Chemistry: Post your doubts here!

[robinhoodmustafa]

hey guys
how are u all?
i need a help in(unsolved questions) and can u check the solved questions to me?

waiting your help
thanks in advance
View attachment 40989 View attachment 40990 View attachment 40991 View attachment 40992

you need it explained ?

 

[Someone2]

hey guys
need help on Oct'12 paper 51 qs 1... can someone pls post a diagram for qs 1(d)??

Thanx

 

[GCE As and a level]

you need it explained ?

The un solved questions yes plz , while the solved questions check if they are correct , if no then plz explain them

Wish u good luck

 

[thats_me]

it's a matter of the discharge priority stuff in electrlysis...
u know the reactivity series of metals that we did in O levels too?

so according to that, O2 is discharged in preference to SO4-2 and F- so it is discharged before F2 or SO2...
Br2 however is discharged in preference to O2.

similarly work with the reactivity series for metals... which will account for the discharge at the cathode.

Could you by any chance explain this in terms of the electrode potential?
As in what are the equations for hydrogen & oxygen & do we need to change the sign for the electrode potential if the equation is reversed I.e in oxidation form?

 

[Batguy]

 

[Batguy]

HELP MEEE

 

[Batguy]

View attachment 41008 View attachment 41009

kitkat <3 :P Suchal Riaz

 

[kitkat <3 :P]

View attachment 41008 View attachment 41009

Is the ans +347?

 

[Suchal Riaz]

kitkat <3 :P Suchal Riaz

View attachment 41008 View attachment 41009

 

[Batguy]

Is the ans +347?

i dun know the answer btw hess law lagaya?

 

[Suchal Riaz]

i dun know the answer btw hess law lagaya?

check my answer please.

 

[Batguy]

thank u Asma :*
...thanx a ton suchal

 

[Suchal Riaz]

yes it is correct. here is markscheme and the question number is 2.
http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_w08_ms_2.pdf

 

[Batguy]

w8 dekhta hoon subrun peeps

 

[Batguy]

yes dude its correct

 

[Suchal Riaz]

yes dude its correct

yar i am a little depressed. can you please give me any tips. apart from 2013 past papers and chemistry coursebook what else should i do in these three days.

 

[kitkat <3 :P]

I forgot to multiply by 2 hadd hai :"""( and Suchal Riaz hosly ki aapko zarurat hai hain -_-?

 

[Batguy]

yar i am a little depressed. can you please give me any tips. apart from 2013 past papers and chemistry coursebook what else should i do in these three days.

yar, revise notes, revise organic part most imp.!! do cram inorganic parts....en one more thing!!! wo practical wala page jo practical paper main given hota hai!! cations anions ka!!!! do give it a look

 

[Suchal Riaz]

yar, revise notes, revise organic part most imp.!! do cram inorganic parts....en one more thing!!! wo practical wala page jo practical paper main given hota hai!! cations anions ka!!!! do give it a look

thanks. i don't have notes to study other than those which i made myself.

 

[Batguy]

thanks. i don't have notes to study other than those which i made myself.

Tip my sir gave me!
open past paper
check if u can attept question.....
if u cant attept open the booklet!!
start revising that topic!!!
its best thing u can do!!! en it helps alot