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OCR AS Chemistry [Breadth] Mon 20th May Unofficial markscheme

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Original post by Stressednob

I got 0.309

Ok good thats probably what i got too

Sure??

For the mean titre one did anyone get 24.10?

24.25

Original post by swirlingseas

For the mean titre one did anyone get 24.10?

Original post by swirlingseas

For the mean titre one did anyone get 24.10?

I got 23.25 or 24.25

you had to use the concordant results only

Hi

i did so bad on this question

Ye I got 24.25 I think

Original post by grebnesieH

I got 23.25 or 24.25

you had to use the concordant results only

Original post by Quitebad124

Ye I got 24.25 I think

ok good

I got 10cm3 for volume cos oxygen was excess so 2 didn't react and it formed 8bso 10

And 0.309 on that concentration one?

Original post by grebnesieH

ok good

Yeah I got that

Original post by Quitebad124

And 0.309 on that concentration one?

I got 12 but I didn’t think it was right

Original post by thekidwhogames

I got 10cm3 for volume cos oxygen was excess so 2 didn't react and it formed 8bso 10

I got 12

Original post by thekidwhogames

I got 10cm3 for volume cos oxygen was excess so 2 didn't react and it formed 8bso 10

Why is it not 10? By molar ratios 8 produces of gas but oxygen was in excess

Original post by Quitebad124

And 0.309 on that concentration one?

Yep i got that too. The last one was C4H4Cl6 ?

I thought there were less moles of O2 so it wasn’t excess the other was want it

Original post by thekidwhogames

Why is it not 10? By molar ratios 8 produces of gas but oxygen was in excess

yeah that's what I did too
at first i just added them to get 14cm3, then i realised

Original post by thekidwhogames

I got 10cm3 for volume cos oxygen was excess so 2 didn't react and it formed 8bso 10

Ye that’s what I got

Original post by grebnesieH

Yep i got that too. The last one was C4H4Cl6 ?

I don’t remember but i am not sure if oxygen was in excess

Original post by Quitebad124

I thought there were less moles of O2 so it wasn’t excess the other was want it

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