Chemistry: Post your doubts here!

[..sacrifice4Revenge..]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w09_qp_11.pdf
Q18 hydrocarbons are present in catalytic converters??????
and someone pls explain Q19 too

the question says removed, not present..

 

[princessnoor]

Can you tell the paper?

http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_w02_qp_1.pdf
question 10 also plz

 

[SIstudy]

ZaqZainab
so Ionisation energy affects b.pt?

means if I.E is high, the b.pt will be high?

 

[Kamihus]

Sorry it is
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s11_qp_11.pdf

Q13, i don't how to get this, i have got volume as 60 cm3, how is it 30 cm3
M/J 2011

0.01 mol of Al2O3 is formed. It reacts with acid in 1:6 ratio with HCl. Volume will be 30 cm^3. 60 when H2SO4 but minimum so we can take HCl

 

[..sacrifice4Revenge..]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w02_qp_1.pdf
question 11 answer is D

im not sure
but since both H2 and I2 are diatomic, there ought to be 4 atom of them altogether..

 

[..sacrifice4Revenge..]

ZaqZainab
so Ionisation energy affects b.pt?

means if I.E is high, the b.pt will be high?

the relation is made for just group 2 in our case
just remember, in group 2, both IE and Mpt decrease down the group

 

[_Ahmad]

Sorry it is
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s11_qp_11.pdf

Q13, i don't how to get this, i have got volume as 60 cm3, how is it 30 cm3
M/J 2011

i think you used V=n*24 for finding volume instead of V=n/C

 

[SIstudy]

the relation is made for just group 2 in our case
just remember, in group 2, both IE and Mpt decrease down the group

yu mean group 2 is an exception?

 

[Kamihus]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w09_qp_11.pdf
Q18 hydrocarbons are present in catalytic converters??????
and someone pls explain Q19 too

18: Just learn this and their reactions.
19: N2H4-CO is formed. NH4 and other ion is required so has to be CNO-

 

[$$AK$$]

Guys plz help me
even if only few Qs

 

[..sacrifice4Revenge..]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w09_qp_11.pdf
Q18 hydrocarbons are present in catalytic converters??????
and someone pls explain Q19 too

for 19,
u know that cyanate is CNO..
so
in the compount shown
you see two Nitrogens, our product should also have 2 N in ammonium cyanate.
so it has to be A, cz if its B, it will make 3Nitrogens.

 

[SIstudy]

http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_s11_qp_12.pdf
Q1 (B)
like how?? in the question itself its mentioned tht it is an isotope meaning tht the number of neutrons is different :/

 

[..sacrifice4Revenge..]

yu mean group 2 is an exception?

no
for AS, group 2's trend of dec IE and Mpt has to be known only.
like that they decrease down the group.

 

[..sacrifice4Revenge..]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s11_qp_12.pdf
Q1 (B)
like how?? in the question itself its mentioned tht it is an isotope meaning tht the number of neutrons is different :/

look closely,
its He and H.
not isotopes of H

 

[ZaqZainab]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w02_qp_1.pdf
question 11 answer is D

sorry can't figure it out

 

[ZaqZainab]

ZaqZainab
so Ionisation energy affects b.pt?

means if I.E is high, the b.pt will be high?

No there is no actual relationship between B.pt and ionization energy

 

[_Ahmad]

http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_s10_qp_11.pdf

Q21(B),31(B),40(D)

 

[SIstudy]

look closely,
its He and H.
not isotopes of H

Oh Maiii Goddd how could I do this :/ silly me
thank yu
Jazak'Allah

 

[SIstudy]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w11_qp_12.pdf
Q9 (D)
I could make out tht glucose and fructose are structural isomers so option A and C is ruled out but cant understand how osmotic pressure is affected?

 

[NinjaXM]

How can you solve question 21 of this http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_w06_qp_1.pdf
Without having to draw all of them and waste time.
Please help, I can't figure a way out.