OCR A Level Chemistry Paper 1 H432/01 - 13th Jun 2022 [Exam Chat]

Chemistry is so hard This paper is really worrying me!
What do you think the grade boundaries will be like?

Chemistry is so hard This paper is really worrying me!
What do you think the grade boundaries will be like?

Which topics/questions are you struggling with?

hi guys! if u have any questions about physical chemistry let me know and i'll try my best to explain

what resources/sites/books etc are you all using to revise, make notes etc

ARRHENUIS!!! I hate the arrhenuis equation, I don't understand it and it feels like i never will at this point. It's really hard to find past paper questions just testing arrhenuis and even then i get an insanely wrong answer. If you can, pls can you explain this dire equation. I hate it to the core. I think the thing I did most was that I'd rearrange the equation, and get the wrong answer, so I would most likely have arranged it wrong.

i use chemguide, pearson textbook, save my exams and CGP to make notes on notion. I make notes with CGP/save my exams, then read over the more detailed books and add any missing bits.

the arrhenius equation shows how the rate constant changes when you change temperature

k = Ae ^ -Ea/RT

k= rate constant
Ea= activation energy
T = temperature
R = gas constant, 8.314
A = pre exponential factor

e^ -Ea/RT represents the fraction of collisions that have met or exceeded the activation energy

an easier form of the equation, which is likely the one you'll use in the exam, is :
lnk = lnA - Ea/RT

we can relate it to a graph in this way:
y= c + mx , where lnA is the y intercept, and -Ea/R is m, the gradient

in exams, a high mark question on this usually goes like this:
1. you are given a table of values to complete, eg. you have k and you need to calculate lnk or 1/T
2. plot the graph of lnk on the y axis, and 1/T on the x axis
3. now they'll probably ask you to calculate activation energy. In this case, all u need is the fact that the gradient of the graph u plotted is -Ea/R
if u find the gradient eg. if it's -6000, then -6000= -Ea/8.314 , so u can rearrange to then find Ea in Jmol-1, then divide if u need the answer in kJmol-1
4. if they ask u for lnA, that is the y intercept
5. if they ask u for A, A= e^lnA so just put e in ur calculator to the power of lnA

hope this helps! lmk if I made any mistakes as I am also in y13 :')

is save my exams any good? ive been thinking of it but you can't seem to get the mark schemes without paying for it, and because considering paying for a premium snap revise account I wasn't so sure which to choose

is save my exams any good? ive been thinking of it but you can't seem to get the mark schemes without paying for it, and because considering paying for a premium snap revise account I wasn't so sure which to choose

Exam technique, night before breakdowns and discussion regarding this exam... This is the place to be

Feel free to chat about your exam, add resources to the thread as well as anything that may be helpful to others

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Chemistry is so hard This paper is really worrying me!
What do you think the grade boundaries will be like?

it won’t be 80% for an A 😭 they’ve said grade boundaries will be lower than 2019