Edexcel A2 Chemistry 6ch04/05 JUNE 2015 Watch

MoHoosen9167
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What did you guys say a reason for the data being useful? I said because [X] changes so it tells you whether or not [X] has an effect on the rate?
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Wahid1
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(Original post by MoHoosen9167)
What did you guys say a reason for the data being useful? I said because [X] changes so it tells you whether or not [X] has an effect on the rate?
Allows you to find rate equation...


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HappyCheesecake
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I got A for the first multiple choice, B for the second, carbon dioxide as the one not suitable in gas chromatography, cyclohexane for the ultraviolet one, 0.56 for the NO2 at 40%, -12 for the caesium fluoride (think this is wrong though), 0.6 for the concentration of NO2 at equilibrium. Potassium dichromate giving positive test with ethane-1, 2-diol, sodium carbonate for effervescense of carboxylic acid.

I had NaOH as the catalyst, k=0.21mol-1dm3s-1, ethanoyl chloride and condensation, 3.1 tonnes for the yield, should have been Sn1 not Sn2 as order of reaction is one and the bromoalkane was tertiary (?), step 1 should have been slow step (?). 11.87 as the pH of the solution, pH higher than 7 because titrating strong base against weak acid. Buffer region for the titration curve so resists changes in pH so addition of OH- gives you propanoate and water, sour taste for the effect on food. Can't remember any more off the top of my head :/
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Nautic4l
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Anyone put triplet and doublet?

KOH for biodiesel Q?

And what was the technique to extract the oil..?
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Wahid1
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What technique did you use for oil?

Heat and distill?


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LibertyB96
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What'd you guys get for the S total???
Can't remember if I got my cycle right way round to work out the enthalpy xD
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cerlohee
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(Original post by Wahid1)
pH of 12.

Would make it sour (which I got wrong)


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I wrote that too... What's the right answer then?
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ojstratton
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A* - 75
a - 68
b - 61
c - 54
d - 47

???
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hsheahan
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When does an unofficial Mark scheme come out? Or is it not like maths?
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rasil23
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(Original post by HappyCheesecake)
I got A for the first multiple choice, B for the second, carbon dioxide as the one not suitable in gas chromatography, cyclohexane for the ultraviolet one, 0.56 for the NO2 at 40%, -12 for the caesium fluoride (think this is wrong though), 0.6 for the concentration of NO2 at equilibrium. Potassium dichromate giving positive test with ethane-1, 2-diol, sodium carbonate for effervescense of carboxylic acid.

I had NaOH as the catalyst, k=0.21mol-1dm3s-1, ethanoyl chloride and condensation, 3.1 tonnes for the yield, should have been Sn1 not Sn2 as order of reaction is one and the bromoalkane was tertiary (?), step 1 should have been slow step (?). 11.87 as the pH of the solution, pH higher than 7 because titrating strong base against weak acid. Buffer region for the titration curve so resists changes in pH so addition of OH- gives you propanoate and water, sour taste for the effect on food. Can't remember any more off the top of my head :/
I believe the gas was oxygen as not suitable for chromatography
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Wahid1
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(Original post by Nautic4l)
Anyone put triplet and doublet?
Niet.

One was a quartet remember


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Infamous7
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(Original post by frozo123)
LAD, I remember you from last year, how you find it?
I remember you too haha. Yeah not too bad, definitely got atleast an A that's for sure, but really want the a*, so let's see. lol
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tiffanyyyyyyy
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At the beginning of one of the questions, it said something like "instant coffee can be made from adding boiling water to coffee grounds". I just giggled to myself. That sentence was so irrelevant. 😂😂😂
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Amir52
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(Original post by ojstratton)
A* - 75
a - 68
b - 61
c - 54
d - 47

???
is it for GCE or IAL????
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MoHoosen9167
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(Original post by Nautic4l)
Anyone put triplet and doublet?

KOH for biodiesel Q?

And what was the technique to extract the oil..?

I can't remember the first one

I put H2SO4, because it's transesterification?

And I said separating using a separating funnel, and letting the oil layer run out.
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Wahid1
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(Original post by hsheahan)
When does an unofficial Mark scheme come out? Or is it not like maths?
When one of us decides to do it


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LibertyB96
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(Original post by Nautic4l)
Anyone put triplet and doublet?

KOH for biodiesel Q?

And what was the technique to extract the oil..?
I put Triplet & Quarlet as H2 group joins onto CH3 group hence n+1

I put sulfuric acid for Q catalyst (if that's what you're asking, can't remember the question :P)

& for technique I said Filtration..
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Wahid1
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(Original post by MoHoosen9167)
I can't remember the first one

I put H2SO4, because it's transesterification?

And I said separating using a separating funnel, and letting the oil layer run out.
Defo not separating funnel because they specifically say those two dissolve


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Wahid1
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(Original post by ojstratton)
A* - 75
a - 68
b - 61
c - 54
d - 47

???
65 for an A perhaps based on the reaction here.


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ojstratton
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(Original post by HappyCheesecake)
carbon dioxide as the one not suitable in gas chromatography, cyclohexane for the ultraviolet one
Oxygen as not suitable - reacts with things
cyclohexanol for the microwave one because molecule has a dipole
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