Chemistry: Post your doubts here!

[FairyTail]

Does anyone know what might come for paper 34 chem well not right now but later on

 

[anastasia grey113]

Anybody got 9701_m18_qp_42?

m looking for em too
but they wont officially be released b4 the 17th :/

 

[Mstudent]

PLZ help

 

[Zaki ali asghar]

https://papers.gceguide.com/A Levels/Chemistry (9701)/9701_s17_qp_43.pdf can someone explain 3bii, the coordination and formulae of D AND F?

 

[Holmes]

PLZ help
View attachment 63549
View attachment 63550

Hope it helps you Mstudent

 

[Holmes]

m looking for em too
but they wont officially be released b4 the 17th :/

Kindly post them here as soon as you get them.

 

[SohaibButt]

Anyone?

 

[Mts.99]

View attachment 63558

Hope it helps you Mstudent

can u pls explain the charges on each?

 

[dumbledore.]

View attachment 63545
How do we come to know where to place the Cl and NH3? Cant there be any other arrangement apart from these?
View attachment 63546

It can form only coordination 4 which shows cis trans isomer . For cis chlorine should be 90 degree to each other while for trans both chlorine should be 180 degree to each other . Chorine placed anywhere other then 180 degree will only have 90 degree because all four are on same plane. Not to loose marks just male chlorine next to the other chlorine to show cis isomer.

 

[dumbledore.]

plz helppp

 

[Krypton36]

View attachment 63564 View attachment 63565 plz helppp

Im sure you calculated the Mr for i.
1 gram of the sample was taken so you divide the mass by Mr.
You then get the number of moles.
Which will be equal to one of the answers on the table for AgCl. Then you calculate the other values of n simply by looking at the ratios.

(These were just the steps so that you try it yourself) Good Luck.

 

[Holmes]

can u pls explain the charges on each?

Charges? I didn't get it

 

[Holmes]

9701/41_w2016

How to find Relative peak area?

 

[haithsoul]

View attachment 63566
9701/41_w2016

How to find Relative peak area?

its simply the number of proton attached to the carbon if its CH3 the relative peak area is 3 if OH the 1 and so on

 

[Holmes]

its simply the number of proton attached to the carbon if its CH3 the relative peak area is 3 if OH the 1 and so on

Simply!!!

 

[anastasia grey113]

Anyone?

Also Holmes this is actually the correct explanation
well you can only have two isomers
cis and trans
and for the cis isomer, there will be two optical isomers since there is also a bidentate ligand present
THIS IS TRANS

THE ONES BELOW ARE BOTH CIS AND MIRROR IMAGES OF EACH OTHER...THE LINE IN BETWEEN IS THE MIRROR
THIS KIND OF ISOMERISM IS ONLY POSSIBLE WHEN BIDENTATE LIGANDS ARE ALSO PRESENT

 

[anastasia grey113]

can u pls explain the charges on each?

Zaki ali asghar
i think phenol should ionise in such a high pH aint it?
and i think it is tyr that is P and the phe-tyr and phe are R and S
becuz like phe has a low mass and double the charge since phenol and acid both ionise
and since phe-tyr has double the mass and double the charge than tyr, the movement of both is same in the end

 

[Minsa Fatima]

if there were 3 en ligands you could have done optical but in this case its 2 different ligands 2 en's and one other ligand so its cis trans

I dont think this is the case. It would still show optical isomerism.

 

[Holmes]

Also Holmes this is actually the correct explanation
well you can only have two isomers
cis and trans
and for the cis isomer, there will be two optical isomers since there is also a bidentate ligand present
THIS IS TRANS
View attachment 63567
THE ONES BELOW ARE BOTH CIS AND MIRROR IMAGES OF EACH OTHER...THE LINE IN BETWEEN IS THE MIRROR
THIS KIND OF ISOMERISM IS ONLY POSSIBLE WHEN BIDENTATE LIGANDS ARE ALSO PRESENT
View attachment 63568

Great shot

 

[Zaki ali asghar]

Why would HO2CCO2H react with MN04- ions? and which reaction is this?