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Anyone doing paper 32 on the 28th?
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34Anyone doing paper 32 on the 28th?
Any expected practical in 34? By your teacher?
I literally have no idea.Any expected practical in 34? By your teacher?
Is it B?Could anyone please explain what the question asking exactly and how to do it?
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Heyy thank you so much....yes you're right, its BIs it B?
If so, what I think is this,
we know the Mr of KNO3 is 101.1 , and they gave us the actual mass so we know we have 1 mole of KNO3. To define Mr, we say it's the mass of particles that have the same no of atoms as in C-12 isotope, basically its the mass of a particle when it's one mole. Since we know we have one mole of KNO3 this means that the actual mass of nitrogen is 14g
looking at the Mr of urea, the Mr is 60g, if we take 60g (Actual mass) then that means the actual mass of nitrogen is 28g since the number of moles is (60/60) and we want half the 28, so this means if I take 30g actual mass, my number of moles will be (30/60) so that multiply by urea equation means I have 14 g nitrogen since I'm halfing the equation.
Was this right ? helpful?
I need genuine help here,
I don't understand option C, I said A because I confused with C, the actual answer is B (btw this is section B) so one and 2 only are right
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Hello everyone!
could anyone please explain to me how the answers are begin obtained in the following qns.
qn6.-A
qn9.-B (is there a shorter method except trial and error)
qn28.-C
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For Q8 C2O4 has an overall charge of 2- since Oxygen will give - 8 charge you will have to +6 to make the overall charge to 2-,therefore each atom of C will have +3 charge and its oxidation as the the oxidation state changes from +3 to +4.Hy
Could anyone explain how to get answers to the following
8-A
18-D
39-B
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This is from........may june 2018 qp 11What years are these question from?
Wasnt this IGCSE??Is electrolysis of brine and extraction of Aluminium in the syllabus for chem p1??
Thank youFor Q8 C2O4 has an overall charge of 2- since Oxygen will give - 8 charge you will have to +6 to make the overall charge to 2-,therefore each atom of C will have +3 charge and its oxidation as the the oxidation state changes from +3 to +4.
For Q18 you'll have to make equation of decomposition for each nitrate and use the total mass of gas obtained of No2 and O2 which is 108g and solve by mass ratios.
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