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ocr a f325 revision thread

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Original post by MathsNerd1
Pretty strictly, I was reading everything that was allowed and what I actually put and mark it accordingly, why don't you believe I'm capable of that mark?


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No of course you can, you are so smart!!


I know some people who mark them selves right and give themselves half marks and giving them selves benefit of doubt marks
Original post by otrivine
No of course you can, you are so smart!!


I know some people who mark them selves right and give themselves half marks and giving them selves benefit of doubt marks


I'm not like that as its pointless giving yourself false hope to be knocked down later.

What's the highest the A has actually been in this exam?


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Original post by MathsNerd1
I'm not like that as its pointless giving yourself false hope to be knocked down later.

What's the highest the A has actually been in this exam?


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I think approx 78, so if you get 80 you will be on the safe side :smile:
has anyone done june 2010 here? :smile:
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Namod
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Original post by MathsNerd1
First test under conditions. Got 82/100 on Jan 2011 and considering an A was 65 would anyone be confident to say what type of UMS this would get me? Quite a nice exam really with a few interesting parts but nothing that got me too bad :smile:


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Now how you done question 7(a)(i) in the paper?
How you got the moles of O2
Original post by Namod
Now how you done question 7(a)(i) in the paper?
How you got the moles of O2


Well I only got 1 mark for this as went about it the wrong way I believe but it's your moles of S2O3^2- divided by 4


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Original post by MedMed12
has anyone done june 2010 here? :smile:


Yes :smile: is there a question I can help you with/
Original post by otrivine
I think approx 78, so if you get 80 you will be on the safe side :smile:


Highest for A*?


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Ethanoic acid (CH3COOH) is completely soluble in water and dissociates as
follows:
CH3COOH(aq) ⇌ CH3COO-(aq) + H+(aq)

Ka = 1.8 × 10-5 mol dm-3
Select the one statement that CORRECTLY describes what happens when the soluble
salt sodium ethanoate, which is present in water as sodium ions (Na+) and ethanoate
ions (CH3COO-) is added to an aqueous solution of ethanoic acid.

A More ethanoic acid will dissociate into ions
B The value of the ionisation constant Ka will increase

C The pH of the solution will increase
D The value of the ionic product of water will increase
E The value of the ionisation constant Ka will decrease


what do you think is the write answer? A,B,C,D or E?
Original post by otrivine
Yes :smile: is there a question I can help you with/



the one with A B C how did you know it was cr203? :smile:
apart from that question it was fine
Original post by MedMed12
the one with A B C how did you know it was cr203? :smile:
apart from that question it was fine


Do you have the question number by any chance :smile:
Original post by MathsNerd1
Highest for A*?


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Max = 83ish
Original post by otrivine
Do you have the question number by any chance :smile:



6e :smile:

Original post by otrivine
Max = 83ish


same as bio
Original post by otrivine
Max = 83ish


Seriously?? But surely the calculation questions get you almost half marks, along with the transition metal and buffer ones, then there are a few redox and some electrode and fuel cells and its done really.

As I seem to only struggle on the electrode parts, nothing else I'm feeling pretty darn confident about next week now! I won't get complacent though.


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Original post by MedMed12
6e :smile:



same as bio


there is no 6)e)?
Original post by otrivine
Ethanoic acid (CH3COOH) is completely soluble in water and dissociates as
follows:
CH3COOH(aq) ⇌ CH3COO-(aq) + H+(aq)

Ka = 1.8 × 10-5 mol dm-3
Select the one statement that CORRECTLY describes what happens when the soluble
salt sodium ethanoate, which is present in water as sodium ions (Na+) and ethanoate
ions (CH3COO-) is added to an aqueous solution of ethanoic acid.

A More ethanoic acid will dissociate into ions
B The value of the ionisation constant Ka will increase

C The pH of the solution will increase
D The value of the ionic product of water will increase
E The value of the ionisation constant Ka will decrease


what do you think is the write answer? A,B,C,D or E?


C. Volume increases so [H+] decreases. Temperature is constant so Ka and Kw constant.
Original post by MedMed12
the one with A B C how did you know it was cr203? :smile:
apart from that question it was fine


Ethanoic acid (CH3COOH) is completely soluble in water and dissociates as
follows:
CH3COOH(aq) ⇌ CH3COO-(aq) + H+(aq)

Ka = 1.8 × 10-5 mol dm-3
Select the one statement that CORRECTLY describes what happens when the soluble
salt sodium ethanoate, which is present in water as sodium ions (Na+) and ethanoate
ions (CH3COO-) is added to an aqueous solution of ethanoic acid.

A More ethanoic acid will dissociate into ions
B The value of the ionisation constant Ka will increase

C The pH of the solution will increase
D The value of the ionic product of water will increase
E The value of the ionisation constant Ka will decrease


what do you think is the write answer? A,B,C,D or E?
Original post by louisjevans
C. Volume increases so [H+] decreases. Temperature is constant so Ka and Kw constant.


I thought it was D because you are adding alkali so equilibrium shifts to left to restore Ph value and so Ka value decreases ?
Original post by otrivine
Ethanoic acid (CH3COOH) is completely soluble in water and dissociates as
follows:
CH3COOH(aq) ⇌ CH3COO-(aq) + H+(aq)

Ka = 1.8 × 10-5 mol dm-3
Select the one statement that CORRECTLY describes what happens when the soluble
salt sodium ethanoate, which is present in water as sodium ions (Na+) and ethanoate
ions (CH3COO-) is added to an aqueous solution of ethanoic acid.

A More ethanoic acid will dissociate into ions
B The value of the ionisation constant Ka will increase

C The pH of the solution will increase
D The value of the ionic product of water will increase
E The value of the ionisation constant Ka will decrease


what do you think is the write answer? A,B,C,D or E?

is it E?
Original post by otrivine
there is no 6)e)?


ocr chem A june 2010 ? 6e
its 8 marks

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