Guys come here for some of the reactions. All AP chemistry people come

Test Preparation AP Test Preparation
1

<p>Please I don't get the grading system someone help me.</p>

<p>KClO4 (i know its KClO3, but I put O4) --> KCL + O2
Cu2+ + Zn --> Zn2+ + Cu
C6H14 + o2 --> Co2 + h2o
Ni 2+ + Oh- --> Ni(oh)2 (is this a complex)</p>

<p>Finally hear me out on this one.</p>

<p>Ions that appear in the same state do not appear in the overall reaction so..</p>

<p>When Ch3cooh (Aq) + ba(oh)2 (aq) --> bach3coo (aq) + h2o.</p>

<p>I put</p>

<p>H+ +oh- --> h2o</p>

<p>Since bach3coo is (AQ) then both of them are out. I keep hearing though that ch3cooh should stay. Someone explain themselves to me please.</p>

2

<p>Oh and to futher buttress my point : "Omit formulas for any ions or molecules unchanged by the reaction". This is said DIRECTLY on problem 4.</p>

<p>Oh and someone clarify this for me. On b on number 1 it asks for what are the molar [] when u change it to like 2L? I put they remain the same, but I didnt specify the [] over again... will i get full credit ?</p>

3

<p>Oh I forgot to ask my question. I meant to ask how many points would I get? Also did anyone do the reaction above the ammonia and flouride? (I think it had to do w/ phospate) I found it too difficult.</p>

4

<p>for KClO4 one, you'd miss the 1 point for reactants (I think the products are right)</p>

<p>Cu and Zn --> 3 points</p>

<p>C6H14 --> 3 points</p>

<p>Ni+2 --> 3 pints if that's right..... i don't think it's a complex.</p>

<p>the answer is HC2H3O2 (or CH3COOH) b/c acetic acid is weak, meaning it doesn't completely dissasociate in water. that's why you leave the entire acid.</p>

<p>if you said that the concentration remains the same, you'll probably get full credit.</p>

<p>I think the ammonia one is as follows:</p>

<p>NH3 + HF (b/c HF = weak acid) --> NH4+ + F-</p>

<p>zspot says the final product is F2, not F-</p>

<p>It made sense, but I think now it should be F-.</p>

5

<p>Oh ok thanks man. So since I had h2o in the products does that count for anything? Like a point? I heard that for each product you get 1 point and for all the reactants you get 1 point.</p>

6

<p>Princeton Review says:</p>

<p>CH3COOH + OH- --> CH2COO- + HOH</p>

<p>We know this from frequent titration problems.</p>

7

<p>It is F- or the fluoride ion. not diatomic fluoride or F2</p>

8

<p>gyros - you'd get 1 point for your H2O. nothing else.</p>

9

<p>OH nice!!!! Now I got 12 points on the reaction which means close to a 5.</p>

10

<p>gyros: relax man, nothing you can do about it now.</p>

11

<p>does anyone know this reaction?</p>

<p>Solid silver chloride is added to a soultion of concentrated HCl???</p>

12

<p>oooh can someone grade my reactions? (numbers following ions are charges, otherwise they are subscripts)</p>

<p>(B) AgCl + H+ >>> H2 + Cl- + Ag
(C) HC2H3O2 + OH- >>> H2O + C2H3O2-
(E) Zn + Cu2+ >>> Cu + Zn2+
(F) H3P + BCl3 >>> H3PBCl3
(H) C6H14 + O2 >>> CO2 + H2O</p>

13

<p>E and H are right for sure i answered those. I answered B but didnt get that, that net ionic isnt doable i dont know what to do.</p>

14

<p>every net ionic is worth three points. 2 points for the product and 1 point for the reactant.</p>

15

<p>man, haven't been on this board for a while,</p>

<p>for B, i didn't do it on the test because of uncertainty, but i think its
AgCl(s) + H+ --> Ag(s) + H+ + Cl-
Reason: H is more reactive than Ag, since we are given "concentrated" HCl, it is reasonable that H will displace Ag</p>

16

<p>Ni (2+) + OH- ---> Ni(OH)4 (2-)</p>

17

<p>thats what i put for that one, not sure if they take it or not</p>

18

<p>I dont know... Ni(oh) may or may not be a complex... I checked in my chemistry book and I looked at the "complex" chart (showed all the complex's talked IN the book) and Ni(oh)4 2- was not there..</p>

19

<p>I got at least 7 points over 3 questions, and I can't remember which other 2 reactions I put. I can only assume that I got the correct reactants for both of them though. I screwed up on the potassium chlorate one. I said it went to potassium metal and chlorate ion. I don't even know how that's possible, but whatever. I think I put Ni2+ + OH->>>Ni(OH)2, but it seems likely that it's wrong because there is always a complex ion question, and I think this was this year's.</p>

<p>-Brexford-</p>

20

<p>There was only one complex ion reaction problem, and that was the silver chloride one, which I did not pick.</p>

<p>The nickel and hydroxide reaction is solubility. Ni(OH)2.</p>