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

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?

Reply 2

OP

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?

Reply 3

OP

Has anyone tried the new spec papers? I think this mark is decent enough.

Reply 4

Anthony1912

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

Reply 5

S.78_t

12

Hello everyone
What are your topic predictions for the exam?
Paper 1,2 and 3 😅

(edited 3 years ago)

Reply 6

OP

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.

Reply 7

meilad6

9

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]
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%

Reply 8

OP

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]
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.

Reply 9

S.78_t

12

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

Reply 10

meilad6

9

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?

Reply 11

OP

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.

Reply 12

OP

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.

Reply 13

OP

The house captains have given me a 250mL can of coffee to cheer for me. Thanks!

Reply 14

meilad6

9

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

Reply 15

newlad632

Hey how's everyone's preparation for unit 1? Best of luck for tomorrow.

Reply 16

newlad632

Original post by Sihaamsbj

How do you do that?? Please show me

Converting raw to UMS? Use this
https://qualifications.pearson.com/en/support/support-topics/results-certification/understanding-marks-and-grades/converting-marks-points-and-grades.html?QualFamily=International%20A%20Level#step1

Reply 17

OP