to get one mole of water something!</p>
<p>Yeah it was like 13kJ/g x 18g/mol is approximately 230 kJ/mol given off as heat for the reaction.</p>
<p>for the one with the separating iron fillings and sand with potassium something? I put extraction with water.</p>