Chemistry 21

[Jaf]

really dn tell all ur answers an ill mail it to the examiner as their mark scheme for reference.....by d way congrats i suppose dn ur gonna top in chemistry coz all d brightest students got it wrong... imanmalik

Am I the only one who found that question easy? Everyone at my center was whining about that question too. :S

Oh well. I'm expecting the GT to be VERY high - 52 at least.

 

[Most_UniQue]

Wt ws the last question fr u guys? I gave p22 and everything ws easy

 

[walterlewin]

enthalpy kya thi? -49? and i guess structure in last question was 2 alcohols and 1 aldehyde ?
wat abt the 2 elements that form more than 1 oxides ?

 

[Ashique]

^phosphorus and sulfur.

 

[Sanis]

really 1 of the easiest exams !! i expect that P11 would have a curve of 30 or 29, i guess since P21 and p31 were 2 easy

 

[Jaf]

What would be formed from SO2 in the atmosphere?

I wrote H2SO4. :/

 

[anushey]

i wrote SO3...is it rite?

 

[dayeed]

i suppose d percentage purity is in 90s value coz mny ppl got it 90%...

MJHE PERCENTAGE PURITY WALA KIUN NAHI YAAD KAUN SA QUESTION THA?

 

[dayeed]

SORRY WRONG VARIANT =P

 

[dayeed]

Where did u guys give 21 from ?

 

[aka mohammed]

What was the colour of the reaction with HBr before and after the reaction was it brown to colourless or something else?

 

[iKhaled]

What was the colour of the reaction with HBr before and after the reaction was it brown to colourless or something else?

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

 

[meeeeoowww]

according to the book yellow/orange bromine water turns colourless

 

[meeeeoowww]

and SO2 in the atmosphere forms SO3 ...... nybdy knows d value for enthalpy? evry1s gettin -49 ......

 

[anushey]

HBr is colurless dude so there was no colur change...

 

[walterlewin]

i wrote SO3...is it rite?

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

 

[walterlewin]

and SO2 in the atmosphere forms SO3 ...... nybdy knows d value for enthalpy? evry1s gettin -49 ......

-49 it is !

 

[Majed Kaaki]

EASY !! buttt the last question is messed up cuz everything is related to each other i was confused i think all is wrong
and becuz of my stupidity !!! in q 1 i put Al2O3 is basicc !!!! its amphotericc !!

 

[Majed Kaaki]

-49 it is !

i got it +49 :'(

 

[wajji345]

Did 30 marks only