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    (Original post by BBeyond)
    I hate these drawing questions http://gyazo.com/347ea8636b70bd8cd64df98ea70316c6 What do I draw??
    u r right, they r hard nd confusingly complicated.
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    I did CCEA chemistry to A level, so I'm here to help ^^
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    Easter holidays coming up currently doing aqa as chem, wanna make a timetable to stick to, any suggestions for how i should do it + any general revision tips

    Thanks


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    (Original post by yung7up)
    Easter holidays coming up currently doing aqa as chem, wanna make a timetable to stick to, any suggestions for how i should do it + any general revision tips

    Thanks


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    Make a timetable and stick to it. Do plenty of past papers and get into good exam habits.
    For example,say you got a question on ionisation energies across the period.
    First you will highlight the command word,and see the number of marks.This will give you an idea how to answer the question.
    You would write out beside the questions the keywords atomic radius,number of protons, nuclear attraction and electron shielding. As you answer the question you will tick off the words to make sure you havent left any of the key factors out.
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    (Original post by Kadak)
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    Make a timetable and stick to it. Do plenty of past papers and get into good exam habits.
    For example,say you got a question on ionisation energies across the period.
    First you will highlight the command word,and see the number of marks.This will give you an idea how to answer the question.
    You would write out beside the questions the keywords atomic radius,number of protons, nuclear attraction and electron shielding. As you answer the question you will tick off the words to make sure you havent left any of the key factors out.
    Yh thats exactly what im doing except mentally lol im fairly confident with unit 1 so ill be focusing on unit 2 mainly but thank you very much


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    Bit of halides help required. This topic is a bit of a ****.

    Right so the reaction with sodium iodide and and sulphuric acid.

    Is it NaI(s) + H2SO4(l) --> NaHSO2(s) + HI(g)

    Is this an acid-base reaction.

    Is the redox reaction:

    2HI + H2SO4 -- > I2 + SO2 +2H20?

    I don't get the next step what happens after. Something about it reacting with SO2?
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    How would I name this?
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    (Original post by Kadak)
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    How would I name this?
    3-ethylpentan-3-ol
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    (Original post by ThatGuyRik)
    3-ethylpentan-3-ol


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    Where does the 3 come from?
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    (Original post by Kadak)
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    Where does the 3 come from?
    Where the ethyl and alcohol groups are situated on the carbon chain.
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    Need help with question 1

    Is BF3 - Trigonal planar as it has 3 electrons in it's outer shell and each flourine bring one. Which makes the angle 120 degrees.

    I said that BF4- would be tetrahedral. The boron has gained an electron so now it has got 4 electrons around it's outer shell with the addition of four more from the flourine. No lone pairs so 109.5 degrees.

    Not too sure on b. Like normally the answer to these questions are dative covalent bond. Which means I have misunderstood something about the ion.

    Thanks
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    Hi has anyone done the ocr chemistry A quantitative on enthalpy it my only and last chance to get a decent grade, so if i could get some hints and tips that would be very much nice of anyone
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    (Original post by erfanullah)
    Hi has anyone done the ocr chemistry A quantitative on enthalpy it my only and last chance to get a decent grade, so if i could get some hints and tips that would be very much nice of anyone
    Are you sure it's quantitative? I've done the evaluative on enthalpy.

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    (Original post by HAnwar)
    Are you sure it's quantitative? I've done the evaluative on enthalpy.

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    Yeah im sure bro
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    (Original post by erfanullah)
    Yeah im sure bro
    Hmm don't know then, sorry.

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    Anyone done JANUARY 2010 f322 ocr? Question 6g..... How can you tell using the mass spectrum whether the alcohol is propan-1-ol or propan-2-ol? surely they wouldn't show up as any different because a CH3+ fragment ion can form for both of them? Please helppppppp


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    (Original post by anoymous1111)
    Anyone done JANUARY 2010 f322 ocr? Question 6g..... How can you tell using the mass spectrum whether the alcohol is propan-1-ol or propan-2-ol? surely they wouldn't show up as any different because a CH3+ fragment ion can form for both of them? Please helppppppp
    Propan-1-ol is a primary alcohol, whereas Propan-2-ol is a secondary alcohol. By identifying the organic product F produced via the oxidation of substance E using the infrared spectroscopy given to you, you can determine what type of alcohol E is, and so choose between the two.

    This is because primary alcohols produce a different organic compound to secondary alcohols when oxidised in the presence of acified potassium dichromate. Primary alcohols produce aldehydes and then carboxylic acids, but secondary alcohols produce ketones.
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    (Original post by lukejoshjames)
    Propan-1-ol is a primary alcohol, whereas Propan-2-ol is a secondary alcohol. By identifying the organic product F produced via the oxidation of substance E using the infrared spectroscopy given to you, you can determine what type of alcohol E is, and so choose between the two.

    This is because primary alcohols produce a different organic compound to secondary alcohols when oxidised in the presence of acified potassium dichromate. Primary alcohols produce aldehydes and then carboxylic acids, but secondary alcohols produce ketones.
    Thank you so much! Is that the only way you could distinguish between them? there's no way you would know without the infrared spectrum shown?


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    (Original post by anoymous1111)
    Thank you so much! Is that the only way you could distinguish between them? there's no way you would know without the infrared spectrum shown?


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    I'm pretty sure there's no way, but I may be wrong.
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    Posted from TSR Mobile

    Need help and guidance on how O would work this put.Please help.
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