Edexcel - Chemistry Unit 2 - 4 June 2013

Section c always has a random topic each time so that is hard say, also do we need to know how to turn an amine, alcohol and an alkene back to a halgenoalkane, or do we just need to know the forward reactions?

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Omg thank you so muchh! and baiscally that oil layer is the hydrocarbon right? thanks again

is the answer a ? If so...

The ratio between reaction of sulfuric acid & barium hydroxide is 1:1 ... Therefore they must both equal the same amount of moles.

Moles = volume x concentration

therefore... Mole of sulfuric acid = 0.02 x 0.25 = 0.005

there must also be 0.005 moles of barium hydroxide, therefore:

Volume= moles/ concentration = 0.005/ 0.5 = 0.01

woops my bad they want it in cm^3... Here we have our answer in dm^3

1dm^3 = 1000 cm^3
so...

0.01 x 1000 = 10 cm^3

This is what I've come up with, let me know if it makes sense or not

Has anyone got a copy of Jan 2013's paper?

Has anyone else found the January 2013 paper really really difficult? :/

How are we supposed to know the bond angle in cyclohexanol? (I don't do maths either..!)

I hope this june paper is nicer

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Hi everyone! I'm really confused about extracting the products of alcohols. In one of my text books it says to extract a ketone you heat under reflux and in the other it says you use distillation apparatus, so which one do I write? Also, when extracting a carboxylic acid, do you just heat alcohol under reflux or do you do that then distill it? So confused :/

Hi everyone! I'm really confused about extracting the products of alcohols. In one of my text books it says to extract a ketone you heat under reflux and in the other it says you use distillation apparatus, so which one do I write? Also, when extracting a carboxylic acid, do you just heat alcohol under reflux or do you do that then distill it? So confused :/

With a carboxylic acid, you just heat the reactants until reflux and let the product drop back into the reaction mixture, after some period of time you'll get a carboxylic acid. I think it's the same for a ketone, we only distill off aldehydes because it we didn't, they would oxidise into carboxylic acids, although I may be incorrect there.

For both reflux then distil once reaction has gone to completion


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Hey guys. I have no idea which practical apparatus we need to know how to draw? Apart from reflux and distilling. Every now and again something comes up and I have no idea. I asked my teacher for a complete list and she dodged my question. Help please! (I'm using Edexcel exam board)

I was a bit mean but not that bad, that said, I also hope the June paper is nicer.

**January 2013 paper here!**

Found a little website with quizzes to test your knowledge, Edexcel specification. It's quite pedantic though and doesn't cover everything, but if you're bored...
http://legacy.chemgym.net/as_a2/index_edexcel.html

Thanks a lot! Do you have the mark scheme by any chance?