Chemistry P4| A2 only

[zackle09]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s08_qp_4.pdf
can someone please explain QUES 8 b?

 

[zackle09]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s08_qp_4.pdf
can someone please explain QUES 8 b?

 

[Angelina_25]

Assalamu Alaikum there
M/j 2002 Q4 part c)i) y there is no reaction ?
http://freeexampapers.com/index.php...evel/Chemistry/CIE/2002 Jun/9701_s02_ms_4.pdf

 

[Angelina_25]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s08_qp_4.pdf
can someone please explain QUES 8 b?

Well nw we have to link up all the tri peptides in such a way that we get the whole polypeptide .....this is done by trial and error method
The first aminoacid has to be methionine and the last aminoacid should be lysine
So the order will be met-ala-gly-all-gly-arg-val -lys

 

[zackle09]

Well nw we have to link up all the tri peptides in such a way that we get the whole polypeptide .....this is done by trial and error method
The first aminoacid has to be methionine and the last aminoacid should be lysine
So the order will be met-ala-gly-all-gly-arg-val -lys

oh i get it now! thankyou

 

[hope4thebest]

Help needed people

 

[hope4thebest]

Also
http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_s10_qp_43.pdf
Question 4 part (e)

 

[Angelina_25]

Also
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s10_qp_43.pdf
Question 4 part (e)

 

[periyasamy]

Hi guys.Can anyone mind explaining this to me .Thanks guys.Cant understand even by refering to books.

 

[periyasamy]

Well nw we have to link up all the tri peptides in such a way that we get the whole polypeptide .....this is done by trial and error method
The first aminoacid has to be methionine and the last aminoacid should be lysine
So the order will be met-ala-gly-all-gly-arg-val -lys

Hi just wanna ask what does "all"representThanks.

 

[Angelina_25]

Hi just wanna ask what does "all"representThanks.

Oops sorry ....thats was a spelling mistake :/ This was meant to be "ala" for the aminoacid Alanine

 

[periyasamy]

Assalamu Alaikum there
M/j 2002 Q4 part c)i) y there is no reaction ?
http://freeexampapers.com/index.php/directory/download?location=A Level/Chemistry/CIE/2002 Jun/9701_s02_ms_4.pdf

I think the answer is wrong because the e reduction-e oxidation=1.36-0.77=>+ve value,suppose to be feasible.

 

[Angelina_25]

Hi guys.Can anyone mind explaining this to me .Thanks guys.Cant understand even by refering to books.

ALKENES REACTION .....We know under hot conc KMnO4 forms some some specific products which relies upon the functional carbon .....where it could primary ,secondary or tertiary carbon .....
So primary carbon always form carbondioxide and water ........
And secondary carbon always form carboxylic acid ......
And tertiary carbon always form for ketone ....
I hope u understand the pic

 

[periyasamy]

View attachment 39683
ALKENES REACTION .....We know under hot conc KMnO4 forms some some specific products which relies upon the functional carbon .....where it could primary ,secondary or tertiary carbon .....
So primary carbon always form carbondioxide and water ........
And secondary carbon always form carboxylic acid ......
And tertiary carbon always form for ketone ....
I hope u understand the pic

Thank u a lot.

 

[periyasamy]

Hi guys,want to ask smthg.
How do i see which is identical.All seems same for me.Haha
The answer is j

 

[goodluckayesha]

papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s07_qp_4.pdf
http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_s07_ms_4.pdf
plzz explain Q1di n 1dii

 

[leonell]

Reaction kinetics:
are these the only equations:?

Rate= k x conc.

rate = change in conc./ change in time

????? or is there anything im missing cuz it feels like it when i answer the papers and the MS don't really help me out much with this either. Thank you

 

[Fahad1234567]

can anyone has A level chemistry topic wise combined past paper? P4?? need it badly i have exam on 12 may

 

[periyasamy]

Hei guys.Can anyone help me with this terribly hard question from may june 13 paper.Thank u.

 

[Angelina_25]

http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_w13_qp_41.pdf
Question 3 part d)iii) plzzz explain me how to find the concentration of the acid and the salt ...
Thanks in advance!