solve these chemistry question!!!

[darknight_007]

OCTOBER/NOVEMBER 2006!!
B7) B8) B9) B10)

 

[PlanetMaster]

Which paper?
And what B7, B8, B9 & B10?

 

[darknight_007]

chemistry 5070....
october/novembr 2006"S
question no. B7,B8,B9,B10!!!
hope u got it now!!

 

[PlanetMaster]

No i didn't :!:
Its in 'Cambridge O Level' forum and is titled 'Chemistry' so i know its '5070 - Chemistry'.
Like my second post, 'Which Paper?'
Paper 1, Paper 2 or what?
Why don't you paste a link here?
And which question?
like Q.2b(ii) etc
B9, B10 etc doesn't makes sense :!:

 

[darknight_007]

http://www.xtremepapers.net/CIE/Cambridge O Levels/5070 - Chemistry/5070_w06_qp_2.pdf

there u go its the link!!!!
and plz answers the question of section B of this paper....
question no. B7, B8, B9, B10!!! ( SECTION B)

 

[PlanetMaster]

I thought its like Q.1b etc. Sorry!

B7(a):
Oxidation state of Nitrogen changes from 0 to 3.

B7(b):
2NO3ˉ + 12H

+ 10eˉ → N2 + 6H2O

B7(c)(i):
Nitrogen can be taken from air and Hydrogen can be taken from Water.

B7(c)(ii):
400ºC temperature and iron catalyst.

B7(d):
NH4NO3 : 100 x (28/80) = 35%
(NH4)2HPO4 : 100 x (28/132) = 21.2%
So NH4NO3 clearly contains greater percentage of nitrogen by mass.

B7(e):
It is a threat to marine life.

 

[darknight_007]

where r the answers 2 other 3 question!! admin!! :?