OCR A-Level Chemistry B Paper 1 (H433/01) - 12th June 2023 [Exam Chat]

gwall3r2005

for yield i think i got 80% i did moles of the product whatever it was over moles of the reactant
for the naoh one i cant remember but something like 0.02? u had to use kw = conc h+ x conc oh-

I agree with both numbers but for yield it’s (experimental yield (given in Q) / theoretical yield (calculated from the calculated mol of reactant)) * 100. It gave around 79% I think.

Reply 41

Phoebesophiaaaa

1

Original post by gwall3r2005

I think it was using the healthy blood pH and the salt:acid ratio to calculate the Ka of the acid.
Then use this Ka in a separate equation for the acidosis blood and that pHto calculate the salt:acid ratio :smile:

Yes that's what I did too, I got a value of 7.13 couple of my friends did too

Reply 42

AA55

5

Original post by gwall3r2005

I think it was using the healthy blood pH and the salt:acid ratio to calculate the Ka of the acid.
Then use this Ka in a separate equation for the acidosis blood and that pH to calculate the salt:acid ratio :smile:

ahh thats so smart

Reply 43

sy.lv.ie

1

Original post by Sophiew004

Did anyone else find the multiple choice really hard

Yes it was so hard

Reply 44

bioneekloool

Original post by choco1234

i got 8% for the iron :/ how did u do it?

u had to find the moles of mn04 by doing n = c x v / 1000

then multiplying by 5 as mn04 to fe2+ was a 1:5 ratio

then doing mass = moles x mr to get the mass of iron in the alloy

mass of iron / mass of alloy x 100 to get the %

for the mass of iron i got 1.16g to give around 17 %

Reply 45

5hyl33n

OP

Volunteer Team, Clearing and Applications Advisor

21

Hello everyone,

Well done on finishing your first A-Level Chemistry paper.

After briefly scanning through the posts, it appears that the exam did not yield the desired outcomes for some individuals. It is understandable that your immediate response might be to feel overwhelmed and contemplate giving up. However, I urge you not to do this. Remember, you have only completed one paper, and you still have two more opportunities to improve your score. The grade thresholds will be adjusted to account for the paper's difficulty, and it is possible that your performance surpassed your expectations.

Now, try to stop thinking about the paper. If you’ve been revising for your other examinations, take a two hour break. Do something relaxing. If you’ve been procrastinating your other examinations, do an hour or two of work. If you haven’t been eating properly, make yourself a meal. If you haven’t been sleeping properly, have an early night.

Posting has been a bit slow for me over the last two months, but I should be back on the weekend. If you are still feeling overwhelmed or need some advice, drop me a message and I’ll try my best to assist you.

Regardless of the outcome of this paper, you should take pride in your accomplishments. Your educational journey has faced numerous disruptions due to the impact of Covid, making it brilliant that you have persevered despite the challenging circumstances.

Shyleen

(edited 10 months ago)

Reply 46

Amethystic

7

Original post by hello83

does anyone have ant predicted questions for the paper 2 article?