Chemistry: Post your doubts here!

[SIstudy]

it can be aldehyde or ketone. both contain only one C=O

it could be an aldehyde rite?
but according to the answer its sayin tht this result cant be obtained :'( :'(

 

[ZaqZainab]

sorry wrong answer.
correct answer is that as the molecular formula shows that there are 4 carbon and 10 hydrogen, it must be an alcohol as any C=O will decrease the number of hydrogen by 2. it has general formula CnH2n-2O. ketones/aldehydes have formula CnH2nO

You really need some sleep or maybe just coffee will do

 

[$$AK$$]

Hey
http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_w12_qp_11.pdf
Q1-C
Q3-D
Q6-D
Q11-A
Q12-B
Q17-D
Q21-D
Q24-C
A26-C
Q38-B
plz I NEED HELP

 

[princessnoor]

i don't understand your question. what is for and what is x2/4(b-x)2

thts the answer

 

[Kamihus]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w11_qp_11.pdf

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

Q13? You sure?

 

[ziremm]

hello guys can you please help with these questions ASAP :/
q1,4,9,19,23,39,36,33
thanks a lot

question paper: http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_w07_qp_1.pdf

mark scheme : http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_w07_ms_1.pdf

 

[MiniSacBall]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s07_qp_1.pdf

Q9, Explain plz


http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s10_qp_11.pdf
Q13

Also, how does it hydrochloric acid behave as acid when it is added to NaCl,
And H2SO4 conc. is used for hydrolosis or dehydration, and what about NaOH,

I need urgent help !

I am really sorry to tag you but i have an urgent stituation here, i have hardly 5 minutes before i have go offline
Suchal Riaz ZaqZainab

 

[ZaqZainab]

thts the answer

what do you mean x2?

 

[ZaqZainab]

Q13? You sure?

i am guessing he means 14

 

[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?

 

[princessnoor]

i don't understand your question. what is for and what is x2/4(b-x)2

here u go question 11 ppr http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_w02_qp_1.pdf
answer is D

 

[MiniSacBall]

Q13? You sure?

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

 

[princessnoor]

what do you mean x2?

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

 

[AhsanAfzal]

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

 

[..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