Chemistry: Post your doubts here!

[animesh]

can any one upload notes for paper 4 plz i got an exam tomorrow

 

[perpetuallystressed]

http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_w11_qp_43.pdf

I need help in 3(e)(iv)! I don't know how to get [CH3CO2Na] & [CH3CO2H].

 

[emilyy]

Hey guys, what do you do when you lose motivation? I did some dumb mistakes on that paper today, i feel bad.

same here
feelng rlly bad

 

[RoOkaYya G]

btw for kp wht answer u guys got?

 

[Camille96]

What is the difference between subsituted amide and simple amide? I'm confused

 

[Natitah18]

btw for kp wht answer u guys got?

I sat for paper 23, my ans is something x10^-13. Its a really small number, not sure if its correct. How about you?

 

[RoOkaYya G]

I sat for paper 23, my ans is something x10^-13. Its a really small number, not sure if its correct. How about you?

i sat for p22 :S

 

[Logitech]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w11_qp_43.pdf

I need help in 3(e)(iv)! I don't know how to get [CH3CO2Na] & [CH3CO2H].

I know the formula for the pH and I managed to get the concentration for the salt, but I cant get the concentration for the acid. If anybody else could help...

 

[Bilal Khan]

btw for kp wht answer u guys got?

I got wrong due to mistake in moles , otherwise the question went fine .

 

[ahmed butt]

how to study for 9701 chemistry as level

 

[♣♠ Magnanimous ♣♠]

how to study for 9701 chemistry as level

How to study means wat
Just read book twice or thrice and by completing chap by chap solve topicals of that chapter simple.
Your concepts are clear than you will ace As level easily

 

[abdul moeed rana]

I got wrong due to mistake in moles , otherwise the question went fine .

moles kia ha answer mein,matlab wats the right answer.

 

[Eyunice]

21 Tetramethyl-lead(IV), (CH3)4Pb, increases the rate of the reaction of methane with chlorine.
CH4(g) + Cl2(g) → CH3Cl(g) + HCl(g)
Why can tetramethyl-lead(IV) behave in this way?
A It is a source of methyl radicals.
B It releases CH3+ .
C It reacts with chloromethane and prevents equilibrium being established.
D Metal ions catalyse the reaction.

Ans : A

_9701_s07_qp_1
Question 20

Explain pls

 

[ahmed butt]

How to study means wat
Just read book twice or thrice and by completing chap by chap solve topicals of that chapter simple.
Your concepts are clear than you will ace As level easily

thx bro

 

[♣♠ Magnanimous ♣♠]

thx bro

No probs
Well while doing those chap refer this site too --> www.chemguide.co.uk
well it is a very complicated site so search any topic in google that you want to and after that write this site name
The first link will be of that site related to your topic

 

[RoOkaYya G]

moles kia ha answer mein,matlab wats the right answer.

wht was ur answer?

 

[bludlynsolja]

someone link to 2014 papers plz. thx

 

[Charlotte20102013]

Can someone explain this
http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_w11_qp_11.pdf
Q8 (Ans:A)
http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_s12_qp_12.pdf
Q14 (Ans:B)
Thanks!

 

[Charlotte20102013]

someone link to 2014 papers plz. thx

http://freeexampapers.automaticpapers.com/

 

[RoOkaYya G]

Can someone explain this
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w11_qp_11.pdf
Q8 (Ans:A)
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s12_qp_12.pdf
Q14 (Ans:B)
Thanks!

for Qu 14 its B because :
in reaction 1 theres bond breaking so its endo
in reaction 2 theres bond formation so its exo

for Qu 8 its A because:
it neutralises the H+ in both reactions..so its a base.
the quest is about BOTH reactions here. so A is correct