Chemistry: Post your doubts here!

[qwertypoiu]

I don't understand the concept behind s,p,d sub-shells and orbitals and also the Aufbau principle. Can any please explain the basics?

Have a read through this page:
http://www.chemguide.co.uk/atoms/properties/atomorbs.html

 

[AnonymousX9]

Have a read through this page:
http://www.chemguide.co.uk/atoms/properties/atomorbs.html

I did and I still don't understand it properly.

 

[qwertypoiu]

I did and I still don't understand it properly.

Well I'll be straight with you. That website, chemguide, is one of the best websites I've seen for chemistry. In fact, you can rely just on this one website for all your a level needs. However, it is true that students have different learning types. Some are visual learners, others need ppl to explain orally, etc.
I think it's difficult to explain whole concepts by typing here. You should go talk to your teacher. Go sit down with him and let him explain everything till you get it. Or perhaps a knowledgeable classmate. Or a senior student. Hope you learn it well

PS. If there is a specific paragraph from the link you didn't understand, just quote it and explain what you don't get, I'll try my best to elucidate.

 

[bubbles1997]

where can I find sir zahid warriach A2 worksheets?

 

[Jake09]

Can anyone help me in any of these questions, I checked the mark scheme and examiners report but still very lost

9701_11/s14 - http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_s14_qp_11.pdf
3,6,9,13,18,34,35 (not being lazy, honestly cnt solve these)

cheers

 

[Umna.Asim]

Anyone got topic wise past papers to share for chemistry?

 

[My Name]

Anyone got topic wise past papers to share for chemistry?

https://www.xtremepapers.com/community/threads/as-chemistry-topical-finally-here.23520/
AS^
https://www.xtremepapers.com/community/threads/a2-chemistry-topicals-here.30502/
A2^

 

[22shimmer22girly]

As or A2

a2

 

[22shimmer22girly]

please help wid my with my why questions...on the group

 

[psychiatrist]

Metanoia or anyone else, help me remembering As level inorganic stuffs, that are chapters, Periodicity, Group II and VII and sulfur and nitrogen...
Just temme what is importantand what is the trick to remember those stuffs. Thanks.

 

[Metanoia]

Metanoia or anyone else, help me remembering As level inorganic stuffs, that are chapters, Periodicity, Group II and VII and sulfur and nitrogen...
Just temme what is importantand what is the trick to remember those stuffs. Thanks.

Its not easy to say what is important or not.

Its best for you to look through the objectives listed for the respective chapters and make sure you understand the requirements.
http://www.cie.org.uk/images/128593-2015-syllabus.pdf

If any objective seems unfamiliar, its an indication you need to revise that particular concept.

 

[Sarosh Jameel]

plz someone tell me that how big the tangent should be when calculating rate of reaction from the graph ??

 

[Uttam Shrestha]

Check this site to do MCQs and check answers easily and you can find pastpapers more easily. Its free. http://studyguide.cf/ Hope it will be helpful.

 

[manya]

plz tell me why the peak at 4.1 corresponds to a R-CH3 group

 

[Sarosh Jameel]

PLZ someone help with part (II) (III) and (IV) PLZZ !!!

 

[manya]

PLZ someone help with part (II) (III) and (IV) PLZZ !!!

i may not be right but let me try
see if u add Na2SO4 on the left hand electrode, its going to dissociate this way
Na2SO4 _____ 2Na*+ + SO4*2-
the solution in the beaker are this way
fe2so4 = fe2+ +so4*2-
feso4 = fe*2 + so4*2-
an increase in conc of so42- will shift the equlibrium of both the ions towards the left so the conc. of fe2+ and fe3+ increases in the same way therefor no change in emf

however in the case of agso4, the solution is as follows
agso4= ag+ +so42-
increase in sulphate conc will shift the equilibrium towards the left decreaing the concentration of ag+ so the Eelectrode will decease decreasing the overall emf

 

[Rectified Spirit]

Hi friends pls can anyone help me to understand how the Ksp is calculated here.....Oct 10 p41

 

[Serial_Ripper]

Hello, can you please tell me if it's possible to finish paper 5 in a week? given that at the beginning of said week I never opened any paper and at the end of the same week is the actual exam i.e. 30 October - 5 November?

 

[eliyeap]

Hi friends pls can anyone help me to understand how the Ksp is calculated here.....Oct 10 p41[/QUOTT
The formula for Ksp is like the formula for equilibrium constant. Ksp= (Cl-)^2(Pb2+)/(PbCl2). The unit would be mol^2dm^-3

 

[Rectified Spirit]

Thanks dear for your answer, but I was specifically needing help for no. 2, I don't know how to make [Pb2+] equal to [Cl-]. I hope you understand when the power is 1 for the concentration I can calculate it easily but I am having problem when there is a power greater than 1...........waiting for your response