<p>I think the H2O2 was 4 because you had 4 waters on the products and some other product that contained 4 oxygens.</p>
<p>Also the balancing one with the nitrogens, I THINK the coefficient for N2 was 3.</p>
<p>As of now i have 50 of the questions written and formatted in a word document, lets focus on getting more of the missing questions (i need 7 more T/F questions and 28 Multi Choice) since there were 6 balancing questions which we obvs. wont remember lets aim to get the remaining 22 and 7 T/F. the consensus is there are 6 CEs. if we make a full test we can then analyze our scores, and focuse on remembering our answers and not the questions</p>
<p>Haha, you are my hero!! I agree with the TTCE’s listed a few pages ago. Let’s try to brainstorm</p>
<p>Edit: would you send me that word document at some point??</p>
<p>^ Wow… care to share with us? :] I don’t know which ones you’ve got so far…</p>
<p>its on my other computer, i will get it in 30 mins. sorry about that</p>
<p>the T/Fs i have are the ones listed before, try to remember new ones (we can start with that)</p>
<p>Do you have the T/Fs listed a while ago? Or just the 6 TTCEs from back there and another one.</p>
<p>yea, Pinki10583, see if you can post what you have so far. (Is there a max. text for this forum?)</p>
<p>And I remember the H2O2 question being H2O2 + H2 –> H2O + O2?</p>
<p>I think it was that too?? The onlyy other things it could have been (hahah I listed them out) were
H2 + H2O2 –> 2 H20 or
H2O2 + O2 –> 4H2O or
H2O2 + O2 –> H20 + H2 (which is impossible to balance I think) </p>
<p>which leaves us with 3H2O2 + H2 –> 4H20 + O2? maybe. there might have been something else totally random in it that i forgot</p>
<p>I think it was asking for moles of H2O2? I said 3 or 2 I can’t remember… urgh</p>
<p>i remember putting two moles of H2O2</p>
<p>6H2O2 + 4H2 –> 10H2O + O2</p>
<p>If it was the problem that Margaret said, then that^^ would be the balanced equation.</p>
<p>Same. Maybe it was a different equation.</p>
<p>3H2O2 + H2 –> 4H20 + O2
isn’t that balanced to ^
edit: it probably isn’t i just cant think now</p>
<p>Yep that is balanced too. That’s weird though. I’ve never seen something like that (an equation being balanced in 2 different ways yet still having the lowest possible whole number coefficients).</p>
<p>That’s soo weird! That really makes me doubt that that was the equation, I doubt they would put something with two possible answers…?</p>
<p>4H2O2+2H2->6H20+O2
is also balanced. Hmmm…</p>
<p>i think when anyone has to do 85 questions in one hour its really easy to mix up H20, H2O2, O2, and H2 in an equation when trying to recall it after the test lol</p>
<p>i knoww. wait just out of curious/im too lazy to start a new thread, have any of you retaken a science SAT II the next year, even though you no longer take the science? </p>
<p>Ex: I take chem this year. Took chem SAT II this sat. Might want to retake in october…</p>
<p>I usually solve balanced equations by a careful method of trial-and-error, but this time I tried some algebra:</p>
<p>AH2O2+BH2->CH20+DO2</p>
<p>To balance out the H:</p>
<p>C=A+B</p>
<p>To balance out the O:</p>
<p>A=0.5C+D</p>
<p>Now just plug in random numbers:</p>
<p>A=9
B=7
C=9+7
C=16
A=0.5C+D
9=8+D
D=1</p>
<p>9H202 + 7H2 -> 16H20 + O2</p>
<p>If you got decimals, then multiply the whole thing by a number to get integers.</p>
<p>If you got integers, then change the numbers that you chose to plug in.</p>