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    i wrote the value of combustion of c2 sth 1200 and i didnot write the sign will they remove the mark and even in the table i did not write the sign
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    (Original post by AlonsoAMG)
    wouldn't mass give a large uncertainty since it was rounded to the nearest 100g tho?
    Isn't uncertainties to do with the measuring instruments used? So if a balance was used I'm pretty sure it would not give you the value to the nearest 100g! Usually it's like 0.01g uncertainty for mass.
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    BTW whoever is doing physics have any good advice for unit 3
    ??
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    Guys to test for the iodine is it correct to use starch and it'll turn blue-black??????
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    I'm getting around 40-44 marks what about u all??
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    (Original post by I <3 WORK)
    Hmm yet again I think that's rather debatable. Like you say I think it just depends on our luck and the mark scheme! :/ I've a feeling that reflux will need to be stated though.
    yeah same, but i'm in denial haha :') Oh well, can't change anything now.
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    (Original post by Ahmed3651998)
    I'm getting around 40-44 marks what about u all??
    Ahmed? From minecraft?
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    (Original post by Hiyoriiki)
    -1200
    i wrote 1200
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    (Original post by Blazyy)
    Ahmed? From minecraft?
    nope?
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    (Original post by don't cry-craft)
    Hey you might still get a mark since it was like 2 marks.
    I know but still.I've already lost like 5 marks in the first question.Water test,Carbonate ion,Due to which wrong equation.
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    (Original post by Ahmed3651998)
    nope?
    Sorry, I had a friend in minecraft back in the days with a name that's almost same as yours
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    (Original post by don't cry-craft)
    yeah same, but i'm in denial haha :' Oh well, can't change anything now.
    well in the markscheme it's usually Relux/Heat so I think you'll be fine
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    (Original post by don't cry-craft)
    Isn't uncertainties to do with the measuring instruments used? So if a balance was used I'm pretty sure it would not give you the value to the nearest 100g! Usually it's like 0.01g uncertainty for mass.
    true but in part a it says:
    mass of coper cup: 300g
    mass of coper cup + water: 700g

    which is rounded to nearest 100g
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    (Original post by AlonsoAMG)
    true but in part a it says:
    mass of coper cup: 300g
    mass of coper cup + water: 700g

    which is rounded to nearest 100g
    I think it was mentioned as 300.00 and 400.00
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    (Original post by OnTheHorizon)
    well in the markscheme it's usually Relux/Heat so I think you'll be fine
    i wrote 1200 i didnot write the sign and in the graph i forgot the sign will i lose any mark
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    (Original post by OnTheHorizon)
    I know but still.I've already lost like 5 marks in the first question.Water test,Carbonate ion,Due to which wrong equation.
    I feel like many of us messed up the carbonate ion (and therefore the equation) - I mean I did. Don't worry, hopefully the grade boundaries won't be too high. Good luck with your other exams ))
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    (Original post by OnTheHorizon)
    well in the markscheme it's usually Relux/Heat so I think you'll be fine
    Hopefully *fingers crossed*. Also losing 5 marks is fine! You can do better in unit 2
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    Yea thats correct I guess because I got -418Kjmol-1 aswell
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    (Original post by ToxicPhantom007)
    1st, 2nd were not valid because rounding off doesnt give a huge difference. Heat loss and incomplete comb were the valid statements
    But the heat loss will make it less exothermic not more exothermic - so it won't be valid?
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    (Original post by don't cry-craft)
    Hopefully *fingers crossed*. Also losing 5 marks is fine! You can do better in unit 2
    i wrote 1200 omitting the sign will i lose the mark and in the graph i forgot the sign
 
 
 
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