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Sorry I couldn't reply in time and i guess ptet.chemistry explained it well enough but still if you don't understand it you can ask.Help please!!!
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Sorry I couldn't reply in time and i guess ptet.chemistry explained it well enough but still if you don't understand it you can ask.Help please!!!
I believe this site has all the resources you'll need:Does anyone have topical CIE A level chemistry past papers?
This is a biology question, the answer is disulfide as it is covalent and breaks last.View attachment 65374Help please
Check out my full Paper 1 tutorials, and enjoy my take on thinking out loud through the different papers. It is more important to be able to work things out than simply doing without understanding why and the how.Anyone doing CIE Chemistry variant 13?
thank youuuuuView attachment 54323
For optical isomerism, you need a carbon with a chiral center ( 4 different substituents on the C)
As you can see only 1,2 and 3 have a chrial carbon (marked red)
So it is B
You can view as and a level chemistry notes here https://mathsmadeeasy.co.uk/a-level-chemistry-revision/Can any one help me in getting chemistry an physics notes? plz its urgent! God bless you guys. thnx :friends:
in diagram 1, the higher temperature must be Q due to more molecules with high energy/ energy greater than ea, and less molecules with low energy.http://www.xtremepapers.com/CIE/Interna ... _qp_11.pdf
number 4. Why is the answer C and not D? With a catalyst, activation energy is lowered isnt it? ardon:
http://www.xtremepapers.com/CIE/Interna ... _qp_11.pdf
number 4. Why is the answer C and not D? With a catalyst, activation energy is lowered isnt it? ardon:
If you had done any A Level titrations, you should be aware of what concordant titres within +/-0.10 cm3 is the maximum acceptable. You are going to be marked within that margin relative to that of your teacher/centre supervisor who has to do the titration using the same batch of chemicals you did, and that is how titration accuracy marks are marked. Looking at the five readings, you should be able to see that reading 1 is comparatively different from the others. I didn't check all the titres, I just quickly glanced over them, so you get to them again.i have attached two files here: a question paper and its markscheme. Please do help me with number 6b as soon as possible. Why 19.10 (which I think is got directly from the titre of titration 5). Why not sum up all titre values then divide by 5, I had got 19.23? How am I calculating wrong, or where am I not understanding the question?
i wasn't able to find even a cluehere, can somebody explain me question 16 part (c) ??
the markscheme answer is pentane.
its BView attachment 64351 Can anyone solve this, please?
Its BView attachment 64351 Can anyone solve this, please?
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