IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => GCE AS & A2 Level => Sciences => Topic started by: Reechna on November 06, 2009, 08:20:49 am

Title: Help for chemistry A2 core
Post by: Reechna on November 06, 2009, 08:20:49 am: Can some1 plz help??? How do you predict the order for a slow step mechanism in reaction kinetics? lik in nov08 p4 qus 2?? :-[
Title: Re: Help for chemistry A2 core
Post by: Lana Wolf on November 06, 2009, 12:55:08 pm: theres no quest like tht...cie or edexel????
Title: Re: Help for chemistry A2 core
Post by: 123 on November 06, 2009, 03:26:50 pm: go through this: http://www.knockhardy.org.uk/assets/08KIN.PDF (http://www.knockhardy.org.uk/assets/08KIN.PDF)
it helped me....thought not to sure with the ques.
Questions like that do come....this is CIE!

Lets do some predictions : wat mite come in Paper 42 this time!! which paper 4 u guys doin?? (all this is about CIE only)
I think Chem energetics; lattice enthalpy will def. come, could b in paper 41 /42 or both!!
Somethings quantitative in electrochem..(E values, faraday) / rate of reactions(orders) mite come... =|
Mayb less calculations with pH, Ka, etc...in acid-base equilibria
just guesses from other papers....any1 know for organic A2 sections??
Title: Re: Help for chemistry A2 core
Post by: Reechna on November 07, 2009, 05:40:38 am: Thanks... i finally figured it out. it was cie.
i believ there will be ionic equilibria, reaction kinetics, inorganic n tough questions of organics. the rest i do not know. i hope the application questions r not difficult. i really need to work well. i didn't do my best for p2 and p5 :'(
Title: Re: Help for chemistry A2 core
Post by: 123 on November 07, 2009, 06:54:25 pm: Quote from: Reechna on November 07, 2009, 05:40:38 am
Thanks... i finally figured it out. it was cie.
i believ there will be ionic equilibria, reaction kinetics, inorganic n tough questions of organics. the rest i do not know. i hope the application questions r not difficult. i really need to work well. i didn't do my best for p2 and p5 :'(
yeah same! My chem p5 went a lil bad :( But thats just 12% weightage....hopefully p33 practical chem(12% aswel) will balance it out; p2 went good...but not best
what do u think mite come in application ques.??
Title: Re: Help for chemistry A2 core
Post by: Reechna on November 08, 2009, 06:24:04 am: whatever comes out...im failing that section.never got the hang of it.
think will get NMR.. im not sure about DNA but maybe nanotechnology... partition coefficient. i dont think we'll get spider n silkworm silk (kevlar) got it on nov 08 n j09... unless cambridge likes that section ??? wat do u think?
Title: Re: Help for chemistry A2 core
Post by: Lana Wolf on November 08, 2009, 02:28:12 pm: i think we might DNA...partition coefficient i dnt think so...if they repeat..thn mayb yeah...
Title: Re: Help for chemistry A2 core
Post by: kavish on November 10, 2009, 05:03:41 am: well chem ain't difficult just a bit bulky...it's the only paper i got 13 snif but this time its gonna change XD XD XD
Title: Re: Help for chemistry A2 core
Post by: metalpredictedapocalypse on November 10, 2009, 07:30:27 am: Well there was partition coefficient in june 09 and also rate..Core part am thinkin group 4, polymers, electrode potential... anyone has a good guessing power for application part???
Title: Re: Help for chemistry A2 core
Post by: kavish on November 10, 2009, 01:14:30 pm: hey guys try this site it helps
http://www.gcsescience.com/science-chemistry-enter.htm
or
u can try
www.s-cool.co.uk
and as well there's

alevelchemistry.org
Title: Re: Help for chemistry A2 core
Post by: kavish on November 10, 2009, 01:17:19 pm: i mistype the link :P
its this one
http://www.alevelchemistry.co.uk/ :D
Title: Re: Help for chemistry A2 core
Post by: heemvi on November 10, 2009, 04:24:27 pm: mayb 4 electrochemistry we cn get on avogadro's constant...
n 4 rate of reaction am fnkin we cn get graphs n 2 show tht the reaction ws 1st order(we hv 2 show constnt half lives n all)
equations n obsrvations 4 transition metals
organic 4 sure we wil b hvng on aromatic cmpnds...n nitrogen cmpounds(its in the A2 syllabus)so knw all ur reactions vry well
n also iodo form test
n 4 application part...knw all ur notes well...esp on electrophoresis.

NOTE: its only sm guesses...
Title: Re: Help for chemistry A2 core
Post by: Reechna on November 11, 2009, 02:38:01 am: protein wil come out for sure... i dnt know why im having this feeling... gud luck everyone
Title: Re: Help for chemistry A2 core
Post by: blackline3020 on November 11, 2009, 02:55:54 am: hey..
Best of Luckk..
hope the ppr is easy!! :)
Title: Re: Help for chemistry A2 core
Post by: Reechna on November 11, 2009, 03:00:34 am: hope so 2. i got the paper in exactly an hour
Title: Re: Help for chemistry A2 core
Post by: blackline3020 on November 11, 2009, 03:11:57 am: i have it in 3hrs :)
n i didnt sleep all nite :(
Title: Re: Help for chemistry A2 core
Post by: blackline3020 on November 11, 2009, 04:42:34 am: how was the ppr guyzz??
Title: Re: Help for chemistry A2 core
Post by: heemvi on November 11, 2009, 06:36:43 am: uff i nva knew am so bad in prdicting questions 4 chmistry xms...(evn ma teachrs tld me these topics.LOL)
:P
wel the ppr ws ohk...organic part ws nt so gud....(y this year cie gave us such cmplex organic molecules???)

nyw hw u all find the ppr??
n cn U PLZ tel me according 2 u wts gna b the minimum marks 2 hv a 1 in chm ppr4??
:-\
Title: Re: Help for chemistry A2 core
Post by: Reechna on November 11, 2009, 06:38:28 am: Quote from: blackline3020 on November 11, 2009, 04:42:34 am
how was the ppr guyzz??

the paper was relatively easy. i didnt revise the right chapters though... so my own fault...

im sure u all going to do better than me... it went bad for me :D

i accept it with a smile because i know i'll redo next year :-[
Title: Re: Help for chemistry A2 core
Post by: kavish on November 11, 2009, 06:39:31 am: well the paper was easy wish i revised
well i think ( its a guess) 75 or more to get 1
me i can get around 50 marks lol
paper was easy revise well
Title: Re: Help for chemistry A2 core
Post by: Reechna on November 11, 2009, 06:40:02 am: just 2 bad we hav to wait 24 hrs 2 discuss the paper...

i dont know the minimum marks. depends on how u did in the other papers i guess :-\