OCR Chemistry A 2016 unofficial mark scheme 27/05/16

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Paper 2 is going to be ALOT harder for sure, or else grade boundaries will be very low I think. They could have made it so much more difficult.

Reply 161

Bosssman

Suggestions for predicted content in Depth paper?
All I have currently is definitely IR and mass spec

Reply 162

BenAtkinson

Original post by Bosssman

Suggestions for predicted content in Depth paper?
All I have currently is definitely IR and mass spec

Im guessing 12 marker on EF, mass spec and IR aswell.. Also I think they'll do a hydrolysis mechanism and a big question on ionisation trends. Boltzmann distribution also will come up Im pretty sure

Reply 163

connorhill

Original post by jadeemma

I got -19.5 ... Didn't you have to times the number of moles by three?

That's what I got, a lot of people have said 58 thought but hopefully we are right

Reply 164

sandralewis

you don't times by 3 as ki was in "excess" you only calculate the moles of the limiting factor.

Reply 165

ronnydandam

I think I got around 58 on that paper. What do you think is needed for an A?

Reply 166

Rainbowsausage01

Does anyone remember the MCQ's?

Reply 167

Rainbowsausage01

What do you guys think the grade boundaries are going to be like?

Reply 168

simply_a_ Δ

If you write under the lines but within the margin, is it ok?
This was a nice paper but I still did crap - I counted about 40 to 45 mark. Having reviewed the MC unofficial markscheme, I screwed them up

Reply 169

Rainbowsausage01

Original post by simply_a_ Δ

I am not sure about writing under the lines but I do know they gave a lined sheet at the end for extra writing where you had to clearly lable the question.

Reply 170

jenni:)

I always write under the lines, I hope it's okay, I think it is bc there's nothing to say you can't

Posted from TSR Mobile

Reply 171

Mudas

Got 57 which is either a high b or a low a. On last years boundaries that would be an A but on one of the tougher yars that would be a high b. We will have to wait and see! Btw, for the q regarding how you could decrease the % error, could U say that you could use a measuring device with a greater precision i.e less than 0.005. It is technically correct but would OCR accept this?

Reply 172

Bethanwaller

Original post by simply_a_ Δ

Me too!! seeing the unofficial mark scheme has really put a doubt in my mind on how well ive done

Reply 173

Sthomson99

Do you think the last answer would accept Mg(OH)2 as a reagent?

Reply 174

ineedA

Original post by X_IDE_sidf

Concentration in equilibrium question: 0.876 moldm^-3

I never got that I don't think

K_c = \frac{|SO_3|^2}{|2|^2|1.6|}

cannot remember

K_c

KC was 0.16 not sure if this is too late or not

Reply 175

banterboy098

what grade would be 44 marks?

Reply 176

4nonymous

Original post by BenAtkinson

Im guessing 12 marker on EF, mass spec and IR aswell.. Also I think they'll do a hydrolysis mechanism and a big question on ionisation trends. Boltzmann distribution also will come up Im pretty sure

Pv=nRT
Also definitions

Reply 177

theguywhosaidhi

71% at 50 marks so hopefully a B which I will take 1000000000000% because I got an E in my latest mocks running up to the exam!

that's assuming 15/20 on multiple choice because I thought it was pretty easy but probably made some silly errors as per usual :h:

Reply 178

banterboy098

Original post by theguywhosaidhi

so 44 would be a high c?

Reply 179

KulawiT

It was a decent paper next one will be hard though. I have a few questions:

1. My calculator gave me 3.97x10^22 instead of 3.98 will i lose a mark?

2. I said use a higher resolution top pan balance to reduce percentage error which it actually does?

3. I said heat again until mass does not change. is this enough detail?

4. I got 3.33 for the conc. of KI will they accept this?

5. I USED 3+ INSTEAD OF +3, DO THEY MARK DOWN FOR THIS?

sorry for the questions but a bit worried.