- Messages
- 146
- Reaction score
- 26
- Points
- 28
paper 2Which paper?
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paper 2Which paper?
for question 27 i am not sure either, but B dont seem to be stable anion when donating acid..!Hi, Im having trouble reasoning and accepting the answers for questions 27. 33. 38. and 39. from this past years paper :
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w08_qp_1.pdf
Can anyone please clarify the answers (i.e. give reasons) for the questions above?
The answers are C, D, D, B.
For 27. why is the answer not B?
For 33. Why is the answer not B?
Thank you! God bless!
I don't get it after 3rd stepI can't help more than what the markscheme is providing ! if u dont understand anything in any step ask..
see.. Kc =[CO][H2O]/[CO2][H2]I don't get it after 3rd step
okay wait i will solve the math bit!yea i tried it like this but i m not getting the correct answer
ohh got my mistake thanks man(0.20+x)^2 / (0.5-x)^2 =1.44
(0.20+x)^2 = 1.44 ( 0.5-x)^2
now square root both sides and u get
0.2 + x = 1.2 (0.5 - x)
0.2 +x = 0.6 - 1.2 x
1.2x + x =0.6 - 0.2
2.2 x = 0.4
x = 0.4/2.2
x= 0.181818...
x= 0.18
CO2 + H2 <=> CO + H20here is the link help me with Q3 d part 2
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s09_qp_2.pdf
still a big thnksGuess im bit too late lol
thnxfor q 31 it wud be B??
as when the atoms become bigger the radii increase thus increasing bond length too because 2 radii make up the bond length as bond length is the measurement of length from the nuceus of one atom to the nucleus of the second atom.
and as the atom becomes bigger the attraction between the atoms decreases so the overlapping area of the radii of the atoms decreases. thus increasing the bond length... like this:
a-===-b
A---=---B
where a and b are smaller atoms
and A and B are larger atoms
and - is the part of radius not overlapping
and = is the part of radius overlapping
understood?
okay... so point 2 is incorrect cz strontium hydroxide is more soluble than calcium hydroxide.
can any 1 give explanations for the following mcqs:
o/n 2010 mcq 7 , 12, 13 ,18, 40 :
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w10_qp_12.pdf
.
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