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kingpong
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#21
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#21
(Original post by zazy)
Tell me about it..I have physics synoptic on monday and chem is a definite requirement for me...so far managed revising unit 5 by studying 12 pages a night but can't find any time to revise the synoptic stuff......
Metal extraction seems a favourite from what I've seen.


Apparently the papers were too hard last year so they are making them slightly easier this year, yay.
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zazy
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#22
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(Original post by kingpong)
Metal extraction seems a favourite from what I've seen.


Apparently the papers were too hard last year so they are making them slightly easier this year, yay.
really?If so i will die of joy....
BTw, i have two questions that i couldn't find reliable answers for...
1-why are aluminium and silicon chloride insoluble in water?
2-why is sulphur dioxide in the gaseous state whereas sulphur trioxide is liquid?
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kingpong
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#23
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#23
(Original post by zazy)
really?If so i will die of joy....
BTw, i have two questions that i couldn't find reliable answers for...
1-why are aluminium and silicon chloride insoluble in water?
2-why is sulphur dioxide in the gaseous state whereas sulphur trioxide is liquid?
2-Sulphur trioxide can form 3 hydrogen bonds per molecule, so is going to be more stable and thus have a higher boiling point.
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tammypotato
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#24
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#24
(Original post by zazy)
Tell me about it..I have physics synoptic on monday and chem is a definite requirement for me...so far managed revising unit 5 by studying 12 pages a night but can't find any time to revise the synoptic stuff......
i havent started to luk at 5 so im kinda dead!!! i need 2 do all the calculation and NMR now then i have 2 learnn all the mechanism! :*(
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spali
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#25
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logically, for the synoptic parts they arnt guna ask hardly nefing from C1 as its too easy!! or C4, there will be some as its hard but they will assume most people will have just take it so will know it pretty well so there shouldnt be too m uch in it. i think its gota be C2 and C3 we should concentrate on!
i got C4 retake today-eeek! i suk at spectroscopy but i got an ok grade last time so its not the end of the world, jus helps with synoptic.
if people are worried bout C5, ive done my notes on them all and its not as bad as it first seems. there are only a few key ideas to know- cell potentials, gibbs and entropy, how shell splits=colour, catalysts arnt too bad. but u must concentrate of the colours and the variable colours you get with some when you add zinc and hcl!
there, thats it!
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kingpong
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#26
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#26
(Original post by spali)
logically, for the synoptic parts they arnt guna ask hardly nefing from C1 as its too easy!! or C4, there will be some as its hard but they will assume most people will have just take it so will know it pretty well so there shouldnt be too m uch in it. i think its gota be C2 and C3 we should concentrate on!
i got C4 retake today-eeek! i suk at spectroscopy but i got an ok grade last time so its not the end of the world, jus helps with synoptic.
if people are worried bout C5, ive done my notes on them all and its not as bad as it first seems. there are only a few key ideas to know- cell potentials, gibbs and entropy, how shell splits=colour, catalysts arnt too bad. but u must concentrate of the colours and the variable colours you get with some when you add zinc and hcl!
there, thats it!
Yeah C1 stuff seems relatively non-existant in c5, you shouldn't really have to revise it much anyways, it's that easy.

They seem to like to stick in some reactions of halides with sulphuric acid questions, so make sure you know the products and oxidising/reducing trends.
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tammypotato
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#27
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which mechanism do we know exactly 4 module 4plzzzz
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kingpong
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#28
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#28
(Original post by tammypotato)
which mechanism do we know exactly 4 module 4plzzzz
Errrr pretty much all of them???

Benzene mechanisms are easy electrophilic substitutions and they're a large proportion of what we need to know.
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zazy
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#29
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so why is Alcl3 insoluble then?
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kingpong
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#30
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(Original post by zazy)
so why is Alcl3 insoluble then?
I thought it was :/, or at least it reacts with water, that's why you have to keep reaction conditions free of water.
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zazy
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#31
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(Original post by kingpong)
I thought it was :/, or at least it reacts with water, that's why you have to keep reaction conditions free of water.
but there was an actual question about it...was it because the ions aren'f fully seprated or something to that effect...?
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kingpong
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#32
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(Original post by zazy)
but there was an actual question about it...was it because the ions aren'f fully seprated or something to that effect...?
Which paper/question?
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