Chemistry: Post your doubts here!

[robinhoodmustafa]

Can anyone please give me marking scheme explanations for what are electrophiles, nucleophiles and free radicals?

Electrophile : a particle with a positive charge to gain electrons
Nucleophile Particles with negative charge to donate electrons
Free radical are neutral atom obtain from homolytic fission

 

[robinhoodmustafa]

In definition what am I supposed to say !

Electrophile : a particle with a positive charge to gain electrons
Nucleophile Particles with negative charge to donate electrons
Free radical are neutral atom obtain from homolytic fission

 

[AbbbbY]

What about nmr spectroscopy in A2? Like, should I be memorising the Peaks at certain chmical shifts?

Lol. How exactly would that work?
The peaks vary depending on the compound and the shift depends on the environment.

 

[Haya Ahmed]

http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_w11_qp_22.pdf

What is the difference in Question 3(b) iii and Q3 (c) iii why is the answer of the enthalpy change here is positive and here is negative !! can someone help me Please!!!

 

[Mohammed salik]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w11_qp_22.pdf

What is the difference in Question 3(b) iii and Q3 (c) iii why is the answer of the enthalpy change here is positive and here is negative !! can someone help me Please!!!

In first one Heat is given out so temp of surrounding Increased so Exothermic ie Negative
Second one Temp decreased , Heat absorbed so ENDOTHERMIC i.e Possitive!

 

[AbbbbY]

Okay people. Just a little confusion I've got left.
Could you guys let me know all the reagents that'd give each of 1, 2 and 3. Also, let me know if any of the 3 is not possible.

Namehere Suchal Riaz

 

[Mohammed salik]

1st one is Na metal
2nd one is Not possible
3rd one is Na2CO3 or NaHCO3!

Okay people. Just a little confusion I've got left.
Could you guys let me know all the reagents that'd give each of 1, 2 and 3. Also, let me know if any of the 3 is not possible.

Namehere Suchal Riaz

 

[ruler_of_the_world]

What about nmr spectroscopy in A2? Like, should I be memorising the Peaks at certain chmical shifts?

you dont have to memorize the chemical shifts as you will be provided with the data booklet which includes the data of the groups and their respective chemical shifts. What you must know are the ratio of the peaks of Br and Cl.

 

[sitooon]

I was practicing P4's and I just came across this. Why would it pop up in AS if it's in P4 :/

A Guess .

 

[Namehere]

Okay people. Just a little confusion I've got left.
Could you guys let me know all the reagents that'd give each of 1, 2 and 3. Also, let me know if any of the 3 is not possible.

Namehere Suchal Riaz

I can´t believe I´m tagged! Just kidding...^^

 

[sitooon]

From where did the sun rise today ?
AbbbbY has a doubt hehehehe
Bil tawfeeq in you exams abby and no one
can deny your help to others
Inshallah you end with A*'s

 

[EddieX]

any guesses for the topics for chem tommorow :/

 

[farhan141]

My prep is shit... Still have to do organic chem

 

[AbbbbY]

From where did the sun rise today ?
AbbbbY has a doubt hehehehe
Bil tawfeeq in you exams abby and no one
can deny your help to others
Inshallah you end with A*'s

I'm only human, you know.

 

[Namehere]

I'm only human, you know.

Abby, lets show CIE what we are made of!

 

[AbbbbY]

1st one is Na metal
2nd one is Not possible
3rd one is Na2CO3 or NaHCO3!

I see. But my problem was primarily NaOH.

Which one of them would form?

I can´t believe I´m tagged! Just kidding...^^

Why not? You're one of the few that I've seen here with a really, really strong grasp on concepts

 

[Mohammed salik]

I see. But my problem was primarily NaOH.

Which one of them would form?


Why not? You're one of the few that I've seen here with a really, really strong grasp on concepts

3rd One

 

[Namehere]

I see. But my problem was primarily NaOH.

Which one of them would form?


Why not? You're one of the few that I've seen here with a really, really strong grasp on concepts

Well, thank you! That´s only cuz I like chemistry though!

 

[AbbbbY]

Well, thank you! That´s only cuz I like chemistry though!

Hahh. Same here. I fear what awaits in Math and Physics for me. I have yet to read a word of Physics Applications + I'm not too fond of P3 + I don't know normal distribution. :[
I would, instead of doing the aforementioned, spend more time reading on absolutely useless topics of Chem going into details and subtend beyond the A Level syllabus and often attend online classes of uni courses of chem hah.

 

[Namehere]

Hahh. Same here. I fear what awaits in Math and Physics for me. I have yet to read a word of Physics Applications + I'm not too fond of P3 + I don't know normal distribution. :[
I would, instead of doing the aforementioned, spend more time reading on absolutely useless topics of Chem going into details and subtend beyond the A Level syllabus and often attend online classes of uni courses of chem hah.

WOW, are you actually a replica of me!!??