Chemistry and Physics some Keypoints/Notepoints (onDemandOnly) !! :)

[biba]

Jazaki Allahu Khair Thank you...^^ That made me feel so self-concious
MAy Allah Reward you twice the sucess He rewards me aameen!

amen !

 

[PhyZac]

Reactions for the formation of acid rain [Including nitrogen oxide as catalyst and how is it regenerated]

 

[waver525]

Reactions for the formation of acid rain [Including nitrogen oxide as catalyst and how is it regenerated]

So2 + No2 ---> No + So3
No + .5 O2 -----> No2

 

[PhyZac]

So2 + No2 ---> No + So3
No + .5 O2 -----> No2

Thank you so much..!! Jazaka Allah khairan!
May Allah s.w.t have mercy on you and family Aameenn! And In Sha Allah your exams will be easy Aameen!

 

[waver525]

hey xhizors can u help me with q 5 part a(iii) nd part b(iv) of this papr..

http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_s10_qp_41.pdf

http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_s10_ms_41.pdf

 

[PhyZac]

hey xhizors can u help me with q 5 part a(iii) nd part b(iv) of this papr..

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s10_qp_41.pdf

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s10_ms_41.pdf

For part a(iii)
In first left hand electrode..the reaction is
H2(g) + 2OH–(aq) -> 2H2O(l) + 2e–
so increasing OH- will favour forward reaction, therefore more electrons, thus more negative

IN the second reaction
O2(g) + 2H2O(l) + 4e– -> 4OH–(aq)
increasing OH- favour backward reaction, therefore more electrons, more negative.

 

[waver525]

For part a(iii)
In first left hand electrode..the reaction is
H2(g) + 2OH–(aq) -> 2H2O(l) + 2e–
so increasing OH- will favour forward reaction, therefore more electrons, thus more negative

IN the second reaction
O2(g) + 2H2O(l) + 4e– -> 4OH–(aq)
increasing OH- favour backward reaction, therefore more electrons, more negative.

thnk bro can u explain fr part b also..??
nd yeh one thing I missed
so3 + h2o gives h2so4 which makwd acid rain

 

[PhyZac]

thnk bro can u explain fr part b also..??
nd yeh one thing I missed
so3 + h2o gives h2so4 which makwd acid rain

Okay see, from the equation of the booklet
Thank you so much!! Jazaka Allah khairan.

Pb2+ + 2e– ⇌ Pb E=–0.13
PbO2 + 4H+ + 2e– ⇌ Pb2+ + 2H2O E=+1.47

So when Pb2+ decrease
the 1st reaction will go backward..making it more negative
while 2nd reaction will go more forward so more positive

So the difference between the two number will increase.

 

[knowitall10]

Assalamu 'Alaykum.
Can somebody please post the link to the winter 2011 examiner's report please?
Jazakum Allahu Khair..

 

[knowitall10]

Assalamu 'Alaykum.
Can somebody please post the link to the winter 2011 examiner's report please?
Jazakum Allahu Khair..

alright, never mind, thanks..

 

[seneria]

can any one tell me how to draw the sructural formulae of june 11 paper 41 ques 6 part (b) strucure D?

 

[knowitall10]

Allah Yawaffagkum!!!
Good Luck for your Chemistry P4 tomorrow!!!
May Allah Succeed us all!!!!!!!!!!!!!!!!!!!!

 

[shirazosama100]

IA..

 

[hassantariq]

please tell me conditions for hydrolysis and condensation of esters and polypeptides?

 

[marz_katy]

can sum1 plzzzzzzzzzzzzz teach me about colorimetry!!