# AQA AS Chemistry 7404/1 and 7404/2 - 27th May 2016 and 10th June 2016Watch

2 years ago
#801
(Original post by Turtlebunny)
No, you are definitely not the only one! Plenty of people in my college found it hard, and we have a strong chemistry department, teachers and students. Don't worry too much about it
Okay that makes me feel a little better haha
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2 years ago
#802
(Original post by GabbytheGreek_48)
i think will either b about the same or slightly go down
An A and a B will definitely go down I think. C will probably stay the same(ish) and the D/E will go up.
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2 years ago
#803
(Original post by Tim73)
Okay that makes me feel a little better haha
No worries We'll just wait and see, it's over now, both exams and all of AS chemistry, best you can do is focus on your other subjects
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2 years ago
#804
The volume of hydrogen rate of reaction slacking. Was it lower volume of hydrogen and faster initial rate or was it slower?

Posted from TSR Mobile
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2 years ago
#805
1) convert mg into g (218/1000)
2)divide the mass by the mr (0.218/24.3)
3) this gives you the moles of 0.0726
4) divide the moles of hydrogen by 2 due to the 1:2 ratio between magnesium and hydrogen (cant remember moles)
5) comparing the moles of magnesium to the moles of hydrogen there is more magnesium so it is in excess.
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2 years ago
#806
(Original post by DaVinciGirl)
The volume of hydrogen rate of reaction slacking. Was it lower volume of hydrogen and faster initial rate or was it slower?

Posted from TSR Mobile
i plugged in some calculations, it was both a slower rate of reaction and it was exactly one square lower in terms of the final plateau
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2 years ago
#807
(Original post by matte17)
1) convert mg into g (218/1000)
2)divide the mass by the mr (0.218/24.3)
3) this gives you the moles of 0.0726
4) divide the moles of hydrogen by 2 due to the 1:2 ratio between magnesium and hydrogen (cant remember moles)
5) comparing the moles of magnesium to the moles of hydrogen there is more magnesium so it is in excess.
it was 396 milligrams btw
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2 years ago
#808
The timing was a real issue, the exam was over as soon as I answered the last question
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2 years ago
#809
Does anyone know if we still get ums after the new a level reform??

(i think i messed this paper up )
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2 years ago
#810
(Original post by Splaffie)
i plugged in some calculations, it was both a slower rate of reaction and it was exactly one square lower in terms of the final plateau
Was it a reversible reaction?
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2 years ago
#811
(Original post by Splaffie)
it was 396 milligrams btw
*396 ~ cheers btw
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2 years ago
#812
(Original post by Splaffie)
i plugged in some calculations, it was both a slower rate of reaction and it was exactly one square lower in terms of the final plateau
I think it was faster rate of reaction, as concentration ethanoic acid is greater in 2nd experiment.
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2 years ago
#813
(Original post by zigocarn)
Was it a reversible reaction?
no, why would it be?
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2 years ago
#814
(Original post by DaVinciGirl)
The volume of hydrogen rate of reaction slacking. Was it lower volume of hydrogen and faster initial rate or was it slower?

Posted from TSR Mobile
I can't remember the question exactly but I drew a faster initial rate and a lower volume
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2 years ago
#815
(Original post by Splaffie)
no, why would it be?
haha I can't even remember the question properly.
I though it said a smaller vol, therefore higher pressure > fast initial rate of reaction. And there was an increase in the conc, so higher vol H2 produced?
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2 years ago
#816
How many days till teachers get markschmee
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2 years ago
#817
(Original post by pandasandpens)
Does anyone know if we still get ums after the new a level reform??

(i think i messed this paper up )
We dont get UMS for the new reformed A levels.
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2 years ago
#818
(Original post by zigocarn)
haha I can't even remember the question properly.
I though it said a smaller vol, therefore higher pressure > fast initial rate of reaction. And there was an increase in the conc, so higher vol H2 produced?
wasnt it a reduction in concentration?
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2 years ago
#819
(Original post by Pentaquark)
We dont get UMS for the new reformed A levels.
What? What avout our score
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2 years ago
#820
(Original post by Splaffie)
wasnt it a reduction in concentration?
I thought it was an increase in concentration.
You're probably right I guess.
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