chemistry p1 question problem

[Scafalon40]

http://www.xtremepapers.com/CIE/International A And AS Level/9701 - Chemistry/9701_s05_qp_1.pdf
look at question 40
shouldn't that ethyl group have a CH3 in the end, instead of CH2
if not, then i don't understand how statement 1 is correct

 

[JulyMei]

Is the answer 1 and 2??

 

[Scafalon40]

yes

 

[JulyMei]

When the compound under goes alkaline hydrolysis. The ester bond will break. So, it forms salt and alcohol. So, it's 1 and 2..

 

[JulyMei]

Oh! I get what u mean.. The CH3 at the end.. Hmm.. I think because the salt part doesn't use the H+, so, it binds to the CH2, since CH2 still can bind one more H+..

I think so..

 

[Scafalon40]

http://www.xtremepapers.com/CIE/International A And AS Level/9701 - Chemistry/9701_w05_qp_1.pdf Q 17
another problem: are ligands in the AS syllabus?

 

[Scafalon40]

Oh! I get what u mean.. The CH3 at the end.. Hmm.. I think because the salt part doesn't use the H+, so, it binds to the CH2, since CH2 still can bind one more H+..

I think so..

In the question the diagram of that sun cream is given
The formula for the ethyl group on the extreme right for the cream is CH2CH2
It means that there is a double bond between the carbons
If so, then C has a valency of 5 because it is bonded to that main carbon chain too
How is that possible?

 

[DragonCub]

http://www.xtremepapers.com/CIE/International A And AS Level/9701 - Chemistry/9701_w05_qp_1.pdf Q 17
another problem: are ligands in the AS syllabus?

I don't think so. I have never heard of ligands in AS year. It should be in the A2 syllabus. Ligands are the ions or molecules which can combine with metal ions or atoms to form a complex. For example, Co(H2O)6, the water molecules behave as ligands in this complex. So in the question, the ammonia molecules (dissolved in water) act as ligands to the silver ion. Answer is B. I think this question is really beyond the AS syllabus

 

[Scafalon40]

I think this question is really beyond the AS syllabus

If thats the case then why is it on a question paper meant for AS

 

[JulyMei]

In the question the diagram of that sun cream is given
The formula for the ethyl group on the extreme right for the cream is CH2CH2
It means that there is a double bond between the carbons
If so, then C has a valency of 5 because it is bonded to that main carbon chain too
How is that possible?

That's why I don't think there's a double bond.
If so, I'm not sure though..

 

[JulyMei]

P

http://www.xtremepapers.com/CIE/International A And AS Level/9701 - Chemistry/9701_w05_qp_1.pdf Q 17
another problem: are ligands in the AS syllabus?

Probably it's an old syllabus..
Anyway, I learnt this in my college.. A little of it only though.. In the chapter of Periodic Table.

 

[Scafalon40]

That's why I don't think there's a double bond.
If so, I'm not sure though..

so did cie make a mistake then?

 

[Scafalon40]

P

Probably it's an old syllabus..
Anyway, I learnt this in my college.. A little of it only though.. In the chapter of Periodic Table.

do you have a copy of the old syllabus?

 

[JulyMei]

do you have a copy of the old syllabus?

nopp..
I don't.. but i think you can get it on xtremepaper..

 

[Scafalon40]

I think CIE did infact make a mistake, or maybe i did!
Anyway, here is an newer paper with the same question :http://www.xtremepapers.com/CIE/International A And AS Level/9701 - Chemistry/9701_s09_qp_1.pdf Q 40
Tell me what you guys think

 

[JulyMei]

I think CIE did infact make a mistake, or maybe i did!
Anyway, here is an newer paper with the same question :http://www.xtremepapers.com/CIE/International A And AS Level/9701 - Chemistry/9701_s09_qp_1.pdf Q 40
Tell me what you guys think

if so, i think they did made a mistake. hahaha...

 

[Scafalon40]

if so, i think they did made a mistake. hahaha...

yeah
to think; cie makes mistakes too