chemistry

[Safia05]

where can i get simplified notes for chemistry - proteins , enzymes & DNA?

 

[aquariangurl]

That's the Biochemistry part of applications in Chemistry, Best is refer to the A level Bio text book, Mary Jones preferably.

 

[destined007]

Its in the data booklet:
http://xtremepapers.net/CIE/Internation ... let%29.pdf

 

[madan159]

Would any one provide me notes for Transition metals.

 

[madan159]

would someone describe the point:sodium and potassium in transmission of nerve impulses relating ion solvation and energetics.
This is the point of 11.1(m) of syllabus 9701

 

[madan159]

Mass of solid is 1.75g
mass of water is 25.0

calculate solubility of solid in grams per 100gram of water?

i used formula for solubility =( mass of solid/mass of water) * 100
Is it true? if not tell.

 

[hassam]

buddy just use the sixth grade RATIO PROPORTION SKILLS ......1.75g in 25g water so how many g in 100g water.....dont make things complicated for urself

 

[AAestar]

I have doubts in electrochemistry. How can you determine which Electrode reaction equation to use when there are a number of them. For example, a reaction between iodine and tin. There are two equations under tin, so which one I should choose?

 

[destined007]

See when the equation says iodine and tin metal then use the equation where Sn metal is present. If the question says Sn ion, use the equation where Sn ion is present.

 

[AAestar]

How to calculate [Pb 2+]? This is from nov 2011 P41. Thank you in advance!

See when the equation says iodine and tin metal then use the equation where Sn metal is present. If the question says Sn ion, use the equation where Sn ion is present.

There are cases where the keywords are not mention. What should I do then?

 

[destined007]

Ksp=[Pb+].([Cl-1])^2 can be seen from the equation
if x is the concentration of Pb, 2x will be the concentration of Cl. 1:2 ratio
2x10^-5= X . 4X^2
X=cube root((2x10^-5)/4)

 

[destined007]

Tell me the question where you can't figure out which equation to use.