CHEMISTRY PAPER 1

[InnocentAngel]

ok this question took me some time to get it but now i got it ! so lemme explain it for u..

ok so you see this is the hess's cycle that i drew from there we can see that the,
ΔH of formation of CO2 = -283
ΔH of formation of H2O = -268
and we also need the enthalpy change when we change the H2O(l) to H20(g) so its +44

now from the diagram i drew we can calculate ΔH which is:

ΔH = ( -286 + 44 ) - ( -283)
ΔH = 41Kj/mol which is C !!

i hope this helped u..

Awww thanks so its positive 44 okay okay now iget it . Thanks dude .

 

[yashmehta96]

please try this one
nov 2006 paper 1
q 4

 

[dadufahad]

Please help me with this question friends : I just cant figure out ... View attachment 18622

(1)ch3ch2cl
(2)ch3chcl2
(3)ch3ccl3
(4)ch2clccl3
(5)chcl2ccl3
(6)ccl3ccl3
(7)chcl2chcl2

thus there are 7 possibilities

 

[InnocentAngel]

(1)ch3ch2cl
(2)ch3chcl2
(3)ch3ccl3
(4)ch2clccl3
(5)chcl2ccl3
(6)ccl3ccl3
(7)chcl2chcl2

thus there are 7 possibilities

But it says where n can be any integer from 1 to 4 .So i guess we shouldnt be taking (6)ccl3ccl3 (5)chcl2ccl3 right ?

 

[InnocentAngel]

please try this one
nov 2006 paper 1
q 4

Use this formula :
CxHy + (x + y/4 ) O2 ----> xCO2 + (y/2) H20

 

[InnocentAngel]

Pleease pleeaase help me : this question is repeating itself much and i still cant get it : Ans is B . WHY WHY WHY ? How to eliminate C ?

 

[Iadmireblue]

Pleease pleeaase help me : this question is repeating itself much and i still cant get it : Ans is B . WHY WHY WHY ? How to eliminate C ?View attachment 18643

Draw a vector diagram,the one with the least vectors gives the largest dipole
Good luck

 

[adityar]

How are the answers of W10P12 Q 29 and 30, both D?

 

[sajal]

could any one please give me the compilation of chemistry link

 

[Ashayn]

so how was it?? Personally I'd say it was 50/50

 

[Pals_1010]

It was okay

 

[Daniyal23]

I thought it was easy....Especially the last ten questions...

 

[akshay.RONALDO]

many past exam questions. just a few were a bit annoying ><

 

[akshay.RONALDO]

I thought it was easy....Especially the last ten questions...

Yes, the last 10 were really nice

 

[Ashayn]

guess the GT will be very high then

 

[iKhaled]

guess the GT will be very high then

i remember the one we did in may/june 2012 paper 11 was sooooooo tough that the GT was so slow that u would get a B if u scored 20/40 i guess