Debrief - 9746 Chemistry

last SG · 2007-11-05T19:38:26+00:00

I interpreted alkaline to be alkaline. That's it. So given the 2 choices, I chose the salt which is a weaker conjugate base.

akinos SG

now i need to count on Paper 2 and MCQ to secure a B... Crying or Very sad

angelfairy SG

ethanoic acid does not have a carbonyl group, but a carboxylic acid group

xxxshadowxxx SG

ya..bt i tink the explaination abt the secondary radicals being more stable is more suitable n technical..cos i was following wat was given in notes..all in all the problem lies wif the question..did not state clearly

teraexa SG

which other jc will the chem dept force-feed and drill chem stuffs into your until you resemble nothing more than battery farm animals stuffed with chemical additives ready to be sent to the slaughterhouse known as A levels chemistry?

of course it's rjc.

xxxshadowxxx SG

haha..nice description

tangjing SG

I'm making no sense out of all these explanations you people made....Now I know where all the smart genes went =/

Will Paper 2 and 1 be of a lower standard? Crying or Very sad

xxxshadowxxx SG

paper 2 is usually harder than paper 3..it can be seen from past yr papers n our specimen paper this yr too..

Yaimster SG

Wha lau ... study Proteins for one whole day in the end decided not to pick the question Mr. Green .

Lost 7 marks for blanks in the time-attack. But nevertheless I think it's easier than my prelims.

Oh and is the methanal-ethanal-propanone ratio 1:2:1?

duperlicious SG

hey!
y dun u all write bout which jc u are from
n wad comments ur frenz have bout the papers!! Very Happy

th3m0ment SG

what does NaCN and HCN act as?

xxxshadowxxx SG

one is source of nucleophile one is catalyst..shld be..bt i forget which is which le..haha

teraexa SG

NaCN is catalyst, HCN is source of nucleophile.

This one I got wrong. Wrote HCN as catalyst wrongly. T_T

th3m0ment SG

the rate equation is rate = ketone right?

akinos SG

yes. bcoz order of reaction for HCN is 0

Yaimster SG

I think so.

And the mechanism is Nucleophilic Addition. Stoopid me go name by mechanism Nucleophilic Substitution =(.

(FYI ... they asked you to describe the mechanism, not predict the mechanism. Twisted Evil )

lpx88 SG

Shocked Shocked Shocked

Yaimster SG

9746/02 H2 Chemistry Paper 2

Discuss ...

Q1 Mole Concept, Gaseous State, Homologus Series
Q2 Group VII
Q3 Transition Metals (6 marks only ? Mad )
Q4 Playing with Carboxylic Acid Derivatives
Q5 Playing with Benzene (17 marks Shocked )

Seems like Electrolysis not tested yet ... ho hum ...

striderz_o405 SG

Originally posted by Yaimster:
[b]9746/02 H2 Chemistry Paper 2

Discuss ...

Q1 Mole Concept, Gaseous State, Homologus Series
Q2 Group VII
Q3 Transition Metals (6 marks only ? Mad )
Q4 Playing with Carboxylic Acid Derivatives
Q5 Playing with Benzene (17 marks Shocked )

Seems like Electrolysis not tested yet ... ho hum ...[/b]

i was expecting electrolysis that i mugged the whole night for it. this morning then chiong inorg and org chem

and OMFG. hell lots of org and inorg chem

WHAT IS CAMBRIDGE DOING?

plasticpiranha SG

yah i think this paper is much much simpler than p3

neways me n my friends were arguing about dilute HNO3 for the last question
it can be acidic hydrolysis and it also can be electrophilic substitution (phenol -> nitrobenzene)?
but they clearly mentioned that there is only one compound that will react for each reagent? hmmm Confused

striderz_o405 SG

hmm cambridge is contradicting

one statement says
"only one compound that will react for each reagent"

then the next sentence says
"you can use once, more than once, or none at all in your answers"

Surprised

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