<p>^ For the CaCO3 question, was CaCO3 the only compound with Ca? I just remember picking a Ca compound.</p>
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<p>Not necessarily. The Ka of H2SO4’s second dissociation is so small that the molar concentration of hydrogen ions wouldn’t be twice the molar concentration of the initial acid. That is, if the acid were dissolved into pure water. The two dissociations would only fully take place in an already basic solution.</p>
<p>H2SO4 –> H+ + HSO4-</p>
<p>HSO4- <–> H+ + SO4 2-</p>
<p>The second dissociation would only take place if the hydrogen ions were reacting with hydroxide ions in solution. This would place a stress on the system, which would begin to produce more hydrogen ions (LeChatelier’s principle). Otherwise, in pure water, a solution of .1M H2SO4 would only have slightly over 0.1M in H+.</p>
<p>It was in a solution of NaOH.</p>
<p>Hmm, debating whether to cancel.</p>
<p>I have 7 wrong for sure, and probably another 3-4 mistakes.</p>
<p>Was aiming for 770+</p>
<p>I’m a sophomore, so I could retake it in June and take the rest of my SAT’s next year.</p>
<p>My advice would be not to cancel. I expect the curve will be generous, so you still stand a chance of getting above a 770. If not, it doesn’t matter. You’ll surely get above a 750, and that is more than enough for college admissions.</p>
<p>Seriously, ignore the whole CC mentality. A 750 is perfectly acceptable, and is even very good. College adcoms don’t care about the specific score if it’s above a 750.</p>
<p>wait for the gas one one of the choices were mg and HCl? I always thought metal and acid formed hydrogen gas?</p>
<p>yeah i think i picked the one with HCl becuase of H2 lol</p>
<p>i remember not being able to find a gas
so i probably predicted one wrong 
anyway i just guessed that H2 would form</p>
<p>does anyone remember the exact questions because I thought two answers worekd. zinc and hcl produces h2 gas. Also caco3 and hcl produces co2 gas… what were the exact questons?</p>
<p>so…I deciding whether I should cancel my score or not</p>
<p>but can ANYone just post a predictable score curve for this test?!</p>
<p>dont cancel curve will be huge + score choice, no college can deny you use of score choice since they wont know you used score choice. Collegeboard has stated this on their website</p>
<p>and if your want register for june i registered so i could get another shot at the test</p>
<p>what gas Evolved… the answer was Hcl and zinc confirmed it with teacher
reason
Hcl + zn is zncl + h2 or somthing like that
basically acid + metal equals h2</p>
<p>brass contains zinc and bronze contains iron, right? i always get those confused</p>
<p>so dont cancel the score…?
I did really bad on the test cause I was sick all week
I think I got like 10-12 wrong and 2 omit…(i know…)
anyway if there were a huge curve, what would I have as a score?</p>
<p>Yes. I remembered doing a lab with Zn + HCl to measure the amount of H2 gas produced :)</p>
<p>Also brass = zinc + copper. I just associate brass with instruments and something as hard as iron can’t make beautiful music can it? :P</p>
<p>Also Bronze is copper + tin I think. Iron isn’t in bronze. It’s in steel.</p>
<p>Probably in the 720-760? (Yes big range) Depends on the curve. I really didn’t find it that hard, so I can’t objectively say how big the curve is.</p>
<p>slimy expect 740-750 bro retake in june dats what im doing plus you got score choice
ya h2 correct the co2 ca would actually fizz think of soda…</p>
<p>Honestly, I didn’t find it that hard either. In comparison to the test in the blue book, however, it was definitely harder and for that reason, it will definitely have a more generous curve than the one in the book.</p>
<p>seriously… got sick at the worst time
I knew that the test wasn’t hard at all… but just couldn’t focus
anyway Ill just satisfy with a 750 this time… </p>
<p>have to get above 780s in both chem and physics later!! ahhh-</p>
<p>but wasn’t there also a calcium carbonate + hcl choicfe which also makes co2</p>
<p>so above ppl are saying that the one that creates a gas is something like zn and hcl
but i thought it was caco3+something… which is it?</p>