_s_ox
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In the Unit 1 June 2012 paper, question 4 says calculate the rate of uptake of sodium ions and from the graph it really obviously looks like 4/30, but the mark scheme says 6/30. Am I being stupid or is there something wrong with the mark scheme?


http://filestore.aqa.org.uk/subjects...W-MS-JUN12.PDF

http://filestore.aqa.org.uk/subjects...1-QP-JUN12.PDF
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TammyIce
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(Original post by _s_ox)
In the Unit 1 June 2012 paper, question 4 says calculate the rate of uptake of sodium ions and from the graph it really obviously looks like 4/30, but the mark scheme says 6/30. Am I being stupid or is there something wrong with the mark scheme?


http://filestore.aqa.org.uk/subjects...W-MS-JUN12.PDF

http://filestore.aqa.org.uk/subjects...1-QP-JUN12.PDF
It asked for rate of uptake, so you have to do the difference divided by time rather than just the point at 30 mins . Sodium ions start at 10: 10 - 4 = 6. Hope that helps
And then 6/30
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