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# AQA - Unit 5 - Energetics, Redox and Inorganic Chemistry watch

1. yeh i got 2+..

square planar and tetrahedral for the shapes
2. (Original post by MoMatrix)
**** didn't divide ammonia by 2 so I got -199.How many marks would I lose.
Did anyone get 298.3 K for the temperature and any less that that would not make it feasible.
Probably 2/3 for the first part. But don't know about the follow up question. Will depend if they allow you to carry over a wrong answer
3. Trying to remember some answers.

-99.5 for something to do with ammonia.
possibly -38 or 39 or something for the bond one, cant remember
temp = 298
so at 800K the reaction was not feasible?

mg = white flames, white solid
s = blue flames, gas given off
not sure on these?

God ive forgotten half the questions already... did people agree with these though?
4. (Original post by MoMatrix)
**** didn't divide ammonia by 2 so I got -199.How many marks would I lose.
Did anyone get 298.3 K for the temperature and any less that that would not make it feasible.
done the same. dont know how many marks i will loose.
5. (Original post by jimmy303)
Octahedral shape yes and the C2O4(2-) form a square planar without the two waters yes because it said the waters were opposite each other.

120 degrees because http://en.wikipedia.org/wiki/Oxalate the carbons are bonded to three things then its trigonal planar, so unless i misread the question (i thought it wanted the bond angle between carbon and the oxygen) then i think it's 120 degrees.

If it asked for bond angles of the coordinate bonds with the metal ion then I'm wrong :P
im sure it asked for o-cu-o bong angle, tho i may have misread the question.
6. yh i think the reaction wasn't feasible at 800k...cuz ^G was positive...
7. (Original post by magicalelf)

-99.5 for something to do with ammonia.
possibly -38 or 39 or something for the bond one, cant remember
temp = 298
so at 800K the reaction was not feasible?

mg = white flames, white solid
s = blue flames, gas given off
not sure on these?

God ive forgotten half the questions already... did people agree with these though?
-99.5 was for working out delta S
Would agree with all those answers you put
8. how many marks would i lose for not divinding the moles by 2
9. (Original post by magicalelf)
im sure it asked for o-cu-o bong angle, tho i may have misread the question.
Pretty certain it asked for O - Cu - O angle, which i said was 90
10. (Original post by jamest92)
Pretty certain it asked for O - Cu - O angle, which i said was 90
same.
11. (Original post by magicalelf)
im sure it asked for o-cu-o bong angle, tho i may have misread the question.
It's funny how these things become blurry in the exam lol. I'm pretty sure i misread it since I tend to gloss over the question. Ah well just one mark
12. (Original post by jimmy303)
It had four ligands so tetrahedral or square planar i think.
yey thats what i wrote
13. (Original post by jamest92)
Pretty certain it asked for O - Cu - O angle, which i said was 90
woop i got 90 too, thought id misread the question and lost a silly mark there.. thank god.

i need to stop worrying over this exam and forgot it now since i can't change anything, physics on monday to worry about now :|
14. FREEDOM!!!

15. For the Cu with C2O42- complex, did people cut draw it with 2 lots of CrO42- and no water ligands? i think i saw on the question that you weren't supposed to draw the water ligands, but i cant remember now!
16. (Original post by jamest92)
-99.5 was for working out delta S
Would agree with all those answers you put
yes i got all of those. execpt i forgot to put white solid for MgO dam. also did you put hydrogen fuel cell or standard hydrogen electrode for the emf one
17. Did people get -0.46 for the E value for the negative terminal?
18. Not wanting to gloat but I think I'd need a good C to get an A overall. How many raw marks do you think I'd need?
19. what did people get as the percentage of iron? 8.74 or something ?
20. (Original post by Betsss)
Did people get -0.46 for the E value for the negative terminal?
Yes and in the CGP book it has the exact example but with their cell as 2.05V, and their answers -0.36. Ours was 2.15V so can be sure -0.46V is right

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