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Hello. I need help in calculations of the titration in paper 3!!!!!!!!!!
Can anyone post solved paper 3s or any help pleaasee???
Can anyone post solved paper 3s or any help pleaasee???
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yeah, you're right. it is 40. Then, I have no idea why it says 130 as maximum marks for AS.
Max marks for P3 are 40
Go Get A life Bro lolThe total marks for the syllabus are indeed 140.. but i think the weightage of P3 is 30 marks...
Look at:
23% at AS Level for P3.. That's only possible if P3 Marks are taken to be 30.
30/(130) *100 = 23%
40/140*100 = 28% .. which is wrong.
I can't say anything else.. lol
That's a clear explanation.I'm not sure how I can clarify it but have a look at the Hess's Law diagram.
And not a problem. View attachment 23047
So in this case, the reactants are C and S and product is CS2. that's why in the end, the subtracting takes place.
no problem. I'm glad you understood.That's a clear explanation.
Thanks a lot
Can you answer the question posted above please?do anyone have chemactive a level chemistry worksheets please upload it the site is down for quite a time i wanted those worksheets. and if some has chemistry mark schemes for all past papers compiled please upload
When an electron is removed from an atom, the nucleus has a stronger hold on the remaining electrons. That is why it is difficult to remove an electron when one has already been removed. This leaves us with option C and D to choose from.O/N 11/12 question 3
Can anyone who is good in chemistry solve this?
Use of the Data Booklet is relevant to this question.
From which particle is the removal of an electron the most difficult?
A Cl- (g) B F- (g) C K+ (g) D Na+ (g)
Thankyou so much but how can we be so sure in assuming that Na+ is gaseous?
D Na+ (g)
When an electron is removed from an atom, the nucleus has a stronger hold on the remaining electrons. That is why it is difficult to remove an electron when one has already been removed. This leaves us with option C and D to choose from.
Removal of an electron in the last two cases mentioned involves the second Ionisation Energy.
Use the Data Booklet to check the energy for each, K+ has 3070 while Na+ has 4560 kJ/mol. More energy means it is more difficult to remove an electron.
hahahah I am really sorry , Question STATES that it IS gaseousYou're welcome. I didn't have to assume, you wrote it
Sorry but I'm rather unsure about this one yet.View attachment 23074
Can you answer this also please? Its from the same year and variant is 13.
It's okay, with exams coming up that happens too oftenhahahah I am really sorry , Question STATES that it IS gaseous
Well another related question - Are always ions gaseous?
hahahah thats true , seriously I never felt such pressure before. I knew this too They can be aqueous tooSorry but I'm rather unsure about this one yet.
It's okay, with exams coming up that happens too often
No, they can be aqueous too.
If you did already, why askhahahah thats true , seriously I never felt such pressure before. I knew this too They can be aqueous too
in a equation how do we know which reactant on change in concentration has no effect on the rate of reaction
eg:
CH3CH=CH2 + I2 -------> CH3CHICH2I
PLZ i need to know its important
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