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    can some one help me, also what did you guys right about question 4 paper 1 about when it was asking about when its the end time, i think i got it wrong -_- what was the proper answer
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    For the one where it asked about the end time for diffusion being difficult I said that towards the end it is hard to see the exact point it changes, and the same person each time should decide if it has reached the end time so it is consistent. What do you need help with?
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    (Original post by Polapod)
    For the one where it asked about the end time for diffusion being difficult I said that towards the end it is hard to see the exact point it changes, and the same person each time should decide if it has reached the end time so it is consistent. What do you need help with?
    paper 2
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    (Original post by haemo)
    AQA?
    yes
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    If this is about the agar cube thing with phenothalin (just the experiment we did at out school - think the factor we were investigating was surface area) I think I put something about how it could lead to errors as it would be hard to determine the end time as different people would determine the end point and different amounts of pink, I'm sorry if that doesn't really help I did this last year :P
 
 
 
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