<p>what'd y'all think?</p>
<p>i got owned hard. on the plus side, no more lavelle ever again YAY!!!</p>
<p>^ </p>
<p>+1. :)</p>
<p>the first question and especiall second question was impossble</p>
<p>the 2nd one and the ion selective electrode one got me =/</p>
<p>I didn’t think it was THAT hard, but there were definitely some questions that were difficult, like the entropy question.</p>
<p>I’m glad I remembered to do the extra credit that he mentioned in his office hours. Those 5 extra points are really going to help my grade.</p>
<p>extra credit?</p>
<p>What did you guys get on the first and second questions anyway?</p>
<p>well, for the second problem on entropy, i wasn’t too sure, but this is how i did it. i calculated entropy of system by adding the entropy change due to change in temperature (he gave these to us) and then adding the entropy change due to fusion of the ice. then for entropy of surroundings i used -q/T, where q is the heat released from the melting ice. then i totaled Ssys and Ssurr for Suniv, which was positive and around 50ish J if i remember properly. so it was spontaneous.</p>
<p>i might be completely wrong though haha. but thats what i ended up doing on the test.</p>
<p>^ thats what I did, but it seemed too simple since the question was like 20 points. I just left it alone haha, partial credit ftw.</p>
<p>^i don’t think the points really indicate the difficulty. the 20 point problem is usually the homework problem that he always promises will be on the final/midterm. </p>
<p>for example, the 20 point titration problem on the chem 14a final was the homework problem, although that problem was actually pretty hard lol. and i think it was the same for the midterms, the higher point question was usually the homework question.</p>
<p>i dont think he would make a truly tricky/difficult problem 20 points, or else everyone will be getting a raw score in the B range.</p>
<p>^^^ well i thought that since the ice+room is part of the SYSTEM and the surroundings is everything OUTSIDE the room, that Ssurr would be 0 since melting an ice cube in a room won’t increase the entropy outside the room? Not sure whether common sense can apply here or if your answers have the be chemistry-based…</p>
<p>update: I hear that a TA told someone that the room was thermally insulated.</p>