This re-re-re-reposted thread is locked, and I hope the O.P. will not re-post the same question again, but instead a more complete question.
AKRON: you have some reading to do: starting with the forum rules:
http://www.chemicalforums.com/index.php?topic=65859.0 We don't allow reposts across sub-forums, nor reposts of the same exact question, even if months apart. We like complete answerable questions, not "tell me everything."
You can also read this thread that I merged all together for you. You got an answer and a link from
kriggy:, and a link from
Borek: Do you understand the content of those links completely? What's still missing, that you think you need to know? In what way do their posts not answer your questions?
I'm asking you to follow the rules, but I'm also a little insulted that you thought you could just ask the same general question, one month later. I'm left with the suspicion you've been assigned a term paper-type question, and instead of reading, and writing it, you want us to write it for you. These questions, of yours, are at least a little disappointing, even if my suspicion is not absolutely the case.