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    (Original post by Dylann)
    It's not really a "Chemistry" challenge as much as it is "How good are you Google skills" challenge
    :lol:

    True but it does prep you up for the C3L6 paper in June
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    (Original post by zhang-liao)
    :lol:

    True but it does prep you up for the C3L6 paper in June
    It really doesn't though! I'm pretty sure the online challenge content is way more advanced than the paper content (which is actually loosely based on AS content!)


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    (Original post by danconway)
    It really doesn't though! I'm pretty sure the online challenge content is way more advanced than the paper content (which is actually loosely based on AS content!)


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    It is a bit more advanced than the paper but not waaay more advanced.
    Have you checked out the papers available online yet?
    Some of the questions are simply content you learn at AS but other questions are more complicated though.

    I feel like you're all ganging up on me for suggesting the online challenge
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    (Original post by zhang-liao)
    It is a bit more advanced than the paper but not waaay more advanced.
    Have you checked out the papers available online yet?
    Some of the questions are simply content you learn at AS but other questions are more complicated though.

    I feel like you're all ganging up on me for suggesting the online challenge
    Ahaha of course not- I love the online challenge! But I could never really see any of those questions being in the real test paper (I've looked at some of the written paper questions). On the online challenge, I've seen questions on standard electrode potentials!


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    (Original post by danconway)
    Ahaha of course not- I love the online challenge! But I could never really see any of those questions being in the real test paper (I've looked at some of the written paper questions). On the online challenge, I've seen questions on standard electrode potentials!


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    The online challenge is harder than the paper but you do have Google to help though. The paper is still kinda difficult
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    (Original post by danconway)
    Probably!

    Welcome anyway, funny Northern Irish board person

    Also I'm just going to put this out there. CCEA exam papers are aesthetically hideous. :P
    Why thank you, it's an honour to be here funny... Chiswick person :P

    and i would agree with you, but the papers do grow on you after a couple of years.
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    Does anyone here do edexcel? What are you guys averaging on papers?
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    hi who knows the answer to this and how do you work it out?

    1. 12 What is the total number of atoms in 1.8 g of water, H2O?



    [IMG]file:///page5image21232[/IMG][IMG]file:///page5image25072[/IMG] DATA
    x The molar mass of H20 is 18mol-1
    x The Avogadro Constant is 6.0 × 1023 mol–1

    1. A 6.0 × 1022
    2. B 6.0 × 1023
    3. C 1.8 × 1023
    4. D 1.8 × 1024

      thanks

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    Hey anyone doing AQA here? Polar and dipole stuff is so confusing and weird, probably the only hard part so far in chemistry.
    Well apart from limiting reagents, does anyone have any tips for doing those types of questions like a method or something?
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    (Original post by ilovecake123)
    hi who knows the answer to this and how do you work it out?

    1. 12 What is the total number of atoms in 1.8 g of water, H2O?



    [IMG]file:///page5image21232[/IMG][IMG]file:///page5image25072[/IMG] DATA
    x The molar mass of H20 is 18mol-1
    x The Avogadro Constant is 6.0 × 1023 mol–1

    1. A 6.0 × 1022
    2. B 6.0 × 1023
    3. C 1.8 × 1023
    4. D 1.8 × 1024

      thanks
    ((1.8/18)x6x10^23)x3

    So C
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    (Original post by BBeyond)
    ((1.8/18)x6x10^23)x3

    So C
    I helped someone with this exact question about 4 pages ago... seems to be particularly troublesome for people :/
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    (Original post by BBeyond)
    ((1.8/18)x6x10^23)x3

    So C
    thanks
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    (Original post by zhang-liao)
    The online challenge is harder than the paper but you do have Google to help though. The paper is still kinda difficult
    From what I've seen stalking stalking pages quite a few tsrians get like silver so I think it'll be fairly challenging but not ridiculous or anything like that

    does doing the weekly challenge aid performance in the end of year test?

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    (Original post by danconway)
    I helped someone with this exact question about 4 pages ago... seems to be particularly troublesome for people :/
    Yeah I guess people haven't been taught how to distinguish between when they ask for number of molecules and atoms in these sort of questions
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    How do you do this one?

    16 3.0 dm3 of sulfur dioxide reacts with 1.5 dm3 of oxygen, under suitable conditions,according to the equation below.
    2SO2(g) + O2(g) o 2SO3(g)
    What is the maximum volume of sulfur trioxide that can be formed in the above

    reaction?
    [The volumes of the gases are measured at the same temperature and pressure.]



    [IMG]file:///page7image4640[/IMG]
    1. A 6.0 dm3
    2. B 4.5 dm3
    3. C 3.0 dm3
    4. D 1.5 dm3
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    (Original post by ilovecake123)
    How do you do this one?

    16 3.0 dm3 of sulfur dioxide reacts with 1.5 dm3 of oxygen, under suitable conditions,according to the equation below.
    2SO2(g) + O2(g) o 2SO3(g)
    What is the maximum volume of sulfur trioxide that can be formed in the above

    reaction?
    [The volumes of the gases are measured at the same temperature and pressure.]



    [IMG]file:///page7image4640[/IMG]
    1. A 6.0 dm3
    2. B 4.5 dm3
    3. C 3.0 dm3
    4. D 1.5 dm3
    Work out how many moles of each there are.
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    (Original post by danconway)
    Work out how many moles of each there are.
    then?
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    (Original post by lyricalvibe)
    From what I've seen stalking stalking pages quite a few tsrians get like silver so I think it'll be fairly challenging but not ridiculous or anything like that

    does doing the weekly challenge aid performance in the end of year test?

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    Not weekly..monthly

    It helps prep so I guess so
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    (Original post by ilovecake123)
    then?
    Work out the volume of gas :P

    So (a) what is the moleage (I made that up ) of 1.5 dm3 of O2
    Spoiler:
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    0.0625 mol

    (b) How many moles are there in 3 dm3 of SO2
    Spoiler:
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    0.125 mol

    (c) Is one of them in excess or is it in the right proportion (use mole ratio)
    Spoiler:
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    they're in the right proportion, so 0.0625 mol of O2 reacts with 0.125 of SO2

    (d) How many moles of SO3 are produced?
    Spoiler:
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    0.125 mol

    (e) How much gas is that?
    Spoiler:
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    0.125 x 24 = 3 dm3
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    (Original post by danconway)
    Work out the volume of gas :P

    So (a) what is the moleage (I made that up ) of 1.5 dm3 of O2
    (b) How many moles are there in 3 dm3 of SO2
    (c) Is one of them in excess or is it in the right proportion (use mole ratio)
    (d) How many moles of SO3 are produced?
    (e) How much gas is that?
    so the moles of o2 is 1.5/24? = 0.0625
    b) so2 = 3/24 =0.125
    c) how do you use the mole ratio?
 
 
 
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