Chemistry: Post your doubts here!

[Mr.Physics]

View attachment 57721
How is part (ii) Nucleophilic substitution?
Shouldn't it be electrophilic? please explain...

Hey did you get it mate? I don't think I'm really good at elaborating something ?

 

[nehaoscar]

Hey did you get it mate? I don't think I'm really good at elaborating something ?

Yeah kind of
I got it that NH2 is positive so the attacking group must be an nucleophile but then I don't understand how the CH3-CH2 will behave as a nucleophile

 

[Mr.Physics]

Yeah kind of
I got it that NH2 is positive so the attacking group must be an nucleophile but then I don't understand how the CH3-CH2 will behave as a nucleophile

Actually Carbon has 4 bonds but in CH3 it has 3. So it wants to get another bond

 

[nehaoscar]

Actually Carbon has 4 bonds but in CH3 it has 3. So it wants to get another bond

Doesn't that make it electron deficient since it doesn't have one bond... so it wont be nucleophilic then :/

 

[nehaoscar]

9093 English AS
Any tips on how to write a commentary?
Like the layout and perhaps a list of features and effects to look for?
Can anyone provide me with sample commentaries if you have done in school? (preferably with marks)

Also tips on paper 1 and paper 2 as well to get an A
Thanks in advance

 

[nehaoscar]

Hi,
Anyone have an online copy for the new 2016 second edition chemistry coursebook?
Or could anyone help me out with a scan copy of just a couple of the chapters from the A2 portion that I require please?
Regards

 

[Saad the Paki]

Can some one explain Q26 please!

 

[Copy Cat]

Can some one explain Q21 please! View attachment 57737

I guess you posted the Wrong Screenshot or typed in the Wrong Question no.

 

[Saad the Paki]

I guess you posted the Wrong Screenshot or typed in the Wrong Question no.

Sorry my bad. I meant 26.
But still can u do it?

 

[Dark Destination]

How to prepare for Chemistry Paper 5 from scratch?
I'm done with AS and A2 syllabus, because I've already given Paper 2 and Paper 4.
What more do I need to do in order to get good marks in Paper 5?

 

[The Sarcastic Retard]

How to prepare for Chemistry Paper 5 from scratch?
I'm done with AS and A2 syllabus, because I've already given Paper 2 and Paper 4.
What more do I need to do in order to get good marks in Paper 5?

Plan experiments according to question asked. Practice. (Y)

 

[MarcoReus]

How to prepare for Chemistry Paper 5 from scratch?
I'm done with AS and A2 syllabus, because I've already given Paper 2 and Paper 4.
What more do I need to do in order to get good marks in Paper 5?

Bhai P1 parhle. It's way more difficult than P2!

 

[Dark Destination]

Bhai P1 parhle. It's way more difficult than P2!

How? Should I revise the syllabus for AS again?

 

[MarcoReus]

How? Should I revise the syllabus for AS again?

Talking like you know the entire syllabus inside-out lol. Ofc revise it again and practice MCQs, way more tricky than P2.

 

[nehaoscar]

Can some one explain Q26 please! View attachment 57737

To form a diol, the carbon next to the alkene needs to have atleast one hydrogen attached to it. So A and D are wrong.
To form a ketone, you need a secondary alcohol i.e 1H and 2R groups attached to the carbon with the OH
To give a di-ketone, both the carbons with OH must be secondary alcohols
This is seen in C so it's C.

 

[Bah...]

Hello, does anyone have s02 qp1? I need it ASAP.
Thanks in advance

 

[Anum96]

Hello, does anyone have s02 qp1? I need it ASAP.
Thanks in advance

http://studyguide.pk/Past Papers/CIE/International A And AS Level/9701 - Chemistry/9701_s02_qp_1.pdf

 

[Bah...]

http://studyguide.pk/Past Papers/CIE/International A And AS Level/9701 - Chemistry/9701_s02_qp_1.pdf

Thank you so much, Anum!

 

[***amd***]

http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_s15_qp_12.pdf
Q12

 

[phanttasy]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s15_qp_12.pdf
Q12

see attachment for the explanation
hope you can understand