Chemistry Paper 4-theory- doubts =D

[Anika Raisa]

iKhaled & PhyZac i gs ms is wrng cz i dnt c y it will be 2!

Btwn PhyZac i m sorry i didnt get wat u said!

 

[PhyZac]

come on...it is so clear.

Suspect 2 clearly, has similar fragments as crime scene 1

Yeah suspect 2 is a perfect match for crime scene 1 but not all of suspect 1's dna was found in either crime scene.

Anika Raisa

MS is not wrong.

 

[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!