Qualification > Sciences
ALL CIE CHEMISTRY DOUBTS HERE !!
Deadly_king:
--- Quote from: moon on November 13, 2010, 11:49:49 am ---I have attached June 2001 as well as November 2001.It seems that these exams are difficult to find so i thought these might help you practice more questions. Best wishes ;) :)
--- End quote ---
Thank you very much for thinking about us dude. :D
Really appreciated. :)
+rep
moon:
Anytime ... ;)
moon:
here are the markskemes for june & Nov.2001 ;)
moon:
pls I need help in Nov.06 Q9, 11 12 31, 32.
June 01 Q6,11,37
thanks for ur help. :) :)
Hypernova:
--- Quote from: moon on November 12, 2010, 01:37:06 am ---plzzzzzzzzz help me in these questions. :-[ :-[June 07 Q 1, 9
June 01 Q6,11,37
June 2002 Q 38
I would really apreciate any help. thanx a lot. :)
--- End quote ---
Was waiting for the marking scheme..i don't post untill im 100% sure
June 01 Q6
See the attached file
Using Hess's law, the enthalpy change of a reaction is the same, irrespective of the route taken
So we choose the route I drew.
If we move in the direction of the reaction we add the enthalpy change, if we move in the opposite direction to the reaction, we subract the enthalpy change, so
the equation looks like this
-109 - -111 + -395
=-393 KJ/mol
Ans is C
11)
Its a basice math question that tests your ability to read of the graph.
They want the fraction of molecules higher than the activation energy
That is: the total number of molecules above Ea
total number of molecules
so the total number of molecules above Ea is reprisented by the areas shaded R and Q
and
total number of molecules is represented by the areas shaded P and Q
which is: Q + R
P + Q
37)
Can't do it, its got something to do with oxinumbers
thanks for the papers
+Reputation
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