Biology; Chemistry; Physics: Post your doubts here!

[Dukeofwin]

nopes, wen its not mentioned, we assume it to be conc.

Cant agree on that one! When its aqueous you have to consider it dilute! CIE cannot spoon feed students, they use a term that only students ranging from B-A* can understand! So yeah it Dilute!

 

[luckywang]

Please answer the question attached! We had to find the molecular mass of 'T'!
Just tell the method to solve it.
Thanks

no further information?

 

[luckywang]

if potassium, sodium, calcium, magnesium,aluminium in molten state? what is being discharged? coz no water present in molten state...

help pls?

 

[SALT]

Dukeofwin:
nopes, i'll stick to wat my tchr says...go see any such question in the past pprs and u'll see in the marking scheme tht its considered to be conc.
i hav done past pprs worth 20 years and never once did i get such a question wrong...
but if u want to stick to wat u think...go ahead, and if u confirm it frm a tchr, do tell me if im wrong...

 

[malay]

i agree with salt

Cant agree on that one! When its aqueous you have to consider it dilute! CIE cannot spoon feed students, they use a term that only students ranging from B-A* can understand! So yeah it Dilute!

i agree with SALT
cuz if we were suppose to consider it as dilute than why would answer to Q3/c/1 in ms is Cl2
http://www.xtremepapers.com/papers/...al O Level/Chemistry (5070)/5070_s05_qp_4.pdf
ms here
http://www.xtremepapers.com/papers/...al O Level/Chemistry (5070)/5070_s05_ms_4.pdf

 

[Minnie]

i need chemistry atp tips.
and anyone tell where to get old chem past papers like from 1993 onwards on net?

 

[Dukeofwin]

no further information?

Nothing more is required than the Molecular mass of "T" i.e 118

 

[malay]

help pls?

help pls?

they themselves will be discharged at cathode coz we r not available with any other cation

 

[Dukeofwin]

i agree with salt

i agree with SALT
cuz if we were suppose to consider it as dilute than why would answer to Q3/c/1 in ms is Cl2
http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Chemistry (5070)/5070_s05_qp_4.pdf
ms here
http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Chemistry (5070)/5070_s05_ms_4.pdf

You pick out a question that has already confused many.
For me its dilute!
But ain't saying you are wrong!
Would confirm it soon.....

 

[Minnie]

I'm confused about this question too. They should have mentioned that it was concentrated.. :/

yeah im confused aswell.

 

[Rimsa]

umm i just called my teacher. she says its supposed to be dilute

 

[luckywang]

they themselves will be discharged at cathode coz we r not available with any other cation

so cation like mg,ca,al and na will be discharged when it is in molten state where no water present coz no other cation present?

 

[luckywang]

Nothing more is required than the Molecular mass of "T" i.e 118

ur doc didnt mention Mr is 118...

 

[Dukeofwin]

umm i just called my teacher. she says its supposed to be dilute

Right back at SALT and MALAY!
I had a pretty good idea about it being dilute

 

[daredevil]

Why are the products of the electrolysis of AQUEOUS (NOT conc.) sodium chloride, Chlorine and Hyrdogen?? Why not Oxygen and Hydrogen?? >.<

I'm having the same prob!! >__<

 

[Dukeofwin]

ur doc didnt mention Mr is 118...

Well i just asked to tell the method so your answer could include that (using the Mr you can............)
thats why i didn't mention it

 

[Dukeofwin]

i agree with salt

i agree with SALT
cuz if we were suppose to consider it as dilute than why would answer to Q3/c/1 in ms is Cl2
http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Chemistry (5070)/5070_s05_qp_4.pdf
ms here
http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Chemistry (5070)/5070_s05_ms_4.pdf

Study page 120 and 121 of Chemistry(federal) by Christopher N. Prescott.
Topic 9.6 and table 4

 

[luckywang]

Well i just asked to tell the method so your answer could include that (using the Mr you can............)
thats why i didn't mention it

use Mr minus those given oxygen, hydrogen and carbon... then n+n+2=(remain mass) then continue to solve? correct m if im wrong...

 

[malay]

Right back at SALT and MALAY!
I had a pretty good idea about it being dilute

it all about wat the ms and examiner report says not ur teacher...dey r not the examiners after all!
or waisay
¯\_(-_-)_/¯ nai manna to na mano

 

[Rimsa]

I'm having the same prob!! >__<

me too...

I'm having the same prob!! >__<