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A2 OCR Chemistry B F334 - June 2015

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Original post by TheSprintKing
How did you work out the 97.1 question?


find moles of dichromate, x6 then x mr of iron, that number diveded by mass added x100
I wrote all 3 IM bonds lol will i still get the 2 marks or nah
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Original post by TikiLodge
What oxidation states did every get for the V? I got +4 then the rest +5


same
Reply 744
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TheRAG
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Original post by LordGaben
Really? I thought last years paper was really easy


You found June 2014 easy?:confused: How?
Question 2 was awful
Original post by Jaz_ace
if there is a increase in ph doesnt da mean that the NH gains a hydrogen ions, becomes a base???


Increase in ph means solution is more basic so more OH- ions
Original post by TheRAG
You found June 2014 easy?:confused: How?
Question 2 was awful


I'll take colorimetry over the rate of hydrolysis any day haha. I guess I did it as a mock so its probably not the same.
Reply 747
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TheRAG
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Original post by LordGaben
COOH becomes COO- i think I put


That seems correct, I put OH- - O- + H+, I hope I still get the mark but I doubt I will
any ideas on grade boundaries
Reply 749
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Original post by LordGaben
I'll take colorimetry over the rate of hydrolysis any day haha. I guess I did it as a mock so its probably not the same.


Oh how did you confirm that rate was 1st order?
I found the ratio between (30 and 100) and (220 and 290) (both have a difference of 70) and found both ratios to be the same (0.77)
And did you get 1x10-6 s-1 for the rate constant?
Original post by Jaz_ace
any ideas on grade boundaries


I think this paper was about the same as June 12
Reply 751
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TheRAG
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Original post by pipsini
In question 1 what were the two words to best describe the condensation reaction? neutralisation and elimination? (I'm probably wrong)


How was it supposed to be neutralisation?

Elimination is correct though
Original post by TheRAG
Oh how did you confirm that rate was 1st order?
I found the ratio between (30 and 100) and (220 and 290) (both have a difference of 70) and found both ratios to be the same (0.77)
And did you get 1x10-6 s-1 for the rate constant?


I messed that bit up. i only managed to identify when the conc halved but since I left it for the end I was short on time :/ and yes i did get that for my rate constant
Reply 753
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TheRAG
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What did you all put for the very first question?
I put moderately concentrated hydrochloric acid
Original post by TheRAG
How was it supposed to be neutralisation?

Elimination is correct though


Acid reacting with a base. Carboxylic acid with amine.
Original post by TheRAG
What did you all put for the very first question?
I put moderately concentrated hydrochloric acid

Ammonia. Wasn't it dichloroalkane to diamine?
Original post by jonesy123
Acid reacting with a base. Carboxylic acid with amine.


Addition and elimination. I think its in the spec
Reply 757
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Original post by LordGaben
Addition and elimination. I think its in the spec


I put addition as well, can you confirm this?
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Original post by penguinofdoom
I've got AQA Physics :tongue:


I have but Newtonian World is any easy and interesting module, not like F334 in Chemistry.

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