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    (Original post by zhang-liao)
    :woo: Finished all my mocks
    congrats :cool: same here
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    Is anyone here participating in the Chemistry Olympiad?
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    Yep

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    (Original post by haemo)
    AQA?



    :woo:
    Yep!

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    (Original post by Heretohelp!)
    Yep

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    Aren't the papers similar to the Cambridge Chemistry Challenge Lower Sixth Comp papers?
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    Anyone done Chem ocr AS any of the papers like qual quant or evaluative please PM me because I need like advice. I've done the quantitative but like unsure what to revise for the other two :/

    Also if you want earlier past papers which aren't on the ocr website can we get these?
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    (Original post by zhang-liao)
    Aren't the papers similar to the Cambridge Chemistry Challenge Lower Sixth Comp papers?
    The format (font, style, layout etc) is basically the same though the questions are more difficult. How are you preparing?
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    (Original post by Dylann)
    The format (font, style, layout etc) is basically the same though the questions are more difficult. How are you preparing?
    I just found out I was going to do it this week, so far I've been looking at past papers, how about you? Haven't done much revision for it though
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    (Original post by zhang-liao)
    I just found out I was going to do it this week, so far I've been looking at past papers, how about you? Haven't done much revision for it though
    Past papers, advanced starters for ten, youtube, general revision etc
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    Started Unit 2 and its awesome :awesome:

    I have got a question though.

    Hexan-1-ol was heated gently with a mixture of potassium dichromate and sulphuric acid. The product of the reaction was distilled off as it formed. Give the structural formula of the product and name it.

    So I was thinking, it becomes an Aldehyde, because the question didn't say anything like 'excess' potassium dichromate, etc.. But Idk i'm just wondering.. Aldehyde or Carboxylic acid? :angelblush:

    (Original post by Dylann)
    x
    Please :hugs:
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    It would be an aldehyde because its being distilled off and a carboxylic acid if it was a reflux

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    Anyone care to help me with the following.

    Give the structure and name of every haloalkane that could be produced by the reaction of methane with chlorine.
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    (Original post by Dinaa)
    Started Unit 2 and its awesome :awesome:

    I have got a question though.

    Hexan-1-ol was heated gently with a mixture of potassium dichromate and sulphuric acid. The product of the reaction was distilled off as it formed. Give the structural formula of the product and name it.

    So I was thinking, it becomes an Aldehyde, because the question didn't say anything like 'excess' potassium dichromate, etc.. But Idk i'm just wondering.. Aldehyde or Carboxylic acid? :angelblush:



    Please :hugs:
    The word that gives you a massive hint is 'distilled'.

    Oxidation under a distillation setup would yield an aldehyde.

    If however the question hinted that the apparatus would be under reflux, you should immediately know that the final oxidised product will be a carboxylic acid. Apparatus for reflux.

    Here is a diagram that shows both of em side by side.



    Don't be thrown by the question mentioning 'excess' or not. Just remember that you can control what the final product is formed just by changing the apparatus
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    Hello everyone!

    I did AQA AS Chemistry last year and I got a grade A.

    I would like to pass on some advice.

    To help me get by I used the CGP textbook revision guide which I found incredibly useful and the way they explain the content is really detailed.

    AS Level Chemistry for AQA: Student Book

    Sample Pages

    I also understand that not all of you do AQA Chemistry but instead from a different exam board so I thought it was best to show you guys the other CGP editions for different exam boards for AS Chemistry in this link.

    Good luck with your exams!
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    I have a question that is asking to write an equation for incomplete combustion that produces only gaseous products. What are the gaseous products? Can CO and CO2 both be products of that same equations or is there others.
    Thanks

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    (Original post by SFarooq)
    I have a question that is asking to write an equation for incomplete combustion that produces only gaseous products. What are the gaseous products? Can CO and CO2 both be products of that same equations or is there others.
    Thanks

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    It's incomplete so it can only produce H2O and either solid carbon or CO. However since the products must be gaseous it must be CO...

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    So CO AND CO2??

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    (Original post by SFarooq)
    So CO AND CO2??

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    What is the actual question. For incomplete combustion you can only form carbon monoxide and water.
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    (Original post by SFarooq)
    So CO AND CO2??

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    I'm guessing you had the Edexcel mock like myself? When its complete combustion it forms CO2 (carbon dioxide), when its incomplete combustion is forms CO (carbon monoxide)
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    (Original post by Dinaa)
    Started Unit 2 and its awesome :awesome:

    I have got a question though.

    Hexan-1-ol was heated gently with a mixture of potassium dichromate and sulphuric acid. The product of the reaction was distilled off as it formed. Give the structural formula of the product and name it.

    So I was thinking, it becomes an Aldehyde, because the question didn't say anything like 'excess' potassium dichromate, etc.. But Idk i'm just wondering.. Aldehyde or Carboxylic acid? :angelblush:



    Please :hugs:
    Hexanal would form. Heat under reflux = carboxylic axid. Distillation = aldehyde.


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