maskman` Posted February 5, 2013 Share Posted February 5, 2013 umm i was wonder about this question . in my chemistry book it has shown br losing all its electrons and combining ethene. i was wondering whether this bond is co ordinate for not because it seems that ethene is donating electrons to the electron deficient bromine. any help is much appreciated Link to comment Share on other sites More sharing options...
jamesnichols Posted February 5, 2013 Share Posted February 5, 2013 i have some theory actually about electrons. and for this to fit in with that and vice versa. i would say... it couldnt exist without the electrons -1 Link to comment Share on other sites More sharing options...
hypervalent_iodine Posted February 5, 2013 Share Posted February 5, 2013 ! Moderator Note jamesnichols, Please stop hijacking threads with your pet theory. You have your thread, so please keep the discussion there. 1 Link to comment Share on other sites More sharing options...
Iota Posted February 6, 2013 Share Posted February 6, 2013 i have some theory actually about electrons. and for this to fit in with that and vice versa. i would say... it couldnt exist without the electrons What does that even mean? According to your theory on electrons "it" couldn't exist without electrons... that doesn't answer anything let alone what's being asked. Maskman, what you're seeing in your book is probably the heterolytic fission of a bromine molecule (Br2) as it approaches and becomes polarised by the electron dense ethene C=C bond. One of the bromine atoms takes the electrons from the bond that breaks in the bromine molecule, giving it a negative charge. The other atom from the bromine molecule (remembering bromine is diatomic so there are two bromine atoms per bromine molecule) becomes electron deficient and hence positively charged. Your textbook shows the negatively charged bromine atom as Br: (the colon representing two of its electrons)... and the other as just Br (without any electrons), this does not mean it has no electrons though, because it does. It's just not necessary to show them because none of the others take part in the reaction... In regards to the new bond being coordinate, remember that a coordinate bond is a bond where ONE of the two bonding chemical species provides BOTH of the two bonding electrons. https://www.google.co.uk/search?hl=en&sugexp=les%3B&gs_rn=2&gs_ri=hp&tok=v_e5UD02GbXMVJSo8NH-_g&cp=8&gs_id=v&xhr=t&q=ethene+%2B+bromine&safe=off&bav=on.2,or.r_gc.r_pw.r_cp.r_qf.&bvm=bv.41934586,d.d2k&biw=1230&bih=671&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&tab=wi&ei=qX8SUf-LEMPs0gWSgIGoBg#um=1&hl=en&safe=off&tbo=d&tbm=isch&sa=1&q=bromine+%2B+ethene+mechanism&oq=bromine+%2B+ethene+mechanism&gs_l=img.3...616201.625099.2.625527.30.26.2.2.2.0.82.1126.26.26.0...0.0...1c.1.2.img.Ne1d0xgCjm8&bav=on.2,or.r_gc.r_pw.r_cp.r_qf.&bvm=bv.41934586,d.d2k&fp=5301a610555fd68a&biw=1230&bih=671&imgrc=s3ir27dbw-ZtHM%3A%3B7fT_NgtAhhKekM%3Bhttp%253A%252F%252Fupload.wikimedia.org%252Fwikipedia%252Fcommons%252F5%252F5e%252FElectrophilic_reaction_of_bromine_with_ethene.png%3Bhttp%253A%252F%252Fwww.thestudentroom.co.uk%252Fshowthread.php%253Ft%253D1157377%3B1055%3B269 Look at this link and see if that is what's happening. Remember the curly arrows represent the movement of a PAIR of electrons. Link to comment Share on other sites More sharing options...
maskman` Posted February 7, 2013 Author Share Posted February 7, 2013 hahah thx a lot lota it helped a lot. i understand much more now thank you Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now