Debrief - 9746 Chemistry
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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?
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paper 2 is usually harder than paper 3..it can be seen from past yr papers n our specimen paper this yr too..Originally posted by tangjing: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? -
Wha lau ... study Proteins for one whole day in the end decided not to pick the question
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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? -
hey!
y dun u all write bout which jc u are from
n wad comments ur frenz have bout the papers!!
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what does NaCN and HCN act as?
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one is source of nucleophile one is catalyst..shld be..bt i forget which is which le..hahaOriginally posted by th3m0ment:what does NaCN and HCN act as? -
NaCN is catalyst, HCN is source of nucleophile.
This one I got wrong. Wrote HCN as catalyst wrongly. T_T -
the rate equation is rate = [ketone][NaCN] right?
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yes. bcoz order of reaction for HCN is 0Originally posted by th3m0ment:the rate equation is rate = [ketone][NaCN] right? -
I think so.Originally posted by th3m0ment:the rate equation is rate = [ketone][NaCN] right?
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.
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9746/02 H2 Chemistry Paper 2
Discuss ...
Q1 Mole Concept, Gaseous State, Homologus Series
Q2 Group VII
Q3 Transition Metals (6 marks only ?
)
Q4 Playing with Carboxylic Acid Derivatives
Q5 Playing with Benzene (17 marks )
Seems like Electrolysis not tested yet ... ho hum ... -
Originally posted by Yaimster:
i was expecting electrolysis that i mugged the whole night for it. this morning then chiong inorg and org chem
[b]9746/02 H2 Chemistry Paper 2
Discuss ...
Q1 Mole Concept, Gaseous State, Homologus Series
Q2 Group VII
Q3 Transition Metals (6 marks only ? )
Q4 Playing with Carboxylic Acid Derivatives
Q5 Playing with Benzene (17 marks )
Seems like Electrolysis not tested yet ... ho hum ...[/b]
and OMFG. hell lots of org and inorg chem
WHAT IS CAMBRIDGE DOING? -
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
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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"
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Originally posted by plasticpiranha:
Agree that its much much simpler than p3.
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 [b]one compound that will react for each reagent? hmmm [/b]
I think put electrophilic substitution safer... acid hydrolysis for dilute HNO3 not very common in cambridge questions I guess -
it means one reagent can only react with one compoundOriginally posted by striderz_o405: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"
but one compound can react with more than one reagents
i also spent quite a while trying to get that
, cause it seemed unlikely that they have a mistake in the paper
oh crap, i put acidic hydrolysis!
thats the first thing that came to my mind... -
Paper 2 is so much easier than Paper 3 la!!!
i LOL-ed at Qn 1..
overall, pretty easy paper... testing all the basics nia~~
so sad Electrochemistry, not much came out. So most likely come out at Paper 1.
HENG dun have SHE!! or else i jia lat.. -
hmm, usually p1 tests on everything anywaysOriginally posted by akinos:Paper 2 is so much easier than Paper 3 la!!!
i LOL-ed at Qn 1..
overall, pretty easy paper... testing all the basics nia~~
so sad Electrochemistry, not much came out. So most likely come out at Paper 1.
HENG dun have SHE!! or else i jia lat.. 
bah off to mug for my h1 econs and pray that itll be as easy as todays chem -
screwed la..Originally posted by akinos:Paper 2 is so much easier than Paper 3 la!!!
i LOL-ed at Qn 1..
overall, pretty easy paper... testing all the basics nia~~
so sad Electrochemistry, not much came out. So most likely come out at Paper 1.
HENG dun have SHE!! or else i jia lat..
i guess im the only 1 in spore who get qn 1 wrong..
i look at it then wrote alkenes..
so retarded.. and careless.. -
for qn 1, state the homologous series one. izzit alkane or the alkane formula?
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state the word alkaneOriginally posted by maxtonian:for qn 1, state the homologous series one. izzit alkane or the alkane formula? -
Originally posted by plasticpiranha:
HNO3 can't be used for acid hydrolysis, my tutor specified. Only H2SO4 and HCl are strong enough ... I guess.
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 [b]one compound that will react for each reagent? hmmm [/b] -
someone post all the short answers?
so qn 1 should deflate or no need deflate? the external pressure is the airplane or the atmosphere?
if everything so easy, then pplz need >90 to get A liao mehz?
must be cambridge put some tricks, then pplz fall for it without realizing!
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I said no need deflate cause the difference in pressure at 10000m did not exceed the maximum difference which is 6.99 bar. But I not sure. This part I cancel cancel a lot of times then very messy =/Originally posted by th3m0ment:someone post all the short answers?
so qn 1 should deflate or no need deflate? the external pressure is the airplane or the atmosphere?
if everything so easy, then pplz need >90 to get A liao mehz?
must be cambridge put some tricks, then pplz fall for it without realizing!