<p>like a e a</p>
<p>I got that</p>
<p>there was a question about which of the following if added would reduce the concentration of (cuso4 i think?) sorry for being so vague trying to remember it anyone know wat im talking about and wat they put?</p>
<p>@football1 I believe that one was like… Na2SO4 or something? Common ion effect.</p>
<p>wiat for 68 the gas volume problem was 22.4 liters, no? what was the question again??</p>
<p>What was the correct answer for the molarity of a solution? The answers were like .002 .025 etc. and what was the choice letter?</p>
<p>I’m pretty sure 68 is 44.8 Caz the pressure is 0.5 which is not stp.</p>
<p>i got 11.2 for that… 22.4 L at 1 atm would be x liters at .5 atm. Set up a proportion to get 11.2. what would a raw score of 78/85 be?</p>
<p>2 mol gas at STP: 44.8 L
2 mol gas at 0.5 atm + 0 degrees Celsius: 89.6 L (half pressure is twice volume)</p>
<p>It’s really that simple.</p>
<p>I also remembered another: 18 * 10^23 molecules of N2.</p>
<p>may be 760-800 depends on curve. :] pv is inversely relationship, so biiger the pressure is, the small volume is. is there any body remember any ttce question?</p>
<p>@studious yes that is 18 something.</p>
<p>is there a question about xh？ is that xh5 right？</p>
<p>xh3. it has 5 valence electrons (like nitrogen) so it would have a -3 charge, not a +5 charge. so it’s XH3. what were the other choices for the 89.6 one? i cant remember what i put lol</p>
<p>MY LEG ITCHES UGH I JUST WANT TO GO TO THE MELTING POT ALREADY</p>
<p>After getting a 55/60 on the chem olympiad, missing that problem about the volume at 2 mol and .5 atm just makes me feel so dumb. Should have checked my answers in the 15 minutes i had left 
.</p>
<p>that one is strange cuz usually h should be on the left if it is positive charge. When h on the left it should be negative charge like ch4. And n also could have 5 positive charge like no3-</p>
<p>Im heaitate that one long time. Luck that I still finish the test:)</p>
<p>what is answer for KMT?</p>
<p>May i have everyone’s attension plz, i have found a common mistake.
Actually Ag 107 is heavier than Pb106, no kidding.
so one of the TFCE question should be TF.
can someone confirm my point?</p>
<p>the first statement said :
Pb2+ needs more electron than Ag + , which is true
the second said:
Pb is heavier than Ag, which is NOT true according to the periodic table
so the answer should be TF?</p>
<p>The molecular weight of Pb is 207. I think you might have confused it with Pd, which is 106.</p>