Chemistry: Post your doubts here!

[drowning-in-studies]

39)1 and 2
View attachment 61409
40) This is easiest last question, i ever saw xD Sorry to say like this, but just u have to manipulate its structure and match with the given compound in question. All three is having that formula after oxidation. Try once, if u dont get ask me. Bored in making that one in 39 xD

39 Okay, got that
40 Yeah okay...but I don't get the 3rd molecule ? ANd hey Q 40 is in the examiner report's particularly difficult

 

[Thought blocker]

39 Okay, got that
40 Yeah okay...but I don't get the 3rd molecule ? ANd hey Q 40 is in the examiner report's particularly difficult

IDK how i found that easiest -_- This was the paper i gave and the only sure answer was this xD
This is your oxidised product of third molecule. CO2 is product as well, i have just shown that main thingy xD

 

[drowning-in-studies]

IDK how i found that easiest -_- This was the paper i gave and the only sure answer was this xD
This is your oxidised product of third molecule. CO2 is product as well, i have just shown that main thingy xD
View attachment 61410

mhmm.. okay then

 

[Thought blocker]

mhmm.. okay then

lol, whats this? got it or not?

 

[Cadence]

hey guys how's the paper today?

 

[drowning-in-studies]

lol, whats this? got it or not?

Yeah I did

 

[drowning-in-studies]

hey guys how's the paper today?

idk...I guess the threshold will be high?

 

[alevel_student]

I want classified past paper for HALOGENOALKANES any idea where can i get them ?????

 

[Destinyrulex]

Hey people!
I have done chemistry in A levels. Please let me know if there are any doubts, I would be glad to help

 

[Thought blocker]

I want classified past paper for HALOGENOALKANES any idea where can i get them ?????

you can click this : https://www.xtremepapers.com/commun...αтι¢ѕ-ѕ¢αηηє∂-ρυяє-мαтн-вσσкѕ-υρℓσα∂є∂.33891/

the 4th line in pink, click it and search the chemistry thingy u need. do like my thread if i helped.

 

[wolfestein99x]

Please explain asap

 

[wolfestein99x]

Please explain asap

Dont bother i got it

 

[3abder7man]

Salam
Can anyone please explain why the answer is C, not D?

 

[wolfestein99x]

Salam
Can anyone please explain why the answer is C, not D?
View attachment 61442

Relative size , LE is direcrly proptional to the charge/ionic radi , CaS will have ggreater ionic radi (0.1*0.18) hence LE will be lesser

 

[elmansy]

Hi i want to ask why the answer is that for this question
2No2 =N2O4
40% of the moles present at equilibrium is N2O4. If the total pressure of the system is 2 atm, the numerical value of the equilibrium constant, kp is .........the answer is 0.56 why? Thanks

 

[wolfestein99x]

elmansy kp= partial pressure of products^n / partial pressure of reactants^m
partial pressure = total pressure X no.moles of / total number of moles.
pressure = 2atm
partail pressure of N2O4 = 2 X (40/100) = 0.8
partail pressure of NO2 = 2 X (60/100) = 1.2

Kp = 0.8 / (1.2)^2 = 0.56 .

read the book this was a simple question

 

[Aishayasin]

PART A TO C can anyone explain in detail

 

[Thought blocker]

View attachment 61481View attachment 61481
View attachment 61482
PART A TO C can anyone explain in detail

2)
a) As I2 is formed, the solution will turn to purple.
b) Refer this link : https://www.xtremepapers.com/community/threads/chemistry-p4-a2-only.15983/page-10#post-276332
c) Rate = change in conc/change in time. Thus draw tangent at conc of 0.001 as that s initial conc. And make a triangle to calculate gradient and that is your initial rate.

 

[madridtas_CR7]

Can anyone explain this question and solve?

 

[Thought blocker]

Q = mc(t2 - t1)
Q = 45 * 4.18 * (34.7 - 23.4)
madridtas_CR7