Edexcel A Level Chemistry 2019 Paper 1 Unofficial Mark Scheme

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prayformepls
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#1
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Making This in Advance of the Exam. Any Answers you remember, or want to compare submit it below.
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jp.lk12
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What did everyone write for the carbon dioxide buffer question?
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jp.lk12
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How did everyone feel about that paper? Thought it was okay, not great but could have been a lot worse too.

What did everyone write for the carbon dioxide buffer question?
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dontrevise
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Paper wasnt too bad but wasnt amazing either, for the co2 increase in the body i didnt get the whole jist but noted all of this down, h2co3 = co2 + h2o
Increase in h2co3 then applied to the buffer equation above, increase therefore further dissociation, of the h2co3 to hco3- and h+. hco3- is removed via the kidneys and thats about as far as i developed it
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dontrevise
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I know for sure u wont get many responses since this is the less popular exam board for chemistry so if anyone wants to talk about the exam feel free to pm
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Evil Homer
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(Original post by dontrevise)
I know for sure u wont get many responses since this is the less popular exam board for chemistry so if anyone wants to talk about the exam feel free to pm
No people are interested it just takes a little while to build up, stay patient, people will come

How did you find it today?
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Fluffer_656
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I thought it was a weird paper. Some really easy bits but again some tricky parts. For the H2C03 dissociation I talked about the c02 reacting with HCo2 minus to form further H2C03? Which shifted equilibrium to the left. This caused H2C03 to dissociate further to release C02 and H2O more readily to remove co2 that is toxic in the blood? I'm not sure. I think that might be wrong lol.
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ToniADEsewa18
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What did people get for kp ..? Because i got a large number
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jp.lk12
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(Original post by Fluffer_656)
I thought it was a weird paper. Some really easy bits but again some tricky parts. For the H2C03 dissociation I talked about the c02 reacting with HCo2 minus to form further H2C03? Which shifted equilibrium to the left. This caused H2C03 to dissociate further to release C02 and H2O more readily to remove co2 that is toxic in the blood? I'm not sure. I think that might be wrong lol.
I think I put it the opposite way around, I think I’m wrong so you’re probably right. And I agree a lot of the questions were quite weird.
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prayformepls
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Personally it was very bipolar. They were understandable questions, which I knew the answers to, but i think exam technique was a floor. Things with the Potassium Bromide, The Hot NaOH, like i knew it previously in revision, but didnt do so well today. Damn it. Well done guys, lets focus on the next exams! Message me in PM if you want to compare answers privately, or just post here.
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TomasD
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Like 647000 or something I cant remember how the numbers went but like 650000 somewhere there then atm-1
(Original post by ToniADEsewa18)
What did people get for kp ..? Because i got a large number
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TomasD
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2nd question on the paper ... about ppt not all redissolving, whats the answer anyone?
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ToniADEsewa18
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#13
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I got a similar answer phewww . Thank you
(Original post by TomasD)
Like 647000 or something I cant remember how the numbers went but like 650000 somewhere there then atm-1
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TomasD
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And for mass of sodium ethanoate, 0.432 g (or something alone these lines)?
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maryamakbar
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cl ppt dissolves in dilute ammonia but br doesn’t,, br ppt dissolves in conc ammonia i think!
(Original post by TomasD)
2nd question on the paper ... about ppt not all redissolving, whats the answer anyone?
Last edited by maryamakbar; 2 years ago
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jp.lk12
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The KBr was in excess, so there would still have been Br- ions remaining even after all the Chlorine has displaced bromide ions. Silver bromide doesn’t redissolve in dilute ammonia but silver chloride does. Silver bromide was the remaining precipitate
(Original post by TomasD)
2nd question on the paper ... about ppt not all redissolving, whats the answer anyone?
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ToniADEsewa18
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I got 0.45g
(Original post by TomasD)
And for mass of sodium ethanoate, 0.432 g (or something alone these lines)?
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jp.lk12
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I think I got that
(Original post by TomasD)
And for mass of sodium ethanoate, 0.432 g (or something alone these lines)?
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Munrhe
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What was the answer to mg 1018 or 2000 sth?
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TomasD
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I put the -2000 one... I am not really sure though
(Original post by Munrhe)
What was the answer to mg 1018 or 2000 sth?
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