Discussion of Chemistry Paper 41 12th May 2014

[bob 1234]

How was Chemistry paper 41

 

[Daniyal Khawaja]

The paper was hard so I really hope the GT is low.

In the second question I gave the wrong isomer for the platinum compound but gave the right type of isomerism.
The organic chemistry one (i think it was the fourth one) with the pH thing I kinda ruined. But the one in which we had to give 2 structures of the organic compounds was pretty easy and I'm pretty sure I got it right.
In Section B I pretty much guessed the last page but the rest was incredibly easy.

However, I know I've made silly mistakes so expecting around 65-70.

 

[Manobilly]

The paper was hard so I really hope the GT is low.

In the second question I gave the wrong isomer for the platinum compound but gave the right type of isomerism.
The organic chemistry one (i think it was the fourth one) with the pH thing I kinda ruined. But the one in which we had to give 2 structures of the organic compounds was pretty easy and I'm pretty sure I got it right.
In Section B I pretty much guessed the last page but the rest was incredibly easy.

However, I know I've made silly mistakes so expecting around 65-70.

the isomer for platinum is actually included in the syllabus for 2016 ,cie cheated with us.Yeah the gt would be arnd 50-60

 

[bob 1234]

the isomer for platinum is actually included in the syllabus for 2016 ,cie cheated with us.Yeah the gt would be arnd 50-60

well atleast that means we werent expected to know it,

 

[Manobilly]

well atleast that means we werent expected to know it,

yes.

 

[bob 1234]

The paper was hard so I really hope the GT is low.

In the second question I gave the wrong isomer for the platinum compound but gave the right type of isomerism.
The organic chemistry one (i think it was the fourth one) with the pH thing I kinda ruined. But the one in which we had to give 2 structures of the organic compounds was pretty easy and I'm pretty sure I got it right.
In Section B I pretty much guessed the last page but the rest was incredibly easy.

However, I know I've made silly mistakes so expecting around 65-70.

What pH organic chemistry thing?, you mean the NH2 question?

 

[Daniyal Khawaja]

What pH organic chemistry thing?, you mean the NH2 question?

yeah the one in which we had to make the pH graph. I know I made the correct shape but not sure about where the equivalent point was.

plus I wrote piperidine is more basic than ammonia, which it isn't.

 

[bob 1234]

yeah the one in which we had to make the pH graph. I know I made the correct shape but not sure about where the equivalent point was.

plus I wrote piperidine is more basic than ammonia, which it isn't.

oh yeah bro that question was confusing, but no worries very few marks lost inshallah

 

[bob 1234]

oh yeah bro that question was confusing, but no worries very few marks lost inshallah

pipiredine is more basic, it has electron donating groups,, which will stabilise the cation formed when NH takes a H+ ion

 

[bob 1234]

yeah the one in which we had to make the pH graph. I know I made the correct shape but not sure about where the equivalent point was.

plus I wrote piperidine is more basic than ammonia, which it isn't.

http://www.mhhe.com/physsci/chemistry/carey/student/olc/graphics/carey04oc/ch22/others/ch22ans.html this tells you piperidine is the most basic

 

[Daniyal Khawaja]

pipiredine is more basic, it has electron donating groups,, which will stabilise the cation formed when NH takes a H+ ion

See I thought the same thing, but pipiredine doesn't contain any electron donating groups. It only has -CH2 groups which don't donate any electrons [since -CH2 isn't an alkyl]

 

[Daniyal Khawaja]

http://www.mhhe.com/physsci/chemistry/carey/student/olc/graphics/carey04oc/ch22/others/ch22ans.html this tells you piperidine is the most basic

Yeah but they're comparing it to Aniline and Pyridine, not Ammonia.

 

[Daniyal Khawaja]

Ok so apparently Ammonia is weaker because it has a higher pKb value. So this means I got it right. YES!

 

[bob 1234]

Ok so apparently Ammonia is weaker because it has a higher pKb value. So this means I got it right. YES!

and CH2 isnt an alkyl group, but i think the ring of CH2's is so they act as electron donating groups

 

[bob 1234]

and CH2 isnt an alkyl group, but i think the ring of CH2's is so they act as electron donating groups

no wait sorry thats wrong