<p>Please help!!! Does anyone know the answer to the one with the copper reacting in the nitrate solution forming colorless and brown gases at different solution concentrations? Was it E? (different concentration yeilds different products)</p>
<p>yeah because that's the only choice we can derive solely from observation</p>
<p>awww i put hydrogen cuz</p>
<p>Cu + HNO3 ----> H2 + Cu^2+ + (NO3)^1-</p>
<p>Thanks tonsofguns,
The reason i didnt put hydrogen was because i thought this rxn is also possible for the brown gas one:</p>
<p>Cu + HNO3 --> CuO + NO2 + H+ (or some variation of that that would yield NO2 gas which is the brown one)</p>
<p>it was definitely e.. END OF DISCUSSION!! hah</p>
<p>what about the charge on manganese?</p>
<p>the three questions from beginning of the test confused me so much. they went something like this :
[He] 2s2 2p balbhalbh
[Ar] 3p 3d</p>
<p>do you guys know what i'm talking about</p>
<p>yes i do...the one with unpaired electrons was A) O - [He]2s2 2p4</p>
<p>Overall, I think I did really well. The only question I left blank was the water displacement one. If I'm sure about almost all of them, is that a good chance for 800?</p>
<p>what'd put for the question with adding something to a saturated solution?
I put E (no change).. cus saturated means the solvent has its "maximum" amount of solute.. so it can't dissolve any more.
But then.. I was worried abuot supersaturated..which is not "theoretically possible" ... idk</p>
<p>Proctor: "you have 20 mins left"
Me: (in my head) "F**K I have over 40 questions to go!"</p>
<p>But I was able to pull through : )</p>
<p>One of the T T Ce question, the one about acid and water, it was T T Ce? right? becuase you're supposed to put the acid in the water, because when you pour a liquid into another, it might splash back, and what splashes is the what is originally in the beaker, which you hope is water so that you don't acid on yourself. Correct?</p>
<p>Also, a catalyst decreases the activation energy, not increases it, correct?</p>
<p><em>prays for a grade over 700 :/</em></p>
<p>dream, I said the same as you did...i put e, b/c if I remember correctly it said that it had NaCl (or w/e it was) crystal in it, so I assumed that adding more wouldn't do anything to it since it already had excess...</p>
<p>can anyone think of some questions from the first part?
I skipped #12 but can't remember what it was..</p>
<p>I too put E for the supersaturated one. Adding extra solute at equilibrium does not change the concentration</p>
<p>The graphite one was the best because I skipped it and then figured it out while I was bubbling in answers from the later half of the test (the machine uses the conductivity to determine which answer bubble you picked). So, yes, there was a question about the test on the test.</p>
<p>covalent + ionic is NH4Br</p>
<p>the acid and water one was f,f</p>
<p>the question was worded like
you are supposed to put water into the acid.</p>
<p>for the water adding to sulfuric acid one, I put TTCE. It might be just TT though, I'm not sure...</p>
<p>anonymous: i never knew that that's how they scanned it...(i got the question right though)...i guess you learn something new everyday</p>
<p>no. It was worded: in a laboratory, you should never add water to a concentrated sulfuric acid sample. BECAUSE a sulfuric acid and water reaction is highly exothermic and might cause it to splatter.</p>
<p>I put T T CE</p>
<p>are the tests same all year round</p>