Edexcel A2 Chemistry 6ch04/05 JUNE 2015 Watch

Wahid1
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#821
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#821
(Original post by Keegs)
Do we need to know anything on the partition co-efficient?
Nope


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Ripper Phoenix
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#822
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#822
(Original post by Hairysweets)
Not acceptable I want grade-boundaries reduced 2-fold
that would lower PH
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Ripper Phoenix
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#823
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#823
EXCUSE YOU? go re check the spec it says clearly about partition coeff! its even come up in a paper as well!

(Original post by Keegs)
Do we need to know anything on the partition co-efficient?
yes you need to know
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Maham88
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#824
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#824
(Original post by Wahid1)
But surely if it's 2:2 you can use the moles on their own?


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im not sure what you are trying to say
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Wahid1
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#825
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#825
(Original post by Maham88)
im not sure what you are trying to say
If there are same moles of products as reactants then you can calculate Kc using moles only right?


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Wahid1
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#826
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#826
(Original post by Ripper Phoenix)
EXCUSE YOU? go re check the spec it says clearly about partition coeff! its even come up in a paper as well!



yes you need to know
Never mind you're right haha

It's basically simply Kc for the substance in the solution and ether. Specifically ether over solution.
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MeeraP07
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#827
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#827
(Original post by Ripper Phoenix)
EXCUSE YOU? go re check the spec it says clearly about partition coeff! its even come up in a paper as well!



yes you need to know
Whats partition co-eff?


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Hairysweets
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#828
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#828
(Original post by Wahid1)
But surely if it's 2:2 you can use the moles on their own?


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You can if volumes for each value is the same, or they're in the same total mixture. I've not seen the question to say if this is applicable but you are right in certain circumstances.. Better not tell uni that's why you didn't get the grade though haha
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AnishaJayne
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#829
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#829
Does anyone have a bunch of acid base hard questions at all? I understand ka ones, how effective the buffer is and ratio ones but just the random ones with excess etc? Sometimes you bung moles in and sometimes you have to work out conc why is this?


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Maham88
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#830
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#830
(Original post by Wahid1)
If there are same moles of products as reactants then you can calculate Kc using moles only right?


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yes if the volumes cancel out
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MeeraP07
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#831
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#831
(Original post by Wahid1)
If there are same moles of products as reactants then you can calculate Kc using moles only right?


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Yes because the volume would just cancel out anyway. So yes if there are the same number of products and reactants in the Kc expression you can use moles.


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ArielHaeems
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#832
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#832
I know this has been asked before, but I didn't find an answer. Do we use the bracketed or non-bracketed values of lattice energy in the data booklet?
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Wahid1
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#833
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#833
(Original post by MeeraP07)
Yes because the volume would just cancel out anyway. So yes if there are the same number of products and reactants in the Kc expression you can use moles.


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But you get a different answer. Doing that would result in Kc value of 1


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AnishaJayne
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#834
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#834
(Original post by MeeraP07)
Whats partition co-eff?


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Kpart is conc of substance in hydrocarbon/ over conc of substance in aqueous.

It shows how many times more soluble the substance is in hydrocarbon than aqueous. It's a separation technique using a separating funnel


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MeeraP07
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#835
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#835
(Original post by ArielHaeems)
I know this has been asked before, but I didn't find an answer. Do we use the bracketed or non-bracketed values of lattice energy in the data booklet?
Non bracketed


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HopefulDentist..
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#836
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#836
http://qualifications.pearson.com/co...e_20120613.pdf

12c anyone?
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baymax96
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#837
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#837
Name:  11356082_910975032298597_329126981_n (1).jpg
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Size:  53.4 KB what is the reason for the chloride ion conc being 0.2?

also please can someone show me how to solve these questions! I'm so confused as to what i'm doing wrong
Attachment 423773423775 the answers are A, D and C

These questions are from the sample assessment paper
thank you in advance!
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ArielHaeems
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#838
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#838
D - the acid chloride
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Wahid1
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#839
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#839
Name:  ImageUploadedByStudent Room1433878944.462661.jpg
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This is actually pissing me off!!!

Even they don't know what they're doing


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Nautic4l
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#840
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#840
http://qualifications.pearson.com/co...e_20130612.pdf


18ai

Questions like these, how do you know what the state symbols are meant to be?
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