Chemistry: Post your doubts here!

[Hinafatima]

You have to open the past paper in a new tab, and click on the address bar, and copy the link from there. Then you paste it here.

But on xtreme papers may June 2014 papers are not available , I have just checked it.

 

[Dark Destination]

But on xtreme papers may June 2014 papers are not available , I have just checked it.

You'll have to use a website where they are available.. gceguide something.. is the name of the website with 2014 papers..

 

[Syed Fakhar Hussain]

Have you tried any youtube videos?
I think they'll help.

Ok .Lets give 'em a try !

 

[DeadlYxDemon]

Need Help!!!

- 3 a..
- 3b



- 3 c (ii)
- 3 d (i)
And



- 3 d (ii)

 

[Snow Angel]

Please can someone show as to how to draw the diagram for the following question - q 1d) from: papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w12_qp_52.pdf

Thanks in advance

 

[Bhargav Poudel]

MJ 2004 P1 Q28,30,39. Anyone?

 

[Hinafatima]

 

[Hinafatima]

Need help for this question please ?

 

[Bhargav Poudel]

Hinafatima Answer is B. 0.1 mole of Propanol uses 9/20 mole of 02. 12dm3 is 0.5 mole, so 0.05 is unused. The 0.45 mole of used O2 gives a certain mole of CO2, which you can convert into dm3 and add the dm3 of 0.05 unused mole of O2.

 

[Hinafatima]

Hinafatima Answer is B. 0.1 mole of Propanol uses 9/20 mole of 02. 12dm3 is 0.5 mole, so 0.05 is unused. The 0.45 mole of used O2 gives a certain mole of CO2, which you can convert into dm3 and add the dm3 of 0.05 unused mole of O2.

How come 9/20 mole?? can you please expalin?

 

[Hinafatima]

How come 9/20 mole?? can you please expalin?

Oh , ok I have got the answer, thank you so very much for the help you extended

 

[DeadlYxDemon]

Need Help1 How to do this? I really have no Idea!

 

[DeadlYxDemon]

Need Help! How to do this? I really have no Idea!

 

[Areeb Mohsin]

Does anybody know how to calculate Equilibrium Moles in a Kc question
Pls tell me as soon as you can
its URGENT

 

[Mayisha M]

Does anybody know how to calculate Equilibrium Moles in a Kc question
Pls tell me as soon as you can
its URGENT

The formula for Kc is Kc = ([H+][anion])/[acid]
I'm not entirely sure what kind of math you're stuck in but if you post the question, I might try to solve it for you.

 

[DangerXJeff]

Hey guys! i have a doubt in 9701_s04_qp_2 question (3)(c)(iii) please help! Thanks in advance

http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_s04_qp_2.pdf

 

[shazmina]

Assalamu Alaikum Warahmathulahi Wabarakathuhu

Can any one please explain me this Question................

The Answer is B....
Im pretty sure that the answer wont be Either C or D but i just have a doubt like why wouldn't it be A .. Confused... Please Help!!!!!!!1
Thanks in Advance

 

[The Sarcastic Retard]

Doubt. Whole b part. Ty.

 

[manya]

can someone explain me this question
What is the electronic configuration of an element with a second ionisation energy higher than that of each of its neighbours in the Periodic Table?
A 1s2 2s2 2p6 3s2
B 1s2 2s2 2p6 3s2 3p1
C 1s2 2s2 2p6 3s2 3p2
D 1s2 2s2 2p6 3s2 3p3

 

[Charlotte20102013]

Can someone help me with this question please

Calculate the pH of a mixture of 25cm3 of 0.1M Ca(OH)2 and 20cm3 of 0.1M HCl.
I was given the answer 12.82 but I'm not sure if it's the correct one.

Thank you!