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Can someone please explain Q5) c)i) of http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_s08_qp_2.pdf
Pleaseee
Pleaseee
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Can someone please explain Q5) c)i) of http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s08_qp_2.pdf
Pleaseee
in this one, H2PO4- ats like a base and donated electron and HPO4-2 acts as an acidCan anyone help me with this questions?
View attachment 37561
structure of ice is very simplePlease can anyone help me to explain the structure of ice. I had a bad chemistry teacher
Please one more question Why it is tetrahedral while in liquid it is bent??structure of ice is very simple
it only have 2 bondings in it, covalent and hydrogen bonding
when water is freezing, these Hydrogen bondings arrange themselves in a hexagonal structure and form rings,giving ice an expanded volume and a fixed shape
your answers are kind of long to answer and i cant draw it's shapes over here, but i'll tell you the method
in this one, H2PO4- ats like a base and donated electron and HPO4-2 acts as an acid
the trick is that when a buffer reacts with an acid or a base, the product include the reactent of the other (this is some thing that i have noticed and is not a given rule, watch in the example)
H+ + HPO4-2 ----------> H2PO4-
now
OH- + H2PO4- ---------> HPO4-2 + H2O
as for the part (iii)
you need to use the formula for acidic buffer solutions to find it's pH, which is
pH = pKa + log ( [salt]/[acid])
for pKa u use the value of 7.2, (sorry about this part im a little confused as to how to explain it, form what i remember, i took out the no. of moles of [H+] and used them again in pKa= (-log[H=]) equation and got 7.2 as answer so that's why you have to use 7.2, thought im still not 100% on that, sorry,)
can you give me the paper no. or this, i'll try solving it once more and see if i can answer it
what was your paper no.?Help me too
about the acid or base part we have to see if the molecule is giving protons or accepting protons, H+, so it have to do with bronsted lowery base and acid definitions!!Still I didnt get even a word of it
How we'll know that what is acid and what is base from the data given in this question ?
I think so it was from 06m/j or from 09 nov var (41)
my bad http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_s03_qp_2.pdfwhat was your paper no.?
5 a make propene which is C3H6 The pic has the structural formula
when we react an aldehyde with Kr2Cr2O7, it gets oxidised and form -COOH (carboxylic acid)Can someone please explain Q5) c)i) of http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s08_qp_2.pdf
Pleaseee
the answer is AI want quick answer for paper1 june 2007 q.9 only
ok what about 7a i5 a make propene which is C3H6 The pic has the structural formula
so you just have to break the double bond and repeat the same thing 3 times
thats all
The general formula for ester is there in the pic It is always suppose to be there in an ester if it isn't then that is not an ester View attachment 37732ok what about 7a i
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