WHine about A level 2006
-
ratio of an angle measured in degrees to 2(pi) ... dunnoe, anyhow humptum ...Originally posted by d3sT1nY:
How to define radian..?
Hmm, this definiton ??? http://dictionary.reference.com/browse/radian
Physics P1 damn difficult, cannot confirm the answer correct or not ... wtf ... there goes another B .... -
today's chem paper tricky but manageable
-
Hmm, like tt, chem sounds like free frag like tt ...Originally posted by ctstalin:today's chem paper tricky but manageable -
Today's paper also die liao..
What's the anion in the complex ion..?
Why the reaction is feasible though it's energetically unfavourable..?
And I dont know all the definitions..
Die liao die liao.. -
my fren say the anion is AlF something, but i wrote Na3F6^2-...dunno lahOriginally posted by d3sT1nY:Today's paper also die liao..
What's the anion in the complex ion..?
Why the reaction is feasible though it's energetically unfavourable..?
And I dont know all the definitions..
Die liao die liao..
the 2nd qn i wrote KI was added in excess
tricky paper... by the way was the mechanism for both hydrolysis of CH3CH2Br same as that of CH2CHCH2Br? -
Different leh.. Because for CH3CH2Br.. It's SN2.. Then CH2CHCH2Br is SN1 deducing from the rate equation.. Because the OH is not inside the rate equation..Originally posted by ctstalin:my fren say the anion is AlF something, but i wrote Na3F6^2-...dunno lah
the 2nd qn i wrote KI was added in excess
tricky paper... by the way was the mechanism for both hydrolysis of CH3CH2Br same as that of CH2CHCH2Br? -
dieOriginally posted by d3sT1nY:Different leh.. Because for CH3CH2Br.. It's SN2.. Then CH2CHCH2Br is SN1 deducing from the rate equation.. Because the OH is not inside the rate equation..
i actually tot this paper was easy
now i dun tink so liao 
-
wats SN1 and SN 2?Originally posted by d3sT1nY:Different leh.. Because for CH3CH2Br.. It's SN2.. Then CH2CHCH2Br is SN1 deducing from the rate equation.. Because the OH is not inside the rate equation.. -
You dont take chem..?Originally posted by kenshin_himura:wats SN1 and SN 2?
SN1 = Substitution nucleophilic unimolecular..
SN2 = Substitution nucleophilic bimolecular..
Something like that lah..
Chemistry was a history.. Although still got paper 1.. -
wats tats how u guys term it ah... didn't noe SN1 or SN2 exist lol... all i noe rate eq state that naoh is not included so different mechanismOriginally posted by d3sT1nY:You dont take chem..?
SN1 = Substitution nucleophilic unimolecular..
SN2 = Substitution nucleophilic bimolecular..
Something like that lah..
Chemistry was a history.. Although still got paper 1.. -
Originally posted by kenshin_himura:wats tats how u guys term it ah... didn't noe SN1 or SN2 exist lol... all i noe rate eq state that naoh is not included so different mechanism Ya lor.. But nobody cares lah.. I mean the names.. My friends all also dont know..
-
lol then u have SE too and AE and AN lol wah so odd
-
Originally posted by d3sT1nY:You dont take chem..?
SN1 = Substitution nucleophilic unimolecular..
SN2 = Substitution nucleophilic bimolecular..
Something like that lah..
Chemistry was a history.. Although still got paper 1.. 
wads dat//...me die le 
-
econs knn ,so farking hard reali die le ,all apply to spore.. 5&6 ok but qn 1 ,i can fly kite draw diagram wrongly n so hard to ans e qn
-
sianz lah...i din noe about those until todayOriginally posted by Chelzea: wads dat//...me die le
In an SN1 reaction the nucleophilic substitution reaction proceeds with first order, i.e. the rate determining step of the reaction involves only one chemical species.
Bimolecular Nucleophilic Substitution (SN2)
The nucleophilic substitution proceeds with second order kinetics i.e. the rate determining step of the reaction involves the collision of two chemical species.
In a bimolecular nucleophilic substitution with allylic rearrangement the substitution occurs concurrently with an allylic rearrangement of double bonds in a conjugated system.
KNN!! -
Hard meh, the questions were ok lar ... but hor, i anyhow write, tmd... there goes another B... I did qn 3,4,5... not time to touch 3b at all ... wtf ...Originally posted by Chelzea:econs knn ,so farking hard reali die le ,all apply to spore.. 5&6 ok but qn 1 ,i can fly kite draw diagram wrongly n so hard to ans e qn
Qn 5, no diagrams.. sainzz... ended uo the essay is very short .... haizz ...
Qn, ask about education as externality, then 25 marks, alot of things to write meh??? Thats the 1qn i cross out liao ... -
Knn..? The question asking about the last diagram..?Originally posted by ctstalin:sianz lah...i din noe about those until today
In an SN1 reaction the nucleophilic substitution reaction proceeds with first order, i.e. the rate determining step of the reaction involves only one chemical species.
Bimolecular Nucleophilic Substitution (SN2)
The nucleophilic substitution proceeds with second order kinetics i.e. the rate determining step of the reaction involves the collision of two chemical species.
In a bimolecular nucleophilic substitution with allylic rearrangement the substitution occurs concurrently with an allylic rearrangement of double bonds in a conjugated system.
KNN!! -
got so complicated de meh? 2 marks for the reason Qs 1 for yes, no 1 mark for why... lolOriginally posted by ctstalin:sianz lah...i din noe about those until today
In an SN1 reaction the nucleophilic substitution reaction proceeds with first order, i.e. the rate determining step of the reaction involves only one chemical species.
Bimolecular Nucleophilic Substitution (SN2)
The nucleophilic substitution proceeds with second order kinetics i.e. the rate determining step of the reaction involves the collision of two chemical species.
In a bimolecular nucleophilic substitution with allylic rearrangement the substitution occurs concurrently with an allylic rearrangement of double bonds in a conjugated system.
KNN!! -
No need to draw lah.. But the first part of that question asking about SN2.. So must draw the mechanism out..Originally posted by kenshin_himura:got so complicated de meh? 2 marks for the reason Qs 1 for yes, no 1 mark for why... lol
And must show the Walden's inversion.. Whatever inversion lah.. -
wah got name one ah.. inversion of configuration mahOriginally posted by d3sT1nY:No need to draw lah.. But the first part of that question asking about SN2.. So must draw the mechanism out..
And must show the Walden's inversion.. Whatever inversion lah.. -
Some supposedly smart person found out about he inversion and name the inversion after him.. Make trouble for us..Originally posted by kenshin_himura:wah got name one ah.. inversion of configuration mah
-
wahhhhhh i was banking on my Physics to get A to pull my other subs up but after today's paper 3, i think it's tough
-
worry about results later, time to start enjoying lifeOriginally posted by wqtrigger:wahhhhhh i was banking on my Physics to get A to pull my other subs up but after today's paper 3, i think it's tough
chem mcq paper left -
words of wisdom, after results come out want to enjoy also no mood leOriginally posted by ctstalin:worry about results later, time to start enjoying life
chem mcq paper left -
Originally posted by hisoka:words of wisdom, after results come out want to enjoy also no mood le