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# Edexcel IAL, Unit 4: Rates, Equilibria and Further Organic Chemistry. 14-Jun-2016 watch

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1. (Original post by Geethan)
Rhombic Sulphur entropy question? Although the equation said "S (Rhombic) + 3F2......", the data booklet suggests that Sulpher Rhombic generally consists as 8 Sulphur atoms. So do we multiply the molar entropy of S rhombic by 8?
I think you are supposed to. It makes sense that way. I didn't do it.
2. (Original post by Geethan)
Rhombic Sulphur entropy question? Although the equation said "S (Rhombic) + 3F2......", the data booklet suggests that Sulpher Rhombic generally consists as 8 Sulphur atoms. So do we multiply the molar entropy of S rhombic by 8?
Where it was written that it consists of 8 Sulphur atoms ? And the data booklet says that the entropy in the table given applies to single atoms
3. (Original post by PlayerBB)
Where it was written that it consists of 8 Sulphur atoms ? And the data booklet says that the entropy in the table given applies to single atoms
Just one S atom in the equation, so I think muliplication is not required
4. (Original post by 12103763d)
Just one S atom in the equation, so I think muliplication is not required
Yeah I believe that as well, but he's referring that in the data booklet it says that this Sulphur atom consists of 8 sulphur atoms or something!
5. volume vs rate
(Original post by Maria247)
That was a rate concentration graph.
6. You did not do it? why??
(Original post by Sandy_Vega30)
I think you are supposed to. It makes sense that way. I didn't do it.
7. It would be a curve if it is 1st order in rate vs volume. and the half life is not constant, so it is not 1st order.
(Original post by Sandy_Vega30)
But 1000/ t is directly proportional to initial rate of reaction while volume of IO3- is directly proportional to concentration. SO technically it's like a graph of rate against concentration. Hence, it's first order. My teacher confirmed it after seeing the paper.
8. I didn't multiply by 8, i didn't notice it.
9. (Original post by Quiton)
volume vs rate
It is not volume Vs rate, It was 1000/t (Rate) against volume. So it is first order. I showed the question to my teacher after the paper. He said it is first order.
10. It would be a curve if it is first order. I meant the same thing by saying volume vs rate. And your teacher is not supposed to read your question papers after the exam ??

(Original post by Sandy_Vega30)
It is not volume Vs rate, It was 1000/t (Rate) against volume. So it is first order. I showed the question to my teacher after the paper. He said it is first order.
11. Oh don't worry.. you don't have to multiply by 8..
(Original post by Sandy_Vega30)
I didn't multiply by 8, i didn't notice it.
12. (Original post by PlayerBB)
Yeah I believe that as well, but he's referring that in the data booklet it says that this Sulphur atom consists of 8 sulphur atoms or something!
8 is the number of atoms per S molecule, if S exists as 8 atoms in equation, it multiplies by 8 to get that entropy, while if it exists as 1 atom, no multiplication is needed.
Take hydrogen as example, booklet says it has 2 atoms per molecule, so it normally exists as H2 in equation, multiplication of 2 is needed. If it exists as (1/2)H2, mathematically it contains only one H atom, so no multiplication is needed.
We can treat this S as (1/8)S8 alternatively, so for this, multiplication of 8 but also division of 8 is needed since it exists as 1 S atom, turning out no overall arithmetic. It's my opinion.
13. (Original post by Quiton)
It would be a curve if it is first order. I meant the same thing by saying volume vs rate. And your teacher is not supposed to read your question papers after the exam ??
how did your graph look like? My teacher is allowed to see the extra papers that come along after the exam is over. Our papers are already sealed when he read it. So no prblem.
14. (Original post by Blazyy)
I'm pretty sure.
Can anyone confirm, just in case?
I wrote pipette as well
15. (Original post by Blazyy)
It was 5 marks, I think you'll get 2 or 3. What about the nmr spectra of propanoic acid? It had 3 peaks right, 2 triplets and 1 quartet
I got a singlet, quartet and a triplet :/
16. (Original post by Sandy_Vega30)
I think you are supposed to. It makes sense that way. I didn't do it.
Neither did I
17. (Original post by Sandy_Vega30)
I think you are supposed to. It makes sense that way. I didn't do it.
What was the skeletal formula of the ester formed? the one where something reacted with excess propanoic acid? :O
18. I am not sure.
19. (Original post by notsoclueless)
What was the skeletal formula of the ester formed? the one where something reacted with excess propanoic acid? :O
this is my answer, not sure if it's correct or not
20. as it's excess propanoic acid (both carbonyl group react with propanoic acid)

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