Edexcel A2 Chemistry 6ch04/05 JUNE 2015 Watch

Aidenjordan
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#1221
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#1221
(Original post by Mufinator)
it was sodium hydroxide for the transesterification, but then crossed it out for some brain dead reason so now im not getting marked
Did you replace it with something else? If not, the crossed answer will still be marked
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Wahid1
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#1222
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#1222
(Original post by madmenace)
yess I got that... and your entropy change was really positive?????

even tough like 5 molecules were turning into a solid?
Doesn't matter because deltaSsurr compensates.

+400something


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Callum_Stewart
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#1223
(Original post by frozo123)
What would 80/90 be?
Well over 100UMS, I reckon.
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annanoon918
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#1224
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#1224
COMPLETELY FORGOTTEN TO DIVIDE THE BY TOTAL VOLUME when calculating pH.... thats why i got 10.8.... cant even finish the q..... how many points will i lose not diving by the total volume?
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Wahid1
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#1225
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#1225
Unofficial mark scheme

Unofficial mark scheme

Unofficial mark scheme

Unofficial mark scheme

Unofficial mark scheme


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frozo123
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#1226
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#1226
(Original post by Nautic4l)
How did you do it? I wanna see if I got marks for steps
you work out the moles of each one
Then you subtract the moles of the acid from the NaOH
then you work out conc of OH
then you do Kw=(H+)(OH-)
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Wahid1
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#1227
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#1227
(Original post by annanoon918)
COMPLETELY FORGOTTEN TO DIVIDE THE BY TOTAL VOLUME when calculating pH.... thats why i got 10.8.... cant even finish the q..... how many points will i lose not diving by the total volume?
3 probably


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_bindra
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#1228
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#1228
(Original post by frozo123)
What would 80/90 be?
If that is your raw mark then congratulations! The paper was difficult so expect lower grade boundaries
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Undisclosed 15
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#1229
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#1229
(Original post by frozo123)
What would 80/90 be?
Close to full ums

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hsheahan
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#1230
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#1230
(Original post by _bindra)
I second this
Dilute?
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alexb104
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#1231
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#1231
For the outliers i said that the catalyst may have been broken up more, therefore it would have a greater surface area, therefore an increased rate. This correct?
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#1232
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#1232
Does anyone remember all the questions generally so I can through the paper in my mind

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madmenace
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#1233
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#1233
(Original post by Wahid1)
The only positive from this exam is everyone found the paper difficult...


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the thing is it was so different from the others....

just wanted to get that feeling of smashing unit 4 but im just not feeling it!!!!!!!!!...........

too many questions that I have question marks over

why did I even choose chemistry!!!

does anyone have physics tomorrow?
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Callum_Stewart
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#1234
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#1234
(Original post by Nautic4l)
How did you do it? I wanna see if I got marks for steps
Mols of alkali - mols of acid (should be alkali excess)

Divide no of alkali mols by (65/1000) to get the new concentration

-log(10^-14/new conc. of alkali)
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_bindra
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#1235
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#1235
(Original post by hsheahan)
Dilute?
Conc. But the markscheme never really says any concentrations of catalysts anyway.
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#1236
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#1236
(Original post by madmenace)
the thing is it was so different from the others....

just wanted to get that feeling of smashing unit 4 but im just not feeling it!!!!!!!!!...........

too many questions that I have question marks over

why did I even choose chemistry!!!

does anyone have physics tomorrow?


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I have physics tomorrow. Have to get this exam out of my head first
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frozo123
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#1237
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#1237
(Original post by _bindra)
If that is your raw mark then congratulations! The paper was difficult so expect lower grade boundaries
Idk I'm trying to calculate my worst case scenario lol
probably 77/90 worst case scenario if I -4 and -3 from the anomalous result and the advantages and disadvantages thing
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rowanbarnesss
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#1238
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#1238
Did anyone get 9.somethimg for the pH question?? I think I screwed that one up


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Callum_Stewart
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#1239
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#1239
(Original post by madmenace)
the thing is it was so different from the others....

just wanted to get that feeling of smashing unit 4 but im just not feeling it!!!!!!!!!...........

too many questions that I have question marks over

why did I even choose chemistry!!!

does anyone have physics tomorrow?
Yuuup, capacitors are going to be the f***ing death of me.
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Wahid1
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#1240
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#1240
Predictions per favore


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