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how was chemistry p42?

how was the paper

  • super easy

    Votes: 5 11.9%
  • easy

    Votes: 9 21.4%
  • average

    Votes: 13 31.0%
  • hard

    Votes: 7 16.7%
  • very hard

    Votes: 4 9.5%
  • it was a nightmare

    Votes: 4 9.5%

  • Total voters
    42
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158
Reaction score
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no3- = fertiliser
po43- = detergent
so2 = contact process
difficulty in removing no3- = all of its compounds are soluble in water . cannot be precipitated
ion removed on addtion of caco3 = ba2+ and pb2+
though i found it strange that there was both ba2+ and so42-
interaction = van der waals forces between side chain of valine
and hydrogen bond between amide linkage
 
Messages
42
Reaction score
11
Points
8
no3- = fertiliser
po43- = detergent
so2 = contact process
difficulty in removing no3- = all of its compounds are soluble in water . cannot be precipitated
ion removed on addtion of caco3 = ba2+ and pb2+
though i found it strange that there was both ba2+ and so42-
interaction = van der waals forces between side chain of valine
and hydrogen bond between amide linkage

why ba2+ and pb2+?
 
Messages
158
Reaction score
55
Points
38
guys for the pH question. was it 100cm^3 of 0.5moldm^-3 acid or simply 0.5mol in 100cm^3?
 
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About the polymer, it was addition. I'm pretty sure because it has already come out in past paper. :) btw, what did you guys answer in the design material question, it was about what can be removed with caco3 ...?
 
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5
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18
in reactivity series Ca is found at the top of Pb and Ba so it would displace them from their ions...*i think*
Lead and barium cations wud form insoluble carbonates and sulfate would form the insoluble calcium sulphate so it can be removed
 
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Points
18
About the polymer, it was addition. I'm pretty sure because it has already come out in past paper. :) btw, what did you guys answer in the design material question, it was about what can be removed with caco3 ...?
The following question, about how does the polymer absorb water, I drew hydrogen bonds between water and the polymer..but I wasn't sure what to do with the Na+ ion in the polymer...I replaced it with a Hydrogen from the water ....
 
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18
How did you guys do the Bronsted lowry question? I think it was the worst question of the entire paper ....

And what other product formed in the organic question ....the last Q in section A ...
 
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Tha
How did you guys do the Bronsted lowry question? I think it was the worst question of the entire paper ....

And what other product formed in the organic question ....the last Q in section A ...
That quest was wierd just random stuff dont remmb how did u guys do the first quest first part the electrons one i was confused how would chlorine form negative icon when nitrogen is making coordinate covalent bond lol
 
Messages
67
Reaction score
66
Points
28
How did you guys do the Bronsted lowry question? I think it was the worst question of the entire paper ....

And what other product formed in the organic question ....the last Q in section A ...
What is this na+ iom quest ?? It was never completly in the monomer as I recall
 
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Tha
That quest was wierd just random stuff dont remmb how did u guys do the first quest first part the electrons one i was confused how would chlorine form negative icon when nitrogen is making coordinate covalent bond lol
It was NH3 reacting with HCl. So H-Cl bond was broken and the chlorine got that extra electron to form the -ve ion from the hydrogen atom. The H+ then formed the coordinate bond. I guess you didn't read the question properly. That reaction (between NH3 and HCl) was the question's first line.
 
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The following question, about how does the polymer absorb water, I drew hydrogen bonds between water and the polymer..but I wasn't sure what to do with the Na+ ion in the polymer...I replaced it with a Hydrogen from the water ....
I wasn't sure of this one either. I simply showed an ionic type interaction between the Na+ and the delta -ve oxygen and COO- and the delta +ve hydrogen. Although you may be right because the Na+ ions may leave the polymer on adding it to a solution.
 
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