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http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s11_qp_22.pdf
umm frst question b ii) ? how did we get da answer
smbdy?
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http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s11_qp_22.pdf
umm frst question b ii) ? how did we get da answer
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s11_qp_22.pdf
umm frst question b ii) ? how did we get da answer
The examiner isn't there to punish you, they are there to test your knowledge, they will accept both because they are both correct
The mole ratio of HCl and NaOH is the same, in the reaction:
NaOH + HCl --> NaCl + H2O.
So the number of moles of NaOH reacting with the HCl is the same as the no. of moles of HCl we used; 0.005. (In the question, we are told that we used 0.005 mol of Hydrogen Chloride. As the NaOH is in excess, all of the HCl will react with it - 0.005 mol of HCl and 0.005 mol of NaOH react to produce 0.005 mol of NaCl and water each).
thnx and da c) part as well plzz
no it wasnt mentioned heat under reflux the compound was given and i had to give the structural formula of the product formed on reaction with hot kmno4/H+Not if its heat under reflux. HOOCCOOH is what will be formed.
this is formed but it's oxidation occur and the end product is HOOCCOOH...
Thank youuu..Not if its heat under reflux. HOOCCOOH is what will be formed.
eee jazakaALLAH khair lol m blind :/This one's a bit difficult... I dislike Equilibria. >_<
From (b)(iv) we know that 0.04 of NaOH reacted with the ethanoic acid; NaOH is ROH in the table. As the mole ratio of CH3COOH and NaOH is the same, 0.04 mol of NaOH react with 0.04 mol of CH3COOH.
This leaves behind 0.10 - 0.04 = 0.06 mol of CH3COOH and NaOH at equilibrium. So write 0.06 under CH3COOH and NaOH in the table.
That 0.04 mol which dissociated from CH3COOH and NaOH will form 0.04 mol of the products; 0 + 0.04 = 0.04. So each of the CH3COONa and H2O has 0.04 mol; write 0.04 mol in the table under their respective headings.
And you're done with (c)(i). For (c)(ii), simply use the way of finding Kc, and you have the concentrations, so do a simple calculation in the Calculator and you're done.
Hope that helps insha'Allah.
no it wasnt mentioned heat under reflux the compound was given and i had to give the structural formula of the product formed on reaction with hot kmno4/H+
is my answer right?
yesss its rytno it wasnt mentioned heat under reflux the compound was given and i had to give the structural formula of the product formed on reaction with hot kmno4/H+
is my answer right?
um is it He? sory m not surewhich gas deviates more from the ideal behaviour He,N2,CO2,CH4
Anyone ?
i think N2which gas deviates more from the ideal behaviour He,N2,CO2,CH4
Anyone ?
He is the most ideal gas lol.....um is it He? sory m not sure
which gas deviates more from the ideal behaviour He,N2,CO2,CH4
Anyone ?
ok wats da answer??
okayzOf the most ideal gas?
CO2. I wrote that above.
CO2 as it has the greatest number of protons and electrons in the molecule, thus the greatest van der waal forces of atractionwhich gas deviates more from the ideal behaviour He,N2,CO2,CH4
Anyone ?
I think A*s are awarded based on being in the top few percent of highest marks, if two people have the same marks, and one put COOH, and the other put CO2H, they would both get the same grade. An A* just means you got a really high markThey will accept both, but they will be more inclined to award an A* to the one they preferred and was correct, than the one that they accepted because it was just correct.
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