(WCH11) IAL Chemistry Unit 1- 6 October 2020 (Exam Discussion)

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8013
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This is my first exam, and maybe the first of many of you, being the first Chemistry paper.
Feel free to post any upcoming thoughts on the exam!
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Anthony1912
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Im doing all 6 units and i find that i dont have that much time in my hands right now since i just finished the spec. how many papers of each units should i finish before the exam?
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(Original post by Anthony1912)
Im doing all 6 units and i find that i dont have that much time in my hands right now since i just finished the spec. how many papers of each units should i finish before the exam?
You can use NH papers to get them. There are papers from 2015-2019, which should be enough for you given this limited amount of time.
And are you only taking chemistry?
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Has anyone tried the new spec papers? I think this mark is decent enough.
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Anthony1912
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Yes 66 raw marks is usually an A , although when i used to solve the papers id get a good mark but then in the exam i got less but atleast theres grade boundaries
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S.78_t
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Hello everyone
What are your topic predictions for the exam?
Paper 1,2 and 3 😅
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(Original post by S.78_t)
Hello everyone
What are your topic predictions for the exam?
Paper 1,2 and 3 😅
Is this for IAL?
I think that there will be 1 question on the ideal gas law.
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meilad6
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Can someone plz help me with C

Mohr’s salt, (NH4)2Fe(SO4)2.6H2O, is a blue-green crystalline solid usually made by dissolving equimolar amounts of iron(II) sulfate and ammonium sulfate in dilute sulfuric acid and then crystallising. The reaction may be represented by the equation
FeSO4.7H2O + (NH4)2SO4 → (NH4)2Fe(SO4)2.6H2O + H2O

(a) What mass of Mohr’s salt would be produced from 2.78g of iron(II) sulfate with excess ammonium sulfate, if the yield in the reaction was 80%?
A 2.22g
B 2.78g
C 3.14g
D 3.92g

(b) How many cations are there in each mole of Mohr’s salt?
[Avogadro constant, L = 6.0 × 10^23 mol−1]
A 6.0 × 1023
B 1.2 × 1024
C 1.8 × 1024
D 3.0 × 1024

(c) What is the percentage by mass of water in Mohr’s salt?
A 4.6%
B 18%
C 28%
D 72%
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(Original post by meilad6)
Can someone plz help me with C

Mohr’s salt, (NH4)2Fe(SO4)2.6H2O, is a blue-green crystalline solid usually made by dissolving equimolar amounts of iron(II) sulfate and ammonium sulfate in dilute sulfuric acid and then crystallising. The reaction may be represented by the equation
FeSO4.7H2O + (NH4)2SO4 → (NH4)2Fe(SO4)2.6H2O + H2O

(a) What mass of Mohr’s salt would be produced from 2.78g of iron(II) sulfate with excess ammonium sulfate, if the yield in the reaction was 80%?
A 2.22g
B 2.78g
C 3.14g
D 3.92g

(b) How many cations are there in each mole of Mohr’s salt?
[Avogadro constant, L = 6.0 × 10^23 mol−1]
A 6.0 × 1023
B 1.2 × 1024
C 1.8 × 1024
D 3.0 × 1024

(c) What is the percentage by mass of water in Mohr’s salt?
A 4.6%
B 18%
C 28%
D 72%
Just divide 2.6*18 (H2O mass x2.6) from the total Mr of the salt calculated.
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S.78_t
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(Original post by 8013)
Is this for IAL?
I think that there will be 1 question on the ideal gas law.
Yes..IAL
For unit 1 I also think there will be a question about the bond angles and at least a question about one of the mechanisms and moles... lots of moles
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meilad6
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(Original post by 8013)
Just divide 2.6*18 (H2O mass x2.6) from the total Mr of the salt calculated.
wait from where you got 2.6?
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8013
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(Original post by meilad6)
wait from where you got 2.6?
Sorry. Can you please type clearly? It should be 6 H2O but it is easy to misread as 2.6.
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#13
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I did the Jan 2019 paper and got 66 again.
I lost 3 marks on every question in section B (a coincidence), but got the most difficult question on section A correct, which only 26% of candidates did it.
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The house captains have given me a 250mL can of coffee to cheer for me. Thanks!
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meilad6
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(Original post by 8013)
Sorry. Can you please type clearly? It should be 6 H2O but it is easy to misread as 2.6.
oh okayy I got it, thank youu
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newlad632
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Hey how's everyone's preparation for unit 1? Best of luck for tomorrow.
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newlad632
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(Original post by Sihaamsbj)
How do you do that?? Please show me
Converting raw to UMS? Use this
https://qualifications.pearson.com/e...%20Level#step1
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(Original post by newlad632)
Hey how's everyone's preparation for unit 1? Best of luck for tomorrow.
I have completed the last paper (specimen) and scored 71/80.
I have gone through my sheet once again, with the hard U1 questions. I think that I am ready.
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S.78_t
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Can I get some help?
Part(b) please
Last edited by S.78_t; 11 months ago
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(Original post by S.78_t)
Can I get some help?
Part(b) please
Convert 120 dm3 to 0.12m3, and 25°C into 298K.
Then you can use pV=nRT.
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