07/06/11 6B Edexcel Alternative to practicals

thanks for that ! I have the same revision guide :d quite helpfull heh ?

I have a really nice presentation on Separation of substances but it's not getting attached!

So download it from here: http://www.studentforums.biz/references-and-resources/want-some-revision-notes/15/

Thanks!

Welcome!

Do you have like a list of practicals that we need to know for the exam ? Also what is the difference between solvent extraction and salting out ? :s

I'm afraid I don't have the list of experiments. Sorry.
I'll post it here if I get hold of it. I'll get back on that later on.

I agree. Saturday is good.

be there with your doubts andy resourses you have to share.
I'll do the same.

Thanksssss so much man !! You have saved my life ! lol

Haha . I was just doing the Jan 2011 past paper and in question 1cii) you had to write the formula of deep grey green ppt and deep green ion.

My answer for the ppt was Cr(H2o)thrice(OH)thrice which is acceptable according to the marking scheme. For the formula of the ion, I wrote Cr(H20)twice(OH)4times and a overall minus. However, this is not in the marking scheme or in the examiner report. Its given as Cr(OH)six times with 3 minus overall.

I learnt it from the edexcel chemistry blue book. Pg -187 . Would my answer gain the mark ?

I am not sure. I'll confirm this with you later when I do the papers. But, to be on safe side. . . Go with the marking scheme!