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Chemistry PostLab Answers [1/11/12] *Read Description*

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Chemistry PostLab Answers [1/11/12] *Read Description* Empty Chemistry PostLab Answers [1/11/12] *Read Description*

Post by Amy Wed Jan 11, 2012 11:05 pm

What you see is what you get. I will not, under any circumstances
save a few, help you out with anything beyond what I have written here. I
didn't have to aid in the creation of this site. I didn't have to put
hard time into posting this (especially when I've other things I could
be and *need to* be doing). Be grateful, or you'll be IP banned [yes, I
can do so because I have Admin rights. IP ban means you cannot access
the site no matter what you do unless you obtain an entirely new ISP,
and even then I can track you!]

-----If you've read the description, then you know what I *would've* said here!
-------
Remember, the goal of question 1 is to write the equations and BALANCE them, definition of stoichiometric equation*. Just as well as you have to balance, you also have to get the states and colors, not to mention the reaction type!

[ (s) means solid, (l) means...oh, wait, this stuff is in your notes!]
Correct numbers will be bolded. Everything else is up to you to decipher unless you decide otherwise (or are a very special friend)!
-------
1) Reaction 1:
Cu(s) + 4HNO3(aq) ---> Cu(NO3)2(aq) + 2NO2 (g) + 2H2O (l)

Cu, Copper is obviously brown. HNO3, nitric acid from what I recall, is clear. Copper Nitrate is blue, nitrogen dioxide as seen under the fume hood is brown, then water is clear again.
Combustion

Reaction 2:
Cu(NO3)2(aq) + 2NaOH(aq) ---> Cu(OH)2(s) + 2NaNO3(aq)

blue clear blue clear
Double Replacement

Reaction 3:
NaOH(aq) + HNO3(aq) ---> NaNO3(aq) + H2O(l)

clear clear clear clear
Double Replacement

Reaction 4:
Cu(OH)2(s) ---> CuO(s) + H2O(l)

blue blue clear
Decomposition

Reaction 5:
CuO(s) + 2HCl (aq) ---> CuCl2 (aq) + H2O (l)

blue clear blue clear
Double Replacement

Reaction 6:
3CuCl3 (aq) + 2Na3PO4 (aq) ---> Cu3(PO4)2 (s) + 6NaCl(aq)
blue clear blue clear
Double Replacement

Reaction 7:
NaOH (aq) + HCl (aq) ---> NaCl (aq) + H2O (l)
clear clear clear clear
Combustion

Reaction 8:
Cu3(PO4)2 (s) + 3H2SO4 ---> 3CuSO4(aq) + 2H3PO4 (aq)
blue clear blue clear
Double Replacement

Reaction 9:
Zn (s) + CuSO4(aq) ---> ZnSO4(aq) + Cu (s)
silver blue clear redbrown
Single Replacement

Reaction 10:
Zn (s) + H2SO4 (aq) ---> ZnSO4(aq) + H2(g)
black clear clear clear
Single Replacement

Q2) The maximum temperature is
Q3) If the copper is overheated, copper oxide will form thus increasing the percent recovery beyond the "actual" recovery percentage.
Q4) The reclaimed copper looks alike that of brown speakles. If the copper was beaten (melded) more into it's original wire-like shape, perhaps it'd look more like the original copper.
Q5) [varies per group; team ANGCNM got 163.4 percent due to copper oxidation]
Q6) [varies per group; copper gained was .317 for team ANGCNM]
Q7) If you spilled some of the copper-containing chemicals (e.g CuSO4), or if you incorrectly proceed with the decantation process(es), you can risk the loss of some reclaimed copper.
Q8) If you overheat the copper in step 41, or if you do not sufficiently wipe the evaporation dish down in step 42, you could possibly gain some more mass.

---------
*Thank you so much, and you know who you are, for telling me that good piece of information!
Amy
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Post by Amy Thu Jan 12, 2012 7:23 pm

Finished adding them, didn't take as long as I expected.
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Post by Link ATK Fri Jan 13, 2012 6:07 pm

I'm going to quit posting answers publicly as you guys obviously do NOT know how to keep a secret. This isn't here for freebies, it's here for you to learn. Dang.
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