Qualification > Sciences
ALL CIE CHEMISTRY DOUBTS HERE !!
Master_Key:
--- Quote from: ~~!$!HUSH!$!~~ on May 15, 2011, 06:59:19 am ---Nice one master key, +rep :)
--- End quote ---
Thank you.
EMO123:
--- Quote ---Esters are a useful group of compounds due to their distinctive smells. One example
of an ester is ethyl ethanoate, its formation is shown below.
CH3COOH(aq) + C2H5OH(aq)?CH3COO C2H5(aq)
+ H2O(l)
a) Systems like this are described as being a 'dynamic equilibrium'. Explain
the term 'dynamic equilibrium'
b) Write down the expression for the equilibrium constant, Kc, for this reaction.
c) Calculate the value of Kc for this reaction given the equilibrium concentrations below.
[CH3COOH] = 0.08 moldm-3
[C2H5OH] = 0.08 moldm-3
[CH3COO C2H5] = 0.25 moldm-3
[H2O] = 0.1 moldm-3
d) Concentrated sulphuric acid is added to the reaction mixture as it removes water molecules. What effect would this have on the equilibrium position of this system?
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need the answer of D)
EMO123:
--- Quote ---2. The Haber-Bosch process is used for the large-scale production of ammonia from
nitrogen and hydrogen gas. The reaction is shown below:
N2(g) + 3H2(g)?2NH3(g)
a) Write an expression for Kp for this reaction.
b) What are the units of Kp for this reaction? (Assume pressure is measured in kPa)
c) When the temperature is raised for this process the proportion of NH3(g) in the mixture decreases. Explain this observation.
d) What effect will an increase in the total pressure have on the equilibrium position?
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i have doubt in B)
aneeta:
OMG OMG!!! IM FREAKING OUT ABOUT PAPER 2 TOMORROW!! x_x ORGANIC IS KILLING ME!! ANY SUGGESTIONS?!
aldehyde1612:
--- Quote from: aneeta on May 15, 2011, 12:33:26 pm ---OMG OMG!!! IM FREAKING OUT ABOUT PAPER 2 TOMORROW!! x_x ORGANIC IS KILLING ME!! ANY SUGGESTIONS?!
--- End quote ---
just relax.. and stop freaking out!
I suggest you dont study any chem for now... just quickly skim over your short notes and stuff if you havent done so already. THEN STOP. listen to music and take a walk .. or something, anything and STOP FREAKING OUT. You'll be fine.
And if tomoro it gets too hectic.. just breaaathe. ;D
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