Chemistry 21

[nerdybookworm]

it was easy for me yh i messed up a bit in the scheepid last q...or else the paper was easy...
-49 enthaply..OH YEA !

 

[Thampi4]

it was really easy

 

[walterlewin]

i got it +49 :'(

khair InshAllah just pray dnt take tension, ace the remaining papers ! hope for the best

 

[Duamask]

GUYS, what was for the question with the equlibrium it was Exothermic, yeah?

 

[Jaf]

it was so3 , it forms when no2 and so2 react when so3 is formed then h2so4 forms

I don't know... I mean looking at the question after that I changed my answer to H2SO4. SO3 does not have environmental consequences on its own without first turning into H2SO4. Donno, I could be wrong.

 

[Sanis]

/ \
| COOH
| COOH the cyclohexane will look like this in q4 last part
\ /

 

[Jaf]

/ \
| COOH
| COOH the cyclohexane will look like this in q4 last part
\ /

The ring structure opens up, actually (doesn't look like it in your structure though; sorry if that's what you meant). It'd be simply HO₂C(CH₂)₄CO₂H

 

[Awais.Basheer]

​

mayb yea coz almost all d ppl at my centre are definitely goin to lose 10 marks here n dere for sure.....was the enthalpy value cumin in -47 or someting?buh it sure was exothermic reaction....most of d ppl evn went wrong on d 2nd question based on moles...

It was -49

 

[Awais.Basheer]

lookin all over the internet just to know the reaction of HBr with ethene..cant freakin find the colour change in the internet ! from where do CIE get these stuff Oo

It was from orange to colourless

 

[iKhaled]

It was from orange to colourless

orange or brown? Oo

 

[Awais.Basheer]

orange or brown? Oo

Orange

 

[vivo990]

im rly sorry but hbr is exactly colorless just like hcl

 

[vivo990]

there is also a trick part about the equilibrium yield my friend told me abt the higher pressre what do u think it is?

 

[walterlewin]

I don't know... I mean looking at the question after that I changed my answer to H2SO4. SO3 does not have environmental consequences on its own without first turning into H2SO4. Donno, I could be wrong.

pprs goneeeeeeeee lets jst 4get abt it now

 

[walterlewin]

GUYS, what was for the question with the equlibrium it was Exothermic, yeah?

yes :3

 

[haochen]

SuP. IM back
and these are some of my answer for some questions
1) i wrote SO3
2) the enthalphy change is -49
3) the percentage of purity is 90.8
4) and the cyclic one when reacted with hot conc. KMnO4 ..its... HOOCCH2CH2CH2CH2COOH

and gud luck in today's bio practical

 

[user]

SuP. IM back
and these are some of my answer for some questions
1) i wrote SO3
2) the enthalphy change is -49
3) the colour of HBr is colourless and when reacted Br2 is produced so it changes to reddish brown
4) the percentage of purity is 90.8
5) and the cyclic one when reacted with hot conc. KMnO4 ..its... HOOCCH2CH2CH2CH2COOH

and gud luck in today's bio practical

for 3 it reacts with ethene....addition takes place...and bromo ethene is produced....where did u get thaat red brown gas?

 

[haochen]

for 3 it reacts with ethene....addition takes place...and bromo ethene is produced....where did u get thaat red brown gas?

Really ?????!!!!!!
then i think i read the question wrong.....
anywayz thx

 

[user]

and writing so i rememberr...instead of adding HBr...by mistake i added 2 Br

haha...that;s y better nt to ha ve any discussions

 

[vivo990]

My teacher told me if i use higher pressure there will be no effect to equilibrium yield of methanol as kp or kc is not changed, is that right?