Chemistry: Post your doubts here!

[♣♠ Magnanimous ♣♠]

thx bro

No probs
Well while doing those chap refer this site too --> www.chemguide.co.uk
well it is a very complicated site so search any topic in google that you want to and after that write this site name
The first link will be of that site related to your topic

 

[RoOkaYya G]

moles kia ha answer mein,matlab wats the right answer.

wht was ur answer?

 

[bludlynsolja]

someone link to 2014 papers plz. thx

 

[Charlotte20102013]

Can someone explain this
http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_w11_qp_11.pdf
Q8 (Ans:A)
http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_s12_qp_12.pdf
Q14 (Ans:B)
Thanks!

 

[Charlotte20102013]

someone link to 2014 papers plz. thx

http://freeexampapers.automaticpapers.com/

 

[RoOkaYya G]

Can someone explain this
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w11_qp_11.pdf
Q8 (Ans:A)
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s12_qp_12.pdf
Q14 (Ans:B)
Thanks!

for Qu 14 its B because :
in reaction 1 theres bond breaking so its endo
in reaction 2 theres bond formation so its exo

for Qu 8 its A because:
it neutralises the H+ in both reactions..so its a base.
the quest is about BOTH reactions here. so A is correct

 

[manutd96]

http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_s08_qp_1.pdf

question 36, isn't it that nitrogen should have negative oxidation number as it is more electronegative hence it should be oxidised?

Ans given is c (2,3)

 

[bludlynsolja]

Thx a lot much appreciated

 

[Charlotte20102013]

for Qu 14 its B because :
in reaction 1 theres bond breaking so its endo
in reaction 2 theres bond formation so its exo

for Qu 8 its A because:
it neutralises the H+ in both reactions..so its a base.
the quest is about BOTH reactions here. so A is correct

TYVM!

 

[Charlotte20102013]

When I name an organic compound, how do I apply the numbering? Like if thrs a functional group, the numbering follows the functional group.
But what if there was 2 different functional groups in a compound, which do I follow? Like acid or carbonyl group or carboxyl group etc. Which functional group gets the priority?
Thanks.

 

[iYuuki]

Question 39
http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_w08_qp_1.pdf

Can someone help?

 

[RoOkaYya G]

TYVM!

welcome

 

[princess Anu]

Somebody please explain how to solve such Questions

 

[Maqb0ol]

Somebody please explain how to solve such Questions

Only 1 is correct. Am i right?

 

[Maqb0ol]

Somebody please explain how to solve such Questions

Only 1 is correct. Am i right?

 

[yasoob_shah]

Thts me!!

 

[Charlotte20102013]

Need a little help here guys...
http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_w12_qp_13.pdf
Q38 [Ans: B (1&2)] I know option 1 undergoes redox, but how to tell if option 2 undergoes redox?

 

[huh]

Need a little help here guys...
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w12_qp_13.pdf
Q38 [Ans: B (1&2)] I know option 1 undergoes redox, but how to tell if option 2 undergoes redox?

CH4 + Cl2 = CH3Cl + HCl
Cl2 reduced to form Cl(-).
C(4-) in CH4 oxidized to C(2-) in CH3Cl.
Hope this helped.

 

[princess Anu]

Only 1 is correct. Am i right?

Yes!

 

[Maqb0ol]

Yes!

It's easy, just follow the instructions, it says from U to R which means the direction would change (arrow) and positive enthalpy would be reversed by sign. whereas 2nd option is wrong because endothermic is donated by +ve sign