Chemistry P4| A2 only

[aliya_zad]

how does an electron withdrawing or donating group.......affect acidity of a compound....
wht do these withdrawing and donating mean?

An electron withdrawing group like chlorine and Oxygen have high Electronegativities and tries to pull electrons towards them!
In a compound therefore the bond can break easily..electrons are accepted by the high Electronegativity groups and H+ is easily released...

 

[princesskt]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s08_qp_4.pdf
HELP ME WITH Q1 a(ii)..............plz
shouldn't it be 1.36-0.77 according to Ered-Eoxi
the correct ans is .77-1.36 in the ms

ans my ques plzzzzzzzz anyone..........

 

[smzimran]

ans my ques plzzzzzzzz anyone..........

It is written in the m.s to ignore the sign!
If you write 0.59 V, it will be correct.

 

[princesskt]

It is written in the m.s to ignore the sign!
If you write 0.59 V, it will be correct.

it will be correct but in brackets they wrote a negative sign.......shouldnt it be positive??????????

 

[smzimran]

EXACTLY. i"ve asked this question so many times. no one replied

can any one pls help with the q
how is it 1st order with respect to H+.....

You people should search answers before asking!
A little back in this very thread, someone asked also,
I had solved this back in March!
Click here

 

[smzimran]

it will be correct but in brackets they wrote a negative sign.......shouldnt it be positive??????????

In brackets it means that it may or may not be written by the student!

They have included negative but i dont exactly know why!
They also were in doubt, so they decided to give the mark to positive values as well!

 

[smartangel]

You people should search answers before asking!
A little back in this very thread, someone asked also,
I had solved this back in March!
Click here

uh okay. sorry :/

 

[princesskt]

http://www.xtremepapers.com/papers/... AS Level/Chemistry (9701)/9701_s10_qp_41.pdf
q3 (c) why dative bond can not be formed from Cl to C
plzzzzzzzzzzzz help

 

[DragonCub]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s10_qp_41.pdf
q3 (c) why dative bond can not be formed from Cl to C
plzzzzzzzzzzzz help

Here they don't need to form dative covalent bonds. Chlorine atoms each have a lone electron. They prefer to donate that one to form covalent bonds with one from carbon.

The reaction equation:
CCl2 + H2O = CO + 2HCl

 

[smzimran]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s10_qp_41.pdf
q3 (c) why dative bond can not be formed from Cl to C
plzzzzzzzzzzzz help

Carbon does not have enough orbital space to accomodate electrons of dative bond by chlorine!
It has no d orbital space!

 

[desmondyap93]

http://www.xtremepapers.com/papers/... AS Level/Chemistry (9701)/9701_w10_qp_43.pdf
Question 7 (b)
Thanks in advanced!

 

[soul1]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w10_qp_43.pdf
Question 7 (b)
Thanks in advanced!

You're welcome in advanced.

 

[optimistic]

Can someone please help me with Q3a part 1 and 2! plzzzz.....
http://www.xtremepapers.com/papers/... AS Level/Chemistry (9701)/9701_w11_qp_43.pdf

 

[desmondyap93]

You're welcome in advanced.

LOL Mind telling me how to sketch the graph?

 

[user]

hey plz.post some notes on nmr spectrosccopy...

Assalamoalaikum wr wb!

http://www.knockhardy.org.uk/ppoints.htm

^might help

 

[Amy farvin]

thanx..

 

[Amy farvin]

@user
the notes are really good.. thanx a lot.

 

[user]

@user
the notes are really good.. thanx a lot.

welcome

 

[Amy farvin]

ppl any one plz explain me this question 6(d) http://www.xtremepapers.com/papers/... AS Level/Chemistry (9701)/9701_s10_qp_42.pdf

 

[zenyatales]

please post a link if anyone has the O/N 2011 ER ?