<p>What was the mistake? I found the correct answer and went by “molecules”.</p>
<p>Oh, I caught my own mistake on the test because I thought first that hydrogen was 1g/mol…</p>
<p>Hydrogen is 1 g/mol unless you’re talking about it in its natural state in which case it’s 2 g/mol.</p>
<p>EDIT:</p>
<p>REMEMBER DIATOMIC MOLECULES:</p>
<p>I
Brought
Clay
For
Our
New
House</p>
<p>Yup, good thing I checked the other answers and checked back. (whew!)</p>
<p>that’s catchy, I am going to use that.</p>
<p>I also use a modified form of it to remember solubility rules, albeit much suckier.</p>
<p>For solubles:</p>
<p>I brought clay chlorate nice tray ace. Sulk(a)y positive.</p>
<p>I Br Cl ClO3- NO3 (nice tray) Acetate SO42-(sulkay=sulfate) NH4+, H+ and alkali metals (+)</p>
<p>For insolubles:</p>
<p>COCO, CROCRO, POPOPO, SuhSuh, HO</p>
<p>Carbonate (CO said twice to remember the charge is “2”), Chromate (CrO4 said twice to remember the charge is “2”), Phosphate (PO4 said thrice to remember the charge is “3”), Sulfide(S said twice to remember charge of “2”)</p>
<p>Of course you wills till have to memorize exceptions such as Ag Hg and Pb in certain compounds.</p>
<p>I prefer BrINClHOF (brink-el-hoff), but that’s quite catchy too</p>
<p>Our AP chem teacher taught us this one: </p>
<p>N, O, F, Cl, Br, and I make a “7” shape on the periodic table. But thats only 6 elements: so you cant forget about hydrogen up there by itself! lol</p>
<p>can anyone who remembers the Cx Oy problem, explain to me how to do it?</p>
<p>thanks</p>
<p>“What would be the formula of CxOy if it is added to .5 of oxygen and produces 2 moles of carbon dioxide?” (I’m pretty sure this was the question)</p>
<p>2 mols CO2 –> 2 moles C, 4 moles O
.5 moles O2 –> 1 mol O</p>
<p>So, 3 moles O and 2 moles C needed: C2O3</p>
<p>ya, that makes more sense.</p>
<p>Thanks for posting the correct question. Here’s how to do it</p>
<p>Set products=reactants</p>
<p>X + 0.5O2=2CO2
In English: compound X and half a mole of diatomic oxygen gas react to form 2 moles of carbon dioxide.</p>
<p>X +O=2C + 4O</p>
<p>Compound X and one oxygen atom react to form 2 carbon atoms and 4 oxygen atoms.</p>
<p>X=2C+3O</p>
<p>Therefore, X= C2O3.</p>
<p>wow that was easy…if only i had time…</p>
<p>thanks</p>
<p>by the way, did anyone get that, in the entire second half of the TTCE’s, the first statement was true?</p>
<p>i think so, not sure…I remember thinking that there were an unusually large number of trues.</p>
<p>I got 7 TTCEs: anyone else?</p>
<p>H2O2 –> H2O + O2
when the above equation is balanced and all the coefficients are reduced to the lowest whole number, what is the coefficient of H2O2?</p>
<p>Does anyone but me remember that being one of the problems. Im pretty sure it was that equation but not 100%</p>
<p>Then you’d get 2 as coefficent of hydrogen peroxide as so many claimed to have.</p>
<p>ugh…thats 8 wrong</p>
<p>yeah PK thats about where I am too :(</p>