Edexcel CHEMISTRY DOUBTS!!!!

[Assi1993]

Quote from: abuelzouz on June 23, 2011, 06:20:01 pm
I have the CGP guides, they are amazing, it is made exactly according to the syllabus, and lots of bits from exam even comes from it, i mean to say the questions are just so similar ( specially chemistry). since my AS level and now my A2 i have been preparing my exams from those books, and they are thin exact to the point and makes you understand so well. I have edexcel guides too but they arnt that good. they are just good for tips on answering questions .

i don't study from edexcel books i just revise and study CGP guides, and so far my grades have been from A's and B's  ( and just 2 C's)  .

i just commented because someone else said it wasn't good and they weren't right.
CGP revision guides are the key to success and passing in A levels .. if only everyone knew .

ohhh thn i wish i had it :|

[Romeesa-Chan]

I had CGP guide for my AS and it wasn't that great.

The Edexcel revision guide is MUCH better- I got it week before my exam during AS and alhamdullah. . . it was of great help. (:

I am also currently using the Edexcel A2 guide and it's amazing for revision one day before exam.

[ibuprofen500]

I see, maybe you didn't get the one for edexcel syllabus, or maybe you have different study method.
The edexcel guides i don't even bother reading them, i just read the tips part and the examiner comments those are useful since its from edexcel ..

As for me, i dono what i would have done without CGP books .....


anyhow Good luck for the exam, its just in 5 hours ....

[Romeesa-Chan]

I see, maybe you didn't get the one for edexcel syllabus, or maybe you have different study method.
The edexcel guides i don't even bother reading them, i just read the tips part and the examiner comments those are useful since its from edexcel ..

As for me, i dono what i would have done without CGP books .....


anyhow Good luck for the exam, its just in 5 hours ....

Perhaps that could be the case. (:

The textbook+guide+syllabus is a fine method to study. (for me at least)

Good luck! Do your best!

[guMnam]

romeesa U-4 wasnt reallly good for me.........!!!
now lets see if we rape the paper tomorrow or it rapes us:P

same here .. and i think its gonna happen again.. the baladkaar

[Romeesa-Chan]

jan 2011 Q 13 why isnt the answer A ??

Haha. I saw this by chance.
Anyways, here goes:

you start with 47g of Phenol, Mr 94.
Moles of phenol = mass / Mr
Moles of phenol = 47/94 = 0.5 moles

You have 85% yield in first step. So 85% of 0.5 = 0.425

You have 80% yield in second step. So 80% of 0.425 = 0.34 moles

This is the moles of aspirin (end product).
Mass = Moles x Mr
Mass = 0.34 x 180 = 61.2g

Therefore, the answer is B and not A.

[Romeesa-Chan]

same here .. and i think its gonna happen again.. the baladkaar

It was HORRIBLE for me.

No, this time. . . we will do baladkaar for Chemistry 5.

[guMnam]

Haha. I saw this by chance.
Anyways, here goes:

you start with 47g of Phenol, Mr 94.
Moles of phenol = mass / Mr
Moles of phenol = 47/94 = 0.5 moles

You have 85% yield in first step. So 85% of 0.5 = 0.425

You have 80% yield in second step. So 80% of 0.425 = 0.34 moles

This is the moles of aspirin (end product).
Mass = Moles x Mr
Mass = 0.34 x 180 = 61.2g

Therefore, the answer is B and not A.

thanx but u were late i worked it out already



and best of luk

[Romeesa-Chan]

thanx but u were late i worked it out already



and best of luk

Opsie.

Good luck! XD

[ibuprofen500]

i came here to ask the same question as gunmnam ,,,
but it was already here answered ..

thanks romeesa chan

[Romeesa-Chan]

i came here to ask the same question as gunmnam ,,,
but it was already here answered ..

thanks romeesa chan

Welcome!

Hope exam went great!

[EMO123]

How was your exams friends hope it was good for you all

[Romeesa-Chan]

Exam went well, alhamdullah. (:

[EMO123]

Exam went well, alhamdullah. (:

thank god

[**RoRo**]

I have a question guys, for A2 chemistry, do I need to 're-study' the AS modules as well?