Chemistry: Post your doubts here!

[ZaqZainab]

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

i answered Q9 already wait i will search for it and quote it
Q13 NaCl (s) + H2SO4 (l)-------> HCl (g) + NaHSO4 (s)
it does not get reduced so it is not acting as a oxidizing agent

 

[SIstudy]

btw ppl
endothermic reactions are favoured by high temp
and exothermic reactions are favoured by low temp
in equilibrium?

 

[Kamihus]

Hey
http://papers.xtremepapers.com/CIE/Cambridge International A and 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

1-Ans is B. Cl has +5 change in ClO3. Write other options down.
3-Four atoms attached in BH4 so tetrahedral. 3 in BF3 so trigonal planar.
6-Use equation pV=nRT, convert C to Kelvin.
12-In B both has 2 lone pair and 2 bond pairs.
21- Does not possess so same on both sides.
38- I think you are confused about statement 3, PCl5 or SOCl5 is the reagent.

Just revise bond pairs.

 

[Suchal Riaz]

thts the answer

If you thought that i would go away without helping sorry to disappoint you

 

[ZaqZainab]

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

Q9, Q29, 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 please !!!

here question 9

.

 

[princessnoor]

sorry can't figure it out

Ok

 

[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]

Thanku very much

View attachment 45214
If you thought that i would go away without helping sorry to disappoint you

 

[Kamihus]

http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_s04_qp_1.pdf
Q24-Ethene reacts with KMnO4 and Br2, so why B?

 

[_Ahmad]

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

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

 

[GCE As and a level]

Guys i am waiting

 

[ZaqZainab]

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

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

Q21
is C
C. and CH3. and CH3CH2.
31
1 looks like diamond
2 looks like graphite
and 3 is NaCl

 

[Kamihus]

Guys PLZ help me with this
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s12_qp_12.pdf
Q10-B
Q16-D
Q20-C
Q23-B
Q25-C
Q28-D
Q37-B

Thnx

10-A is non-polar. In D it is cancelled out. C has less difference as both are negative. B most as one negative, one positive.
16-Forms NaClO3, with hot. NaClO with cold.
23-Add H and Br to the double bonds
37-CH3CH(double bond)-CH2 so 3 can't be formed.

 

[ashcull14]

If they are attached at different side but are same, not chiral, right?

yes

 

[MiniSacBall]

Welli am sorry i don;t know where!

here question 9

 

[Kamihus]

http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_s07_qp_1.pdf
Q12- How is B even possible?
40-How does carboxylic acid react with an ester

 

[_Ahmad]

http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s10_qp_12.pdf

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

 

[ZaqZainab]

Welli am sorry i don;t know where!

quote="ZaqZainab, post: 827428, member: 32031"
:/ idk why it isnt quoting

 

[Asad rehman]

is it D

 

[GCE As and a level]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s07_qp_1.pdf
Q12- How is B even possible?
40-How does carboxylic acid react with an ester

They are my doubts too
if u got the answer tag me
Every thing is possible in chemistry