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Edexcel - Chemistry Unit 2 - 4 June 2013 Watch

  • View Poll Results: Which topic(s) are you finding most difficult?
    Shapes of molecules and ions
    11.66%
    Intermediate bonding and bond polarity
    15.95%
    Intermolecular forces
    9.82%
    Redox
    17.79%
    Group 2 & 7
    40.49%
    Kinetics & Equilibria
    14.11%
    Organic Chemistry - Alcohols and Halogenoalkanes
    39.26%
    Mechanisms
    26.38%
    Green Chemistry
    28.83%

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    (Original post by Jayqwe)
    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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    As far as I'm aware you only need to know the reaction to produce an amine, not the other way around. But you do need to know both reactions for haloalkane -> alcohol and alcohol -> haloalkane.

    (Original post by Priya08)
    Omg thank you so muchh! and baiscally that oil layer is the hydrocarbon right? thanks again
    Yah.
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    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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    Has anyone got a copy of Jan 2013's paper?
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    (Original post by posthumus)
    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

    thank you
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    (Original post by Gnome :))
    This is what I've come up with, let me know if it makes sense or not
    Aww i got it!Thanks!
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    (Original post by scientific222)
    Has anyone got a copy of Jan 2013's paper?

    (Original post by all_dolled_up)
    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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    I was a bit mean but not that bad, that said, I also hope the June paper is nicer.

    **January 2013 paper here!**
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  1. File Type: pdf Unit 2 - January 2013.pdf (444.7 KB, 68 views)
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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 :/
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    (Original post by ellexo)
    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 :/
    For both reflux then distil once reaction has gone to completion


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    (Original post by ellexo)
    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.
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    (Original post by HarryMWilliams)
    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.
    Thanks so much! I think you're right, it sounds logical and makes sense now
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    (Original post by Goods)
    For both reflux then distil once reaction has gone to completion


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    Thanks for your help!
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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)
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    (Original post by Brownie12335)
    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)
    Ok, from my reading of the specification we need to know the following:
    • An experiment to demonstrate the thermal decomposition of nitrates/carbonates/sulfates - limewater experiment.
    • Preparation of organic liquids, through both refluxing and distillation - making an aldehyde for example.
    • Preparing a halogenoalkane from an alcohol through a separating funnel and then distillation.
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    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
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    Does anyone know of a past question which asks us to draw the apparatus needed for the preparation of a halogenoalkane from an alcohol so i can see what they want in a mark scheme?
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    is anyone else struggling to learn everything for the halogens? all the reactions!
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    (Original post by HarryMWilliams)
    I was a bit mean but not that bad, that said, I also hope the June paper is nicer.

    **January 2013 paper here!**
    Thanks a lot! Do you have the mark scheme by any chance?
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    (Original post by adi19956)
    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 ! Looks useful
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    (Original post by scientific222)
    Thanks a lot! Do you have the mark scheme by any chance?
    MS is here: http://www.thestudentroom.co.uk/atta...hmentid=203014
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    A bit of reaction mechanism practice; would anyone like to explain the procedure of producing a carboxylic acid from ethane? (Hint: there are multiple steps.. )
 
 
 
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