Edexcel A2 Chemistry 6ch04/05 JUNE 2015

I put that it makes it sour too. Thought that was correct?

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

I did the 79% yield one like this:

100 Sodium Theoxide(?) (Mr =116) made 79 Asprin (Mr = 180)

Therefore, 100 x 116 in relative weight made 79 x 180.
11,600 made 14,220

14,220 was bigger than 11,600. The ratio of 14,220/11,600 multiplied by 2.5 tonnes gave you the value.

Reasoning: every 1/11,600th of a weight will give you 14,220. I got an answer of 3.06... which rounded to 3.1 for the 2sf specification.

Anyone put triplet and doublet?

KOH for biodiesel Q?

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

I believe the gas was oxygen as not suitable for chromatography

Catalyst in transesterification?

is it for GCE or IAL????

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 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 :/

Niet.

One was a quartet remember


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I got 3.1 then crossed it out 😩😩😩 fml thought it was wrong


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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.

The first question was Z-2-chloro-pent-2-ene or something like that, and I got O2 as the gas which wasn't suitable, -12 is right

as long as you didn't replace it with some retarded answer, they should mark your crossing outs

Fair enough and I have KOH in my notes :/ I think it's a strong alkali catalyst


Anyone remember how many marks the very last question was? CHemical shift one

RIP

i wrote quadruplet instead of quartet do you think they'll take it lol

No way it was entgegen which means opposite in German. E


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