Chemistey Doubts

[JmCullen]

I'll have lots of questions.. so i'll make a topic here..
Thanks in advance!!!!!
really appreciate it!

ok..

What does it mean of "active component of air"????
It's oxygen though. but what does it means?

 

[XxMarkxX]

yesss its oxygen !! it means when anything is heated or reacted with air !! oxyen is the substance who reacts !

 

[brainiac]

simply it means the most reactive gas in air ..... and the one which usually takes part in reactions like combustion etc . !!!!!!!!

 

[JmCullen]

oh! ok.. Thanks alot!
wish everyone get good grades on chem too!

 

[JmCullen]

Another question..

http://www.xtremepapers.me/CIE/Cambridg ... 6_qp_3.pdf
(question paper)

http://www.xtremepapers.me/CIE/Cambridg ... 6_ms_3.pdf
(answer paper)


7.a.i
What does it mean by "Twice final volume"???
means, if there if 6 boxes at the actual final volume, then the new graph will 12 boxes?

 

[brainiac]

yup!! the graph would be double of the first one as the amount of magnesium ribbon is also doubled ...........and so it will alter the reaction by making twice the volume of the first .........

 

[JmCullen]

ok!!! Thanks a lot!!!!!!!!!

 

[gary221]

yesss its oxygen !! it means when anything is heated or reacted with air !! oxyen is the substance who reacts !

hey i didnt know tht!!!!
thnx pal :beer: :beer: :beer: :beer: :beer: :beer:

 

[JmCullen]

next.. sorry.. im not good in chemistry..

what is the structure of protein?
is it NH2-CRH-C=O-OH ????

 

[gary221]

next.. sorry.. im not good in chemistry..

what is the structure of protein?
is it NH2-CRH-C=O-OH ????

no offence but is tht really required???????? :%) :%) :%) :%) :%)

 

[JmCullen]

next.. sorry.. im not good in chemistry..

what is the structure of protein?
is it NH2-CRH-C=O-OH ????

no offence but is tht really required???????? :%) :%) :%) :%) :%)

haha.it's ok..
yes. they asked in the paper 3 chemistry

http://www.xtremepapers.me/CIE/Cambridg ... 6_qp_3.pdf

8.b.i

 

[brainiac]

well i didnt understood wat u wrote but the protein structure is like this with a peptide bond in between

 

[JmCullen]

haha..
i wrote the first formula..
ok!
so i just need to draw the structure in peptide group, the yellow box one?

 

[gary221]

well i didnt understood wat u wrote but the protein structure is like this with a peptide bond in between

ok so is d protein structure d first 1 or the 1 below????

 

[JmCullen]

another question..

http://www.xtremepapers.me/CIE/Cambridg ... 7_qp_3.pdf

7.c.i
the answer is 8
but how to calculate that?

 

[gary221]

another question..

http://www.xtremepapers.me/CIE/Cambridg ... 7_qp_3.pdf

7.c.i
the answer is 8
but how to calculate that?

u hve to do it by the ratio/ proportion method
ie if 35g of unsaturated fats require 5 drops if Br water,
how many drops will be neede 4 56g?
56*5/35 = 8

 

[JmCullen]

another question..

http://www.xtremepapers.me/CIE/Cambridg ... 7_qp_3.pdf

7.c.i
the answer is 8
but how to calculate that?

u hve to do it by the ratio/ proportion method
ie if 35g of unsaturated fats require 5 drops if Br water,
how many drops will be neede 4 56g?
56*5/35 = 8

ok! get it! thanks a lot!

 

[gary221]

well i didnt understood wat u wrote but the protein structure is like this with a peptide bond in between

ok so is d protein structure d first 1 or the 1 below????

could sum1 pls help?????

no problem!!!

 

[JmCullen]

well i didnt understood wat u wrote but the protein structure is like this with a peptide bond in between

ok so is d protein structure d first 1 or the 1 below????

could sum1 pls help?????

no problem!!!

actually i wanna know too!
i'm waiting for someone to reply. im still blank in that question. haha

 

[gary221]

we r on d same page!!!! :lol: :lol: :lol: