Mr Rayon Posted May 25, 2008 Share Posted May 25, 2008 What are they? Is it really that important in Chemistry? How many are there? Did you memorise them? How long did it take? Link to comment Share on other sites More sharing options...
Cap'n Refsmmat Posted May 25, 2008 Share Posted May 25, 2008 It's useful because they pop up fairly often. It didn't take me too long (but I don't profess to know that many), and you should probably just print out a sheet of the common ones and try to learn them. The more chemistry you end up doing, the more ions you'll be using and thus the more you'll end up remembering. (You remember the common ones easily because you end up needing to know them a lot.) Link to comment Share on other sites More sharing options...
insane_alien Posted May 25, 2008 Share Posted May 25, 2008 poly atomic ions are simply molecules that have a charge. examples are: OH- H3O+ NO3- NH4+ and so on. it is best if you memorise them as poly atomic ions pop up everywhere. Link to comment Share on other sites More sharing options...
CaptainPanic Posted May 26, 2008 Share Posted May 26, 2008 I would suggest learning the names of about 10-15 of them. You'll enjoy it the rest of your life. [ce]SO4^2- , PO4^3- , CO3^2- , HCO3^-[/ce] These and the ones posted by insane_alien are all very common. You might find them in any article by your local newspaper, and in any science related article. Useful to know them no matter what the future will bring for you. Wikipedia (as always) has a page on this topic. I know about 30%-50% of all names in the list they provide on the page... they're not all equally common. p.s. this topic doesn't belong in the organic chem. forum. Inorganic or general chemistry is better imho. Link to comment Share on other sites More sharing options...
YT2095 Posted May 26, 2008 Share Posted May 26, 2008 and for the halogens you only have to remember the ions for one of then (say Chlorine for instance) and the all the Other halogens ar easily transposed into the name. Cl = chloride OCl =hypo chlorite ClO3 = chlorate ClO4 =perchlorate everything in Bold could just as easily be "Brom" "Iod" "Fluor" Link to comment Share on other sites More sharing options...
John Cuthber Posted May 26, 2008 Share Posted May 26, 2008 Do perfluorates exist? Link to comment Share on other sites More sharing options...
Tartaglia Posted May 26, 2008 Share Posted May 26, 2008 Perfluorates are unlikely to exist as F has no available d orbitals required for pi bonding Link to comment Share on other sites More sharing options...
YT2095 Posted May 27, 2008 Share Posted May 27, 2008 http://scidiv.bcc.ctc.edu/bg/poly.html http://66.102.9.104/search?q=cache:Qvv3kAAUnyoJ:math-wizard.com/chemdata2.pdf+Perfluoric+Acid&hl=en&ct=clnk&cd=20&gl=uk&client=firefox-a Link to comment Share on other sites More sharing options...
John Cuthber Posted May 28, 2008 Share Posted May 28, 2008 I can constuct a hypothetical perfluorate ion by analogy with perchlorate. I can put it on a list on a web page. Is there any evidence of it really existing in macroscopic quantities? Link to comment Share on other sites More sharing options...
brainslice Posted May 29, 2008 Share Posted May 29, 2008 If you wish to continue your education in the sciences I seriously suggest you pile these little beasts into your head...maybe 20 at the least. They are simple to memorize and will serve you well the rest of your career. Link to comment Share on other sites More sharing options...
Gilded Posted June 5, 2008 Share Posted June 5, 2008 It's very useful (and sort of fun) to remember the most common ones, as pointed out multiple times already. Not only by name but by structure too, helps if you need to predict properties of the compounds that they are a part of. Link to comment Share on other sites More sharing options...
thedarkshade Posted June 8, 2008 Share Posted June 8, 2008 What are they? Is it really that important in Chemistry? How many are there? Did you memorise them? How long did it take? Knowing some oxidation numbers would help. If you know what oxidation number can a certain element have, then finding the oxidation number of any polyatomic ion would be just way easy! Link to comment Share on other sites More sharing options...
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