Qualification > Sciences

ALL CIE CHEMISTRY DOUBTS HERE !!

<< < (122/142) > >>

$H00t!N& $t@r:
i have another question.. Q28 October/November 2009 variant 12
http://www.xtremepapers.me/CIE/International%20A%20And%20AS%20Level/9701%20-%20Chemistry/9701_w09_qp_12.pdf

elemis:

--- Quote from: $H00t!N& $t@r on May 30, 2011, 08:11:28 pm ---i have another question.. Q28 October/November 2009 variant 12
http://www.xtremepapers.me/CIE/International%20A%20And%20AS%20Level/9701%20-%20Chemistry/9701_w09_qp_12.pdf

--- End quote ---

Option B is correct since, when you draw it out (see below).

It is a rearrangement of the target molecule in the question. Just substitute the Br with a COOH group.

$H00t!N& $t@r:

--- Quote from: Ari Ben Canaan on May 31, 2011, 06:01:05 am ---Option B is correct since, when you draw it out (see below).

It is a rearrangement of the target molecule in the question. Just substitute the Br with a COOH group.





--- End quote ---

Thanks I get it  :)

$H00t!N& $t@r:
More doubts..  :-\
 
October/November 2010 variant 12
Q 11, 12 and 40

http://www.xtremepapers.me/CIE/International%20A%20And%20AS%20Level/9701%20-%20Chemistry/9701_w10_qp_12.pdf

elemis:
Question 11

Y is a product. Initially there is no Y present. What does this tell you about the concentration at t=0 ?

Similarily, what concentration of X is present at t=0 ? You should now be able to eliminate 2 out the 4 options.

When equilibrium has been reached [X(aq)] has fallen to 0.25mol dm–3

Using that statement can you not calculate the moles of X and Y present at equilibrium using the given equation ?

Now calculate the Kc... It should all come together.

Question 12

This is something simple that you should be well aware of. Read your textbook.

Question 40

I'll give you a hint. Think about SN1 reactions and the formation of a carbocation....

Navigation

[0] Message Index

[#] Next page

[*] Previous page