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AQA CHEM5 A2 Chemistry - 19th June 2013

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Original post by marleyxd
For the 3 reasons i put:
Variable Oxidation state
Variable Coordination Number
And Variable Ligand types

is this right??


Yep that's whats it put but without the variable bit. I think it'll be correct
Original post by failingatm
What did people get for the Temperature of the final solution?


298 - 13.something. Temp change, I got 13, subtracted that from initial (reaction was endothermic) to leave me with an answer in Kelvin...dunno if that's correct though.
Reply 2342
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Cwestby
Original post by dhillon1
Yep that's whats it put but without the variable bit. I think it'll be correct


i put the same!
Why did deltaG obey the straight line equation?
Reply 2344
Avatar for Anshul91
Anshul91
What was the colour of the tollens reagent black? Because its not reacted with an aldehyde so isn't silver?
Original post by kurdabora
Got 905
348 for something else



Posted from TSR Mobile


I got +905kJmol-1 for the lattice dissociation of AgCl and I got -7kJmol-1 for the enthalpy of solution one.
(edited 10 years ago)
Reply 2346
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Ren_9
Original post by cat-lover
I did..but it was almost a guess as I just looked at how many can possibly fit around with the total Mr of ammonia and chlorine being equal to 6 water or 6 ammonia..didn't use the info in the question like the grams, volume and concentration. :frown:


I got 1:2 but my method makes no sense. XD And yes, I got +905 :smile:


I got 1:2 ratio on the last question my Z was Co(NH3)6Cl2

Posted from TSR Mobile
Reply 2347
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Cwestby
Original post by Xiomara
298 - 13.something. Temp change, I got 13, subtracted that from initial (reaction was endothermic) to leave me with an answer in Kelvin...dunno if that's correct though.


i did that, but i added the 13 :frown: oh well it will only be one mark
Reply 2348
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Med_me
Bye bye uni :frown:
Original post by Xiomara
Why did deltaG obey the straight line equation?


G = y; T = x; S = m; H = c

Hence, y=mx+c goes to G=H-TS
Reply 2350
Avatar for mulac1
mulac1
tough, tough paper... grade boundaries will be quite low for sure. Did anyone get deltaG = -TdeltaS + 500deltaS for the line?
and 1.111 something for the ratio - these are my 'unsure' answers
Original post by Xiomara
298 - 13.something. Temp change, I got 13, subtracted that from initial (reaction was endothermic) to leave me with an answer in Kelvin...dunno if that's correct though.


I got 11?
Reply 2352
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mulac1
giving [Co(NH3)5Cl]2+
Original post by mulac1
tough, tough paper... grade boundaries will be quite low for sure. Did anyone get deltaG = -TdeltaS + 500deltaS for the line?
and 1.111 something for the ratio - these are my 'unsure' answers


Wait, did we have to do something with the graph!?
I got 1:3 on the last question FML.
And the aldehyde/cobalt 2+/3+ question?
v= 4.25x10^14
Enthalpy lat = +905
Enthalpy solution = 13
enthalpy change in delta g question= 243kjmol-1
Original post by Croydon'Stepper
Wait, did we have to do something with the graph!?


I don't remember being asked to do anything...:frown:
Reply 2358
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SJ12345
Original post by bananarama2
I got 1:3 on the last question FML.


Got that too :smile: 3:1 though
What were the units for v?

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