<p>Those questions in which the equations are given and we have to calculate the new molar value. We had 4 or 5 questions like those ones. The rest was fairly standard</p>
<p>Wait why was it -85.
I remember the problem was like
AB (l) -> A (g) + B (g)</p>
<p>and then the two things were like
AB (l) -> AB (g)
AB (g) -> A (g) + B(g)</p>
<p>Didn’t you just add the enthalpies together and get -35 or something?</p>
<p>I got -35 I just added them. It all cancelled out to what u wanted in the end. Sameer is right up there and so is c0nman</p>
<p>What did u guys put for the copper wire one btw? </p>
<p>Right, I got like -45 or something like that. Anyway, add these two number is the correct way</p>
<p>@SameerHussain can you please give a made up example so I can get a feel for it? Sorry if Im asking for too much. So there wasnt much organic chemistry, electrochemistry, or lab procedures/safety?</p>
<p>Copper was the electron answer I think. You can’t really “observe” a transfer of 2 electrons lol</p>
<p>There was a question that asked about copper and sulfur. The product is Copper Sulfide, which I’m assuming is insoluble. Was it C?an insoluble product forms? </p>
<p>And was the answer to one of the mole question something like 0.5 mol O2 and 1 mol CO or CO2 i can’t remember </p>
<p>can someone make a google document and compile all the answers please?</p>
<p>I’ll do it but i don’t know to to upload it because I’m new to this thing</p>
<p>how to upload*</p>
<p>how to upload*</p>
<p>Answer should have been Copper loses 2 electrons, because Cu2S forms, not CuS. I got it wrong :/</p>
<p>How do you guys think the scale of this is going to be?</p>
<p>Also, does anyone remember the answers to those questions you had to match to chemical reactions? Like is a redox reaction, is acid base neutralization with no visible change, forms gas, forms complex ion. Not sure if there was one more question relating to those. I think I messed up all of those (besides redox) and am very worried.</p>
<p>The neutralization one was HCl with NaOH. The one that releases gas was reacting calcium carbonate with an acid. It was B i think. The oxidation reduction one mentioned copper or zinc I’m not sure</p>
<p>Oh and how can Cu2S form. i thought copper had a +2 oxidation state and sulfur had -2 so they cancel and it becomes copper (I) sulfide. Does Cu2S ever even form? can anyone explain? @dianazhao</p>
<p>Copper has +1 or +2</p>
<p>I looked up the experiment and apparently it generally loses one instead of 2</p>
<p>Damn. That’s one gone with the density question. I didn’t even pay attention to the significant figures :/</p>