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according to the esterif u hydrolyse ester how many oh are produced
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according to the esterif u hydrolyse ester how many oh are produced
Plz attach the link of the year and tell us the number of Q so that we can help u manhow 2 are formed is the hydroxyl group in carboxylic acid applicable also please clarify
Plz attach the link of the year and tell us the number of Q so that we can help u man
Have u seen the gt for summer and winter 2013 in both of them to get an A u need 93 marks and as u say u will lose abt 20 marks in P2 and 8 marks in P3 so that means u will get 40 in P2 and abt 32 in P3 that makes 72 so u need abt 21 marks in P1 according to last years gt to get an A so don't worry that much u will get an A inshallah and everyone else tooMan i have practiced most of P1 chemistry and still i am scoring in 20's :s
In p 21 , I think thatr i willlose 20 marks due to my silly mistakes in the silly questions
In p 32, i can lose up to 7-8 marks
so in P11,I need a high score to get an overall A incase{and for sure} the gt is high
Any way thanks man..and sure I will never lose hope...Inshallah Allah will help me
Allah kareem
Thank uHave u seen the gt for summer and winter 2013 in both of them to get an A u need 93 marks and as u say u will lose abt 20 marks in P2 and 8 marks in P3 so that means u will get 40 in P2 and abt 32 in P3 that makes 72 so u need abt 21 marks in P1 according to last years gt to get an A so don't worry that much u will get an A inshallah and everyone else too
Srry manhttp://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_w09_qp_12.pdf
Q27) Ans is C Howwwwwww? Plz HElp
you did something wrong , the equation of reaction is PbCl4 +2NaBr--> Pbcl2+Br2+ 2NaCl.ok,
according to the data,
the equation of the reaction is.
PbCl4 +4NaBr-->Pb+2Br2+4NaCl.
now
6.980g of PbCl4
calculate its moles,Mr=349
6.980/349
=0.02mol
now since mol ration is 1:2,
we have 0.04mol of Bromine.
to get the mass.
multiply moles with its mr
= 0.04X79.9
=3.196
^ your answer.
ok !Srry man
Tom morning i will do the paper, So can i answer ur Q tom PLZ??!
Oct/Nov 2012 variant 11
Guys please explain question 17 the answer is D
Q 11 answers 11 answer is A
Q 10 answer is C
Question 15 answer is B
Question 4 answer is A ?? How??
Please full explanation needed!!
http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_w09_qp_12.pdf
Q27) Ans is C Howwwwwww? Plz HElp
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w09_qp_12.pdf
Q27 PLZ EXPLAIN WHY CANT B be the answer
Hmmmm...You have very little time left... Do u have David Ecaster,Chemistry Book... If u have Then revise maximum topics... Just try to clear as much concepts as u can... Revise ol pst paper and don't worry about the marks... Just try to clear ur concepts up... insha Allah u will do great...Man i have practiced most of P1 chemistry and still i am scoring in 20's :s
In p 21 , I think thatr i willlose 20 marks due to my silly mistakes in the silly questions
In p 32, i can lose up to 7-8 marks
so in P11,I need a high score to get an overall A incase{and for sure} the gt is high
Any way thanks man..and sure I will never lose hope...Inshallah Allah will help me
Allah kareem
U mean david Acaster. Roger Norris, Lawrie Ryan BOOK ?? Orange cover??!Hmmmm...You have very little time left... Do u have David Ecaster,Chemistry Book... If u have Then revise maximum topics... Just try to clear as much concepts as u can... Revise ol pst paper and don't worry about the marks... Just try to clear ur concepts up... insha Allah u will do great...
http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_w09_qp_12.pdf
Q27) Ans is C Howwwwwww? Plz HElp
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w09_qp_12.pdf
Q27 PLZ EXPLAIN WHY CANT B be the answer
In the actual ion, CH3 is attached to O from CO2 but in this arrangement it is attached to the C from CO2 so orientation is not correct and ion is different.+1 to this.
anyone, help plz.
why not B?
Q10:
Q10:
all the basic stuff: oxygen is more electronegative than Cl and carbon.
in C the dipoles of O and Cl will cancel a little but out to leave a smaller overall dipole. in B it is not the case. C=O means carbon has other groups bonded to it which can share it's charge. o
Q25
in the transition state the OH would have bonded to C but the Cl would have been removed -- yet. overall it will have a negative charge as OH ion had a negative ion. exampleNu represent OH ion)
View attachment 45070
Q28
a very rough diagram:
View attachment 45071
22: In B it will form CH2OHCH2OH so H and OH are not in correct ratio and it is saturated anyway so it will not be polymerised.http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w09_qp_12.pdf
q22,
is C, y not B?
and q40.
explain plz
40: A would mean polymer has same number of molecules as monomer and would be identical to it so not possible.
If all 6.02x10^23 molecules react, it will form one molecule but 1/6.02x10^23 moles.
I'll just add on to Q40 since Ahmed Aqdam has addressed the other questions.
Q40. Requires a bit of reasoning, if 1 mole of monomer join together, we will get less than 1 mole of polymer.
If we end up with 1 mole of polymer in the end, it means none of the monomer has joined to any other!
Its like 1000 bricks (monomer) will build one house (polymer) , the number of monomer is expected to be more than polymers.
Hope it makes sense.
Q28
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