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

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Original post by swirlingseas

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

10 yh?

yeah

Original post by thekidwhogames

10 yh?

Original post by Stressednob

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

I think it was? It was 1 to 2 ratio and nitrogen or something was 8 but oxygen 6 which is in excess by 2

I thought we only had to find the mass I didn’t write the formula but mass was like 259 or something how much marks do you think I’d lose

Original post by Quitebad124

Ye that’s what I got

Original post by Quitebad124

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

Original post by grebnesieH

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

would the grade boundaries be higher than last year?

It was only a two market so just one mark lost

Original post by Stressednob

I thought we only had to find the mass I didn’t write the formula but mass was like 259 or something how much marks do you think I’d lose

Original post by Stressednob

I thought we only had to find the mass I didn’t write the formula but mass was like 259 or something how much marks do you think I’d lose

you'd lose one for not calculating Mr and one for not working out the formula probably

Do u guys think the grade boundaries will be higher than last year?

(edited 4 years ago)

Yeah but I you had found the mass using volume the answer would be other way around

Original post by thekidwhogames

I think it was? It was 1 to 2 ratio and nitrogen or something was 8 but oxygen 6 which is in excess by 2

Hop not and I don’t think they will

Original post by wefdsf

would the grade boundaries be higher than last year?

Original post by wefdsf

Would the grade boundaries be higher than last year?

I liked last year's one more so maybe lower but idk. It was 55/70 for an A in last year's one.

What were they last year?

Original post by wefdsf

Do u guys think the grade boundaries will be higher than last year?

I don't get it

Ratio of 1 to 2

8 to 4

Bjr u had 6 oxygen
2 excess

8 mole of product

10 dm3 total

Original post by Quitebad124

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

How did you do the N₂O diagram??

It was 55marks for an A in breadth

Original post by swirlingseas

What were they last year?

Did anyone find the dot and cross of N2O confusing? It was triple bond N, single bond O but it made no sense to me because it left central N only bonding 4 of its electrons

Dative covalent for one of the nitrogen oxygen bonds

Original post by grebnesieH

How did you do the N₂O diagram??

What did u guy fleet when it said form an equation where all the H had beeen substituted with Cl. And the other form an equation question

Original post by Quitebad124

Dative covalent for one of the nitrogen oxygen bonds

Yes I think thats right. I just searched it up and there are 2 different ways to do it.

You can have a triple N to N bond plus one dative N to O bond, or you can do a N=O bond and N-N bond plus a N->N bond.

I think i put C4H10 +5cl2 ———C4Cl10 + 5H2

Original post by ModdyNeon

What did u guy fleet when it said form an equation where all the H had beeen substituted with Cl. And the other form an equation question

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