Chemistry Paper 4-theory- doubts =D

[iKhaled]

PhyZac mariyam95 cheondoongiee haha cookies for u 3 good job!

 

[leosco1995]

I think it's like this- so in K the reaction is basically the first one right? RCH3 -> RCH2Cl. But you'll notice in the product, there's actually 9 places that Cl could have been put in. It can replace all the hydrogens in the methyl groups. So it becomes 1x9, and the ratio is 21:9.

Ah okay, I got it. Thanks.

 

[Anika Raisa]

Anika Raisa

MS is not wrong.

I probably get ur point but....

! Betwn any idea y i ws getting database error when i wanted to get to this page for the last fifteen min? :

 

[PhyZac]

Anika Raisa

You clearly missed a third line! for Mr.2

And thus ALL fragment of suspect 2 is found..while for Mr.1 i see a fragment not find in any scene!

 

[AlishaK]

PhyZac
Ok so how do we count now? what do we consider.

 

[haroon740]

Hey dude how are you ... Long time no see in tutions
So about ur question im gonna explain it to u even though it makes no sesnse at all

Look at step 1 ... a is for h2o2 b is for I- and c is for H+

In the first step h2o2 has appered once so right 1 in the first row of a
I- has appered one in the equation so put 1
And H+ is not there so put zero

For step 2 H2O2 is not there but still u have (1) in the first box so put another one because it was shown in the first step
For I- the same thing ..not shown in step 2 but u already has one from the spfirst step so put another 1
For hydrogen ion this time its shown in step 2 so put 1

For step 3
H2o2 u already has 1 from step 1 so put 1
I- is shown in step 3 and step 1 so put 2 because now u have 2 I- shown
H+ is shown in step 3 and step 2 so in total its shown twice so put 2

Thats it ..hope it hepls

Woah that was amazing ,and heyy Mariammmmmm
how have you been yeah long tyme so see in tutions
hows everyhting goin
Inbox
and Thanks a Ton

 

[Anika Raisa]

Anika Raisa

You clearly missed a third line! for Mr.2

And thus ALL fragment of suspect 2 is found..while for Mr.1 i see a fragment not find in any scene!

Oh now i c!! Thank u so much!!! Its definitely suspect 2 now!!! I have been spending so much tym on it!!!! Thank u! Bless ya!

 

[mariyam95]

Woah that was amazing ,and heyy Mariammmmmm
how have you been yeah long tyme so see in tutions
hows everyhting goin
Inbox
and Thanks a Ton

Im good alhumdu-li-allah
N u welcome

 

[nishan2052]

please provide me a simple link for rate of reaction. how to deal with numericals?

 

[xhizors]

Any short summary or note for how the pH effect the enzyme activity ?

xhizors
PhyZac
iKhaled
knowitall10

or anyone ?

JazakAllah

If its not answer yet here you go:
Bismillah!
the point to know is it denatures the enzyme
in acidic condidion enzyme get Nh3+ ions
in alkaline Condition enzyme get COO- ions

 

[Ramsha007]

Is my doubt invisible or nobody know the answer i have posted it 2 times if nobody want to give the ans or if my q doesn't make sense then plz tell me atleast. i will be Greatfull

 

[xhizors]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s12_qp_41.pdf
3 d Why Br on the benzene ring is in position written in the ms? can't put 'em (non-adjacent thou) anywhere? like 1st nd 5th position?
PhyZac
xhizors

the 2 4 6 positions are activated so thats why it is in 2, 4 , 6

 

[xhizors]

[Fe(H2O)6-n(NO2)n]^2+ (n=1 to 6)
explain?! xhizors
Q3 (D) why is that ketone getting reduced to -OH using Ni? !
I never learnt that Ni cn b used for ketones redn?!
Do u know? knowitall10

which part?

 

[PhyZac]

PhyZac
Ok so how do we count now? what do we consider.

 

[AlishaK]

the 2 4 6 positions are activated so thats why it is in 2, 4 , 6

okay what do u mean by activated, i wasnt taught in tht terminology!? :S

 

[AlishaK]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s12_qp_33.pdf
Q10 b ii knowitall10
xhizors
??

 

[xhizors]

Is my doubt invisible or nobody know the answer i have posted it 2 times if nobody want to give the ans or if my q doesn't make sense then plz tell me atleast. i will be Greatfull

Please post it last time

 

[xhizors]

PhyZac
Ok so how do we count now? what do we consider.

yup as H is removed and Carbon is attatched to it instead!

 

[PhyZac]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s12_qp_33.pdf
Q10 b ii knowitall10
xhizors
??

I did not do it!

 

[Ramsha007]

Please post it last time

plz anyone help me with the ratios of Nmr how do we calculate them like in low resoulution Nmr, ratios of areas under the peak or in mass spectroscopy ratios of peaks of Cl isotopes