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OCR GCSE Chemistry Paper 4 (Higher tier) J248/04 - 20 Jun 2022 [Exam Chat]

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OCR GCSE Chemistry Paper 4 (Higher tier) J248/04 - 20 Jun 2022 [Exam Chat]


Here is the exam discussion for this exam. Talk anything from how to revise for it, specific questions or time management :ahee:

Date/Time: Monday 20th June AM
Length: 1h45


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:goodluck: with revision and exams :work:
(edited 1 year ago)

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How was the exam?
What did everyone get for the maths style questions?
Original post by Mythical Pingu
How was the exam?


Ughhh soo bad
Original post by Elle6363
Ughhh soo bad

Do you wanna compare answers?
Original post by bunsenburner92
Do you wanna compare answers?


Sureee , let’s do an answer dump
For the hydrogen fuel advantage and disadvantage one what’d everyone get
For the maths I got
102dm3
3.92g
91%
0.049mol/dm3
Are you guys doing the answer dump here?
Original post by Pirameister
Are you guys doing the answer dump here?


Yeap
Original post by Pirameister
For the hydrogen fuel advantage and disadvantage one what’d everyone get
For the maths I got
102dm3
3.92g
91%
0.049mol/dm3

I will not lie my maths was the worst I didn’t really get answers 😭 but just some working out .
Yh what did u guys get for the hydrogen fuel advantage and disadvantages McQ
Original post by Elle6363
I will not lie my maths was the worst I didn’t really get answers 😭 but just some working out .


For the cations and anions question I put flame test the green blue flame and then silver nitrate and white precipitation
Original post by Pirameister
Yh what did u guys get for the hydrogen fuel advantage and disadvantages McQ

I think I put A , uhh the no green house gases emitted one
Yh me too
What did you guys get for the graph question with the marble chips
Original post by Pirameister
Are you guys doing the answer dump here?



I can’t remember all my maths ones but I definitely got 0.049mol/dm3 and 91% and I think I can remember getting the other two so hopefully that’s like 15/20 marks guaranteed

Original post by Pirameister
For the hydrogen fuel advantage and disadvantage one what’d everyone get
For the maths I got
102dm3
3.92g
91%
0.049mol/dm3
Original post by Pirameister
What did you guys get for the graph question with the marble chips


The multiple choice right , I put c
Original post by Elle6363
The multiple choice right , I put c

Was C the one where it said that as time increases the rate of reaction will decrease.
What did you guys put for the 6 marker, I just done calculations of atom economy (66.01%<89% or something, idr the number) and said method 2 is more sustainable because less waste is produced, therefore, it would be cheaper to deal with waste. I also talked abour why method 1 isnt sustainable
For the last question, what did you put for the % of carbon emissions 1 marker, I put like 13.2%, I wasnt sure about that question.
And for the 3 marker on the practical of rate of reaction, what did you put? I just talked about gas syringe to collect vol of co2 more accurately, and hydrogen peroxide in the flask, and heat it to 30 degrees, and stopwatch, and said the time should be less and explained using particle model and repeat to find anomalies. Dunnoo if I got all of those right
Original post by Pirameister
For the hydrogen fuel advantage and disadvantage one what’d everyone get
For the maths I got
102dm3
3.92g
91%
0.049mol/dm3


how did you get 0.049 mol/dm3 i got 0.20 did you remember to multiply the moles by 2 as it was a 2:1 ratio

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