Chemistry: Post your doubts here!

[..sacrifice4Revenge..]

no it's As. i have figured it out. thanks for pretending to help.

ene

K.

 

[Suchal Riaz]

Well, you were talking about reduction potentials.. which I think is A2. Don´t listen too much to me though, I´m a very "mistaky" person...

i was talking about my question not that one.

 

[hope4thebest]

Does anyone here have any diagram of electrophoresis? I mean an easy one because Marking schemes shows 3D diagrams. Thank You Suchal Riaz AbbbbY Namehere

 

[omaaaar]

The P2 chemistry paper was such a big piece of cake never seen such an easy paper
The easiest organic chemistry question of the century I must say

 

[Syeda Rida Rizvi]

The P2 chemistry paper was such a big piece of cake never seen such an easy paper
The easiest organic chemistry question of the century I must say

I agree!

 

[kitkat <3 :P]

Please help me asap
View attachment 41543

I think Pb2+ should be In FB8 as the first test will have the same result for Al3+ ans Pb2+ and the yellow ppt is given with sol with Pb2+ in it
FB7 has Zn2+ ions cuz its producing soluble ppt with OH- ions ehich are present in FB5
About the sulfate ions m not sure :/ but Pb2+ gives white ppt with SO4 ^2- so maybe its FB7 :/ hope m not too late

 

[Browny]

Can anybody tell me the errors for the apparatus we normally get for the practical exam?

 

[Logitech]

any idea about p31 guys?

 

[zain ul abidin]

Is this V1? bcz i got X=1 For Variant One !

it's varient 2

 

[zain ul abidin]

How did you calculate the molar mass of the compound?

But wasnt the no of moles of the compound = 6.3/0.01, since there were 0.05/5=0.01 moles of it

Mr was 126

 

[Snowysangel]

Mr was 126

How? We did have to divide .05 by 5 right cause the number if moles of the hydrated compound was 1 while in the equation it was 5..

 

[Snowysangel]

How? We did have to divide .05 by 5 right cause the number if moles of the hydrated compound was 1 while in the equation it was 5..

And if you divide 126-90 by 18, you do get 2...but if you divide 630-90 by 18 you get 30

 

[Snowysangel]

And if you divide 126-90 by 18, you do get 2...but if you divide 630-90 by 18 you get 30

And 126=6.3/0.05

 

[AbbbbY]

The P2 chemistry paper was such a big piece of cake never seen such an easy paper
The easiest organic chemistry question of the century I must say

Agreed.

Although, the paper had a few places where people could drop marks.
A lot of people seem to have dropped marks in making the ketone.

Another common mistake was in the isomers question. The question asked for 3 different structural formulae of C6H12 that showed cis-trans but a lot of ppl made the cis & the trans isomers of the same structure. Regardless, should be an easy A for most despite the slightly increased GT that I'm expecting for this paper.

 

[itallion stallion]

http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_s10_qp_42.pdf
Can someone plz explain q8'part a,why isn't the answer reaction 1.
Thanks

 

[A star]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s10_qp_42.pdf
Can someone plz explain q8'part a,why isn't the answer reaction 1.
Thanks

it should be 1 i think the ms is wrong!!!!!

 

[itallion stallion]

it should be 1 i think the ms is wrong!!!!!

Thanks a lot!
Can u plz check this too

http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_w10_qp_43.pdf
Q5a
I can't decide which equation to take for production of oxygen.in the 'Eo for Cl it will be taken as -1.36v
And Eo cell should be then -0.83-(-1.36).but ms gives a different answer.
Thanks!

 

[Logitech]

http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_s08_qp_31.pdf
For question 2f what supporting evidence can I give?

 

[mynameisnotneeded]

Alrighty so who else had P33 today??

 

[mynameisnotneeded]

Can someone give me an estimated grade threshold for the current (2014) chemistry paper 2

Think there is a seperate post for that with a poll. Pls check there. I guess it will be like 40-45 ish
Hardly any organic (but not all people found that one easy) and only periodicity, it would be average...