Chemistry: Post your doubts here!

[Metanoia]

mark scheme is more likely to hve errors than data booklet

I kind of agree. So long as you see that the application of concepts is correct, then theres no need to worry.

This was a question I was looking for, from W12_qp12


I think using bond energy of N2 as 994kJ/mol will give us the answer A, while using 944kJ/mol will not give us any of the above answer.
So students practicing past year papers might be a bit confused for this question.

 

[RoOkaYya G]

Aw, adulto.

wht happened kiddo?

 

[MYLORD]

me .-.

soooo... how was ur practical !!
i got some type of paralysis attack in the 1st 15 minutes.
it was like my mind has gone blank because i did the practical after about 2-3 months gaps !! Imagine.
i hope the threshold is low this time.

 

[RoOkaYya G]

soooo... how was ur practical !!
i got some type of paralysis attack in the 1st 15 minutes.
it was like my mind has gone blank because i did the practical after about 2-3 months gaps !! Imagine.
i hope the threshold is low this time.

lol u shldve practiced!
i was shocked too coz there was no titrations
well it was ok i guess. wbu?

 

[MYLORD]

lol u shldve practiced!
i was shocked too coz there was no titrations
well it was ok i guess. wbu?

alhumdulilah.....now i have to concentrate on the 2 papers.

 

[RoOkaYya G]

alhumdulilah.....now i have to concentrate on the 2 papers.

whch 2?
p1 and p2

 

[MYLORD]

whch 2?
p1 and p2

yes p1 and p2

 

[MYLORD]

whch 2?
p1 and p2

R u giving bio p-22 today?

 

[RoOkaYya G]

R u giving bio p-22 today?

yh i gave

 

[Metanoia]

33 The conversion of graphite into diamond is an endothermic reaction (∆H = +3 kJ mol–1).
C(graphite) → C(diamond)
Which statements are correct?
1 The enthalpy change of atomisation of diamond is smaller than that of graphite.
2 The bond energy of the C–C bonds in graphite is greater than that in diamond.
3 The enthalpy change of combustion of diamond is greater than that of graphite.

Ans : 1,2,3

Easiest to visualise statements 1 and 3 using the energy diagrams.


Statement 2 can be known to be true from background knowledge, or we can use the energy diagram on the left. Since it takes more energy to break the C(solid) of graphite into C(gas), we can infer that the C-C bonds of graphite is stronger.

 

[DeViL gURl B)]

Can I please get summary notes for chemistry ionic equilibrium ?
Please

 

[RoOkaYya G]

Can I please get summary notes for chemistry ionic equilibrium ?
Please

http://mehr.sharif.edu/~organic-ch/Chapter 19a.pdf

 

[Camille96]

Hello, what's the best way to revise for chemistry?

 

[loveyuan]

http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_s13_qp_42.pdf

i need help in 8ai >< thanks

 

[Nasrullah Ali Baloch]

Can anyone please provide me the best notes of AS-Level Chemistry...??

 

[♣♠ Magnanimous ♣♠]

Can anyone please provide me the best notes of AS-Level Chemistry...??

http://www.chemguide.co.uk/

 

[savera]

Yeah completed . I have A2 exam coming soon .

Thats pretty cool. Do you have notes for chem that you could share with me

 

[savera]

http://mehr.sharif.edu/~organic-ch/Chapter 19a.pdf

I have no idea who you are but these notessssssss. Awwwwwwwsssssssommmmmeeeeeee. Can you please tell me where did you get these ? If you have these then pls email it to me [email protected]
or maybe be can trade notes.... what ya say

 

[RoOkaYya G]

I have no idea who you are but these notessssssss. Awwwwwwwsssssssommmmmeeeeeee. Can you please tell me where did you get these ? If you have these then pls email it to me [email protected]
or maybe be can trade notes.... what ya say

i also hve no idea frim where i got em
ill search for more whn im free im glad tht it helped u
good luck for ur exams ^_^

 

[savera]

i also hve no idea frim where i got em
ill search for more whn im free im glad tht it helped u
good luck for ur exams ^_^

Guess what i found more.....but these seem to be answers of questions which i hav no idea from which book they are..... check it https://www.google.com.pk/#q=mehr.sharif.edu+Organic+chemistry