<p>I don't recall the question, but greater average speed --> greater average KE --> greater temperature, right? So, by PV/T = k, we know that volume would decrease and pressure would increase...</p>
<p>I hope so...</p>
<p>The real SAT II book said 85-78 is an 800, I hope so....I thought that this one was easier so the curve will probably be 85-80 (arrgh!).</p>
<p>I put TTCE for that one, because I thought the statement and the explanation made sense.</p>
<p>it's T/F. A pressure change will not result in a temperature rise.
you say PV/T = k
This is true. When v decreases, p increases. temperature is not affected.</p>
<p>I guess that makes sense. I am still trying to remember the question though. What was the explanation (second part of the question) already?</p>
<p>because the molecules have a greater average speed.</p>
<p>Ohh, this question. Do you guys remember if the part about changing pressure affecting temperature said anything about keeping volume constant? I remember putting 'F' for this part, but if volume was constant then would temperature be affected for PV/T to hold?</p>
<p>pressure and temperature are directly porportional when everything else is constant i think..</p>
<p>what was the london dispersion/ nitrogen question?</p>
<p>For the brittle conductor one, I said metallic because metals would be the best conductors, and they can be brittle. When I just looked this up in my AP Barons book, the main thing said about metallic substances is that they are conductors, and adds that they can be brittle, while the ionic part following it mentions that they are brittle but doesn't even mention their ability as conductors. I don't remember the question that clearly- why does everyone seem to agree that it's ionic?</p>
<p>I put covalent metallic network solid or something like that, but i think i got that wrong.</p>
<p>It said when you put it into water, it becomes a good conductor. So I just assumed that it would be an ionic solid?</p>
<p>i dunno, my chem teacher said that ionic bonds were very rarely brittle; he said molecular (covalent) bonds are the brittle ones.</p>
<p>I don't think compounds other than ionic will be able to conduct electricity in water though. =\
For example, let's take SiO2, quartz, a network covalent compound. When you put it into water, it isn't able to conduct eletricity.</p>
<p>yeah i know, i was debating for like 2 minutes about ionic or molecular.... i prolly got it wrong, is the "electron sea" model for ionic or molecular?</p>
<p>electron sea is usually being used to describe metallic solid</p>
<p>im confuzzled :-(</p>
<p>There's one thing I'm sure of--the question did not say in sol'n or in water.</p>
<p>it said "a white brittle substance that when dissolved in water is a good electrical conductor" That perfectly describes any of the alkali-halogen salts, which are ionic bonds</p>
<ol>
<li>Brittle, could conduct electricity when melted (ionic bond)</li>
</ol>
<p>It didn't say solution or in water, but the molten states of ionic compounds will conduct electricity. On the other hand, the conductivity of metals such as copper decreases as temperature increases, since the resistivity of such metals will increase with temperature.</p>