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

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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 :smile:

Okay that makes me feel a little better haha

Reply 801

Turtlebunny

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.

Reply 802

Turtlebunny

Original post by Tim73

Okay that makes me feel a little better haha

No worries :smile:

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 :smile:

Reply 803

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

Reply 804

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.

Reply 805

Splaffie

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

Reply 806

Splaffie

Original post by matte17

it was 396 milligrams btw

Reply 807

raiba

The timing was a real issue, the exam was over as soon as I answered the last question

Reply 808

pandasandpens

Does anyone know if we still get ums after the new a level reform??

(i think i messed this paper up

)

Reply 809

zigocarn

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?

Reply 810

matte17

Original post by Splaffie

it was 396 milligrams btw

*396 ~ cheers btw

Reply 811

vignesh1234567

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.

Reply 812

Splaffie

Original post by zigocarn

Was it a reversible reaction?

no, why would it be?

Reply 813

haes

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

Reply 814

zigocarn

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?