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OCR Chemistry F322~ 4th June 2013~ AS Chemistry Watch

  • View Poll Results: How did you find the exam
    Hard A= 72
    42
    15.22%
    It was okay A= 76
    99
    35.87%
    Easy A= 79
    75
    27.17%
    Very Easy A=82
    60
    21.74%

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    (Original post by needtosucceed=))
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    That means you've repeated some of them. Name them all so you know which one you've done more than once what's the formula I'll post a picture up of the ones you should have?
    its C5H12 , I know its quite simple and I thought I knew it but its annoying when you dont get the same answers as the book sometimes
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    Really not looking forward to chemistry! Having dedicated the majority of this weekend to biology ill be doing chemistry straight after my biology exam on Monday


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    just got 94/100 in the jan 2013 paper made so many silly mistakes LOL
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    (Original post by That_Clever_Guy)
    just got 94/100 in the jan 2013 paper made so many silly mistakes LOL
    By so many you mean 6?


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    (Original post by ImAz)
    By so many you mean 6?


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    he lost 6 marks not 6 mistakes.
    by so many he means like 3 (about 2 marks each questions.)
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    (Original post by ImAz)
    By so many you mean 6?


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    Nah im exaggerating made like one silly mistake by not reading the question properly and the rest i couldn't do and that silly mistake was on enthalpy and lost three marks LOOL


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    (Original post by needtosucceed=))
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    It gets 10x worse at a2. When you get to this time next year you'll realise how easy AS actually is F214 is actually pretty good but F215s a b****
    You're making me consider picking physics for A2 so I can drop biology
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    Would anyone of you guys like a scan of F322 definitions that my college has produced?
    Or are you already sorted?
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    (Original post by Gotzz)
    You're making me consider picking physics for A2 so I can drop biology
    Ahh I've heard physics is even worse, stick with biology
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    Jan 2013, question 2b.
    Why is it reactants minus products?? How you do this, men

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    (Original post by needtosucceed=))
    Ahh I've heard physics is even worse, stick with biology
    Yeah, I guess I'll have to
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    (Original post by ss2012)
    its C5H12 , I know its quite simple and I thought I knew it but its annoying when you dont get the same answers as the book sometimes
    From the top of my head these are the possibilities
    Pentane
    2-methylbutane
    2,2-dimethylpropane
    1,2-dimethylpropane

    Did you get those 4?what other ones did you get?
    Start with the straight chained one then branch it once (add a methyl) then branch it twice if possible. First add the 2 methyl groups on different carbons then on the same carbon. Name them all to make sure you haven't drawn the same thing twice.
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    (Original post by ImAz)
    Really not looking forward to chemistry! Having dedicated the majority of this weekend to biology ill be doing chemistry straight after my biology exam on Monday


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    Only half the weekends gone so far, you've still got time
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    (Original post by Gotzz)
    Yeah, I guess I'll have to
    As long as you stay on top of things is alright. The content is definitely a fair bit harder so if you don't understand something sort it out at the time rather than leaving it till may
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    (Original post by needtosucceed=))
    As long as you stay on top of things is alright. The content is definitely a fair bit harder so if you don't understand something sort it out at the time rather than leaving it till may
    Thanks for the advice
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    (Original post by reubenkinara)
    Would anyone of you guys like a scan of F322 definitions that my college has produced?
    Or are you already sorted?
    Yes please
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    Can anybody explain question 3d) to me on the June 2012 paper please?

    It's about percentage yield but I can't figure out how they got the numbers in the mark scheme, thanks.
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    (Original post by dawg)
    Can anybody explain question 3d) to me on the June 2012 paper please?

    It's about percentage yield but I can't figure out how they got the numbers in the mark scheme, thanks.
    im on my phone so i havent seen the question but remember that you have to use the number of moles to work out percentage yield allot of people reckon that you use the mass but thats wrong hope that helps
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    (Original post by dawg)
    Can anybody explain question 3d) to me on the June 2012 paper please?

    It's about percentage yield but I can't figure out how they got the numbers in the mark scheme, thanks.


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    I haven't seen the question but as far as I remember look at the molar ratio in the equation they give you. I think it's 3:1? Multiply either the reactants or products by 3 to scale it up to make it a one to one ratio.Then its just the normal actual /theoretical x100
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    You use, more collisions per second for higher pressure, and more successful collisions for higher temperature or use of a catalyst. Is this correct?
 
 
 
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