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

Qualification => GCE AS & A2 Level => Queries => Topic started by: tmisterr on March 14, 2010, 01:07:05 pm

Title: DOES ANY1 ELSE AGREE THAT CIE AS CHEM MULTIPLE CHOISE IS A B****
Post by: tmisterr on March 14, 2010, 01:07:05 pm: DAMNIT, 1 HOUR IS NOT ENOUGH TO FINISH ALL THE 40 QUESTIONS, THEY REQUIRE QUITE A BIT OF WORKING OUT! CIE SHOULD MAKE IT 1HR 15 MINUTES AT LEAST!!!
Title: Re: DOES ANY1 ELSE AGREE THAT CIE AS CHEM MULTIPLE CHOISE IS A B****
Post by: Nobody on March 14, 2010, 01:32:40 pm: yep! they require so much of working!
We do a half-page working just for 1 mark!!!
WE need a little time more!
Title: Re: DOES ANY1 ELSE AGREE THAT CIE AS CHEM MULTIPLE CHOISE IS A B****
Post by: ~Mimi~ on March 21, 2010, 02:25:03 pm: totally agree :-\
Title: Re: DOES ANY1 ELSE AGREE THAT CIE AS CHEM MULTIPLE CHOISE IS A B****
Post by: nid404 on March 21, 2010, 02:26:29 pm: Altho chem is one of my fav subjects....I will agree with you...
Especially the last 10 q....they're damn too confusing at times...
Title: Re: DOES ANY1 ELSE AGREE THAT CIE AS CHEM MULTIPLE CHOISE IS A B****
Post by: Nobody on March 21, 2010, 04:21:38 pm: and sometimes..
the most obvious answer is the wrong one!
Title: Re: DOES ANY1 ELSE AGREE THAT CIE AS CHEM MULTIPLE CHOISE IS A B****
Post by: Saladin on March 21, 2010, 04:31:39 pm: i dont c y,

i think its just barely enuf time, if u understand chem well, u can do it, its not THAT difficult, although most of my frnds cant do it

i saw many ppl have probs wid this even at IG.

it just takes a lot of practice and know how of chem short formulas, they have to be at ur disposal at every twist and turn.
Title: Re: DOES ANY1 ELSE AGREE THAT CIE AS CHEM MULTIPLE CHOISE IS A B****
Post by: tmisterr on March 24, 2010, 03:01:10 pm: yeah dude your right, iv been practicing A LOT and now my timing is getting better at least i can finish a paper in the 1 hour given. I have a few question on chiral centres though:
1. can a carbon with a triple or double bond be counted as chiral?
2. do ethyl and methyl branches about as different groups eg if you have
CH₃CFCLC₂H₅
would that be chiral? it is bonded to a chlorine, fluorine, methyl and ethyl group. or do you only look at the immediate atom to which it is bonded to i.e C,F,CL,C and there is not chiral? these questions are really giving me trouble in paper 1!!
Title: Re: DOES ANY1 ELSE AGREE THAT CIE AS CHEM MULTIPLE CHOISE IS A B****
Post by: junky demon on March 24, 2010, 08:33:59 pm: A chiral centre is a carbon bonded to with all four different compounds or groups of atoms..
Here .. the carbon is connected to a flourine a chlorine a carbon from (ch3 ) and a carbon again from c2h5 so if im not mistaken ..
there isnt a chiral centre in this compound..
So naturally the triple bonds and double bond carbon cannot be termed as chiral centres ..
Title: Re: DOES ANY1 ELSE AGREE THAT CIE AS CHEM MULTIPLE CHOISE IS A B****
Post by: tmisterr on March 25, 2010, 02:40:15 pm: but look at the structure of glucose for example, the middle 4 carbons are all chiral but they at each attached to 2 carbons. so when you say "group" can you define it more clearly?
Title: Re: DOES ANY1 ELSE AGREE THAT CIE AS CHEM MULTIPLE CHOISE IS A B****
Post by: tmisterr on March 25, 2010, 04:02:19 pm: sorry, the glucose wasn't a good example cause it is definitely chiral but look at Carvone, u can search the structure online, its chiral but the chiral carbon is attached to two CH₂ groups, so why is it considered chiral?
Title: Re: DOES ANY1 ELSE AGREE THAT CIE AS CHEM MULTIPLE CHOISE IS A B****
Post by: A.T on March 25, 2010, 08:58:15 pm: There is always a fast way to do the question in P1. If u do half page of working you're really doing something wrong there.
Your concepts should be solidly clear, and i bet you wont just complete it in time but even would get time to check.
CIE gives exactly the amount of time you need,you shouldnt be completing really quick or really slow unless ur a genius or a noob.
So there is no need to get more time.