Chemistry: Post your doubts here!

[Snowysangel]

Guys can nabh4 convert an
acid into an alcohol?

Yes with an aldehyde as the intermediate

 

[robinhoodmustafa]

Please help me in this. How to fill out moles after equilibrium. I don't get how he (ms) got the and.Sorry fr the upside down image but pls do help

 

[mahnoor wadood]

Can anyone tell me the guess question for paper 2 and paper 4 please

 

[Mohammed salik]

Please help me in this. How to fill out moles after equilibrium. I don't get how he (ms) got the and.Sorry fr the upside down image but pls do help


View attachment 40848

What are the answeres?
Are they ..
1.5 for Acid
8 For Ethanol
1.5 for ester
1.5 for wwater?

 

[mehria]

What are the answeres?
Are they ..
6.5 for Acid
13 For Ethanol
1.5 for ester
1.5 for wwater?

how u got 13 for ethanol?
isn't it suppose to b 8

 

[MiniSacBall]

Please help me in this. How to fill out moles after equilibrium. I don't get how he (ms) got the and.Sorry fr the upside down image but pls do help


View attachment 40848

It would be much better if you could link us to past papers, with question number rather than just trying to take a pic and then upload, which is much harder and confusing both for you and us.

 

[Mohammed salik]

You even if you get AgSO4, it will be dissolved,


It would be much better if you could link us to past papers, with question number rather than just trying to take a pic and then upload, which is much harder and confusing both for you and us.

True That!

 

[robinhoodmustafa]

It would be much better if you could link us to past papers, with question number rather than just trying to take a pic and then upload, which is much harder and confusing both for you and us.

True That!

Well this is the question. Rest of the part is irrelevant..
Can u guys just explain me how you got 8,6.5, 1.5 and 1.5

 

[Mohammed salik]

Well this is the question. Rest of the part is irrelevant..
Can u guys just explain me how you got 8,6.5, 1.5 and 1.5

Look they all react in 1:1:1:1!
If 1.5 of Acid remained it means (8-1.5) =6.5 used Up!
Which also means not 6.5 Would Be used up By ethanol so 14.5-6.5=8.0!

Now Come to the Products..
These would be The amount used Up(because the used up amount of acid and alchol is being converted to Products)
which is 6.5. for both because they are 1:1!

I Hope U Understand!

 

[Snow Angel]

please can someone explain question 2b ii) from: papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w13_qp_22.pdf

how r the 3 structures different from each other???

please answer as soon as possible. thnx in advance.

 

[Mohammed salik]

Please help me in this. How to fill out moles after equilibrium. I don't get how he (ms) got the and.Sorry fr the upside down image but pls do help


View attachment 40848

What are the anss??​

 

[Snowysangel]

please can someone explain question 2b ii) from: papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w13_qp_22.pdf

how r the 3 structures different from each other???

please answer as soon as possible. thnx in advance.

Is the same difference as that between alpha and beta glucose molecules. The chlorine atom can either be above the ring or below it, and so depending on its position, it forms a different and specific compound

 

[robinhoodmustafa]

What are the anss??​

wait.i m uploading the whole question

 

[Snow Angel]

why is mercury liquid at room temperature?

 

[Snow Angel]

Is the same difference as that between alpha and beta glucose molecules. The chlorine atom can either be above the ring or below it, and so depending on its position, it forms a different and specific compound

thnx but i still can't understand.

 

[Snow Angel]

please can someone explain q 4b) from: papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_y16_sp_2.pdf

thnx in advance.

 

[MiniSacBall]

Well this is the question. Rest of the part is irrelevant..
Can u guys just explain me how you got 8,6.5, 1.5 and 1.5

Well acutally i meant some thing like this:
You can find other members doing like this:
"please can someone explain question 2b ii) from: papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w13_qp_22.pdf

how r the 3 structures different from each other???

please answer as soon as possible. thnx in advance."

They simply mention the question like above 2) b) i), and link to past paper, that's much better and more convenient way!

 

[Mohammed salik]

why is mercury liquid at room temperature?

Vander waal's Forces weak!

 

[princeali97]

please can someone explain q 4b) from: papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_y16_sp_2.pdf

thnx in advance.

Minor product is one in which halogen atom is bonded to a carbon atom with the most number of hydrogen atoms,So it shud be CH3CH2CH2Br.
C is more likely to be the product because it is more stable i think as the central carbon atom has greater charge density around it.Im thinkso im not sure in this 1

 

[Mohammed salik]

Minor product is one in which halogen atom is bonded to a carbon atom with the most number of hydrogen atoms,So it shud be CH3CH2CH2Br.
C is more likely to be the product because it is more stable i think as the central carbon atom has greater charge density around it.Im thinkso im not sure in this 1

Yes You are right.. this is due to Inductive effect of Alkyl chain ( electron donating chain) which stabilizes the carbon!!