<p>So is the water level question T,T,CE or F,T? Apparently a page or two back in this thread, someone said it was supposed to be volume not pressure? I put the former though.</p>
<p>Oh and isn't that question about sucrose and water supposed to be 0.6 C --> 1.2 C, because the concentration of solute doubled - refer to collagative properties? Or am I missing something here?</p>
<p>Argh I don't think I got the 800 I was aiming for. It's probably gonna be around 750+ - IMO still very decent, compared with my previous 700 sitting for which I didn't study at all and lost points on 5 silly questions.</p>
<p>Edit: I got 40 seconds too, and either Au or Fe (I think I chose Au though).</p>
<p>Well, the water mass also doubled as well as the sucrose so it should stay the same. Even if you use the formula it should stay the same. </p>
<p>For the answer that was (2.5)(32) was that the question that talked about the volume of O2 at standard atm and then about another gas that was twice as heavy? Or are we talking about different problems</p>
<p>Not sure why it would be 40s though. When you look at the graph, the concentration of X went from like 80 to 40, but the time at which the concentration was half (not to mention the time the graphs intersected) was at 20s so thats what I put</p>
<p>Hipster I think the question was, X liters (don't remember the exact number) of oxygen gas at STP has a mass of 1.6g. What is the molar mass of a gas that is 2.5 times heavier?
That's what I remember, which is why I decided to put 2.5(32 g/mol [molar mass oxygen gas]). From what I understood, most of the information was useless, except for the fact that the unknown gas was 2.5 times heavier than O2. I think it is trying to confuse test takers by making them find the # of moles of oxygen and somehow convert it, but in reality that's not what the question is asking for.
What was everyone elses answer? I hope my logic is correct.</p>
<p>yeah, it definitely had to have been 2.5 x 32. the units work out and everything.</p>
<p>for that one, i put 20s, cuz it didnt ask anything about the products, just when half of the reactants turned into products, regardless of the quantity of products in relation to the initial reactants. and so after 20s, half the reactants were gone.</p>
<p>Argh, seems I misread a few questions. I really thought that 2.5 x 32 g/mol question was asking for volume though, so I put what hipster put. I guess I got tricked. =P Isn't a subject test supposed to be a knowledge test, not a test that makes you read carefully =P.</p>