<p>well on the wiki for buret they mention it is used for precise measurements, never learned it though</p>
<p>ShadowRider, if you’re there, you said something about dispension right?</p>
<p>no… wait i thought it was graduated cylinder… :(</p>
<p>from wiki: "“graduated cylinder is a piece of laboratory glassware used to accurately measure out volumes of chemicals for use in reactions. They are generally more accurate and precise for this purpose than beakers or flasks…”</p>
<p>no mention of burets though.</p>
<p>I wasn’t sure about the buret/graduated cylinder thing either.</p>
<p>Our 50 mL burets only have had 3 sig figs.
So would a 50mL graduated cylinder.</p>
<p>But I don’t know if that even matters.</p>
<p>I said graduated cylinders because we only used burets for titrations and never just for measuring things…</p>
<p>That’s what I thought too. </p>
<p>Thoughts?</p>
<p>i said graduated cylinder also …
i thought burets are only used for titration</p>
<p>that’s what I put too (grad cylinder), dunno if it’s right.</p>
<p>ah i’m getting sick from hearing the ones i got wrong, i better go.</p>
<p>thanks everyone!</p>
<p>i know wikipedia is not always 100% accurate, but they usually aren’t that far off the mark. look up buret, i think what they say is pretty accurate. Our burets are precise to the +/- .05</p>
<p>On Question #4, though, I believe it though…when it asked which was reaction was an example of polymerization…what WAS the last choice (E) actually an example of? It was like, N-(CH2) -> (CH2)N, or something…you know?</p>
<p>I KNEW it should have been choice (C) - the carboxylic acid + the alcohol, I think it was - only I changed my answer to (E) at the last moment. The little CH2 just looked so tiny, so helpless…like it was screaming, “Look at me, I’m a monomer! Watch me turn into a polymer!” :D.</p>
<p>I don’t know if there even WAS a reaction in choice (E) though, since there was no + sign. Does anyone happen to know what it that…<em>occurrence</em>…WAS called though? Just wondering!</p>
<p>Any more thoughts about Buret vs. graduated cylinder?</p>
<p>.05 or .5?? Because a 50mL buret to the .05 would have to be ridiculously thin…and they asked about a 50mL buret.</p>
<p>StarportDX, I am still here.
If the question was asking about the dispensation of a liquid, buret would be the correct choice, if not then you pick the instrument that you know is the most precise.</p>
<p>Does anyone know why they put so many balancing equations questions in? It’s a really basic concept and being able to do it once or twice should prove your capabilities. I don’t know. I felt it was a waste of time (well, they took me longer than most of the others).</p>
<p>Billy__Liar, the balancing equations were really boring, but then you could still think of them as freebies. :)</p>
<p>i dont know i found that very obnoxious to billy_liar.</p>
<p>hmm with our 50 ml buret its readings are to the .1, and the last sig figure is estimated. so +/- .05…</p>
<p>shadowrider, what is a dispensation? thats probably an embarassing question but oh well.</p>
<p>Blahhhh. It seemed like a lot of the questions required a lot of mental math.</p>
<p>The one with Cadmium, oxygen, and hydrogen. Anyone remmeber what they had?? I remember my subscripts were 1, 2, and 1. But I can’t remember which was which…</p>
<p>Clicheusername57, dispensation is the act of pouring something out.
For example, burets dispense liquid, while graduated cylinders do not.</p>
<p>cliche, yeah the last number is estimated so doesn’t count for sig figs…so there are only 3. Like, 34.3. Oh well. I always tell myself I won’t think about tests and things once they’re done. So much for that…</p>
<p>About the polymerization reaction, I am pretty sure the answer is E (which was n-C2H4 ==> (C2H4)n. Choice C was two hydrocarbons mixing to form a bigger one, but if you looked closely, it was an acid-base reaction of an organic acid (ethanoic I think) and an organic base. E makes sense for polymerization - n C2H4 monomers becoming a polymer.</p>
<p>edit: look at <a href=“http://upload.wikimedia.org/wikipedia/en/2/27/Ethene_polymerization.png[/url]”>http://upload.wikimedia.org/wikipedia/en/2/27/Ethene_polymerization.png</a> which shows the “n” thing as polymerization.</p>
![http://upload.wikimedia.org/wikipedia/en/2/27/Ethene_polymerization.png[/url]](http://upload.wikimedia.org/wikipedia/en/2/27/Ethene_polymerization.png%5B/url%5D){kind=link}
<p>OMG…seriously?! Wow…I LOVE YOU rb9109!! </p>
<p>Ok…sorry for my enthusiasm. I was just kinda killing myself over what I thought was a bit of stupidity (I sometimes do that >.O, you know?). YAAAY…hahaha.</p>