All Chemistry A2 students, the planning question this summer... Watch

angeleyes2
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#181
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#181
yeahh do u think that we r guna get a mass spectrometer or are we likely to get the uv one cuz gp 1 gt mass spectrometer we probably get that 2
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ATESalisbury
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#182
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#182
nah its gotta b mass spec i dunno wot im gonna do if its not, i aint revised none of the other 2/3 woteva!!!

I only think its nickel cos im guessing with no foundation to base my guess on, hence i thought u'd done the same thing orangemonkey - but i was wrong! hahahaha...........ok........... good work
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Jan Da Man
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#183
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#183
i swear every1 got a sheet tellin them wat will com up
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=Keith=
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#184
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#184
ahh.. kinda scared now.. i was ok all this time..
No shihab i dont really have any idea wats definately coming. I just have the general view as everyone else has.
Between.. does Pb has "same" reactions with NH3 and NaOH? exactly the same?
Plus can u guys tell me.. wats are the confirmation tests for the ketone. im not clear in this thing.
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orangemonkey
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#185
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#185
dont get scared ppl
i doubt it will be much harder than group 1s practicals
i only know the mass spectrum thing to determine the structure
and they prob will keep that the same
yeah pb does
its in that booklet of information of the chemical tests they give at school
and
ketone is
the 24dnp
then iodoform(cos this on its own, if a postive result ie yellow ppt mean it could be a alcohol or ketone)

and it could be anything so dont take my crap advice in too much
lol
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Jan Da Man
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#186
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#186
warm solution with ammoniacal silver nitrate solution ... aldehydes give a silver mirror n ketones have no reaction
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=Keith=
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#187
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#187
yeah thats the one i was confused bout
thanks ppal
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ATESalisbury
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#188
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#188
carbonyl colour change with 2,4-dnp is from green to orange right?
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=Keith=
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#189
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#189
NO
Orangish Yellow ppt for + result of 2,4 DNP this means its a carbonyl (aldehyde OR ketone)
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mizfissy815
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#190
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#190
carbonyl colour change with 2,4-dnp is from green to orange right?
Nope...That's teh colour change for dichromate. When a substance(primary or secondary alcohol or an aldehyde) is oxidized it turns from orange to green.

2,4 DNP produces an orange ppt. wiht carbonyl compounds.
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angeleyes2
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#191
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#191
BTW are they likely to give us aromatic compounds to identify such as phenols???amines e.t.c. acid chlorides?
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ATESalisbury
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#192
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#192
i hope not angeleyes, but I don't think so. Today's group got an ester? It was so obvious cos when u went past the lab where the practical was taking place it smelt niiiiiiice! Anyway I dunno if they'll change that ester tomorrow, maybe to something like an amine which is another smelly-identifiable thing.
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angeleyes2
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#193
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#193
yh same here man btw tanya r u going to lsop to study pharmacy cuz is my firm choice lol i mite c u ther
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ATESalisbury
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#194
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#194
yh i accepted firm too. But this B in chemistry is starting to look pretttttty elusive, especially when I forget simple things like muddling the dichromate test with the DNP one (as above). Thanks for explaining that usman and mizfissy, otherwise I would have carried on living a chemistry lie.....haha
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