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IB CHEM SL Y2 Arnon L. Ton P.

tanawat pratoomrat

on 23 February 2011

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Transcript of ALKENE!!!

IB Chem SL
Introduction Ton P. Arnon L. Alkene Introduction
- any series of unsaturated molecules
containing one or more carbon-carbon double bond
- general formula
- most simplest is ethylene -colorless gas, unique
-lighter than water
-insoluble in water Physical Properties Chemical Properties -More reactive than alkane -Highly combustible, burn to give water and carbondioxide -due to the presence of pi bond in the double bond which is easier to break Isomers Alkene are restricted from rotating because it involve the breaking of pi bond. Causing it to have only two type of isomer; cis and trans -Relatively Stable Reaction Hydrogenation Process of making alkane out of alkene requirement: metallic catalyst + temperature of 200C Liquid when linear alkene have 5 to 16 carbon and waxy solid when number of carbon is more than 16 carbon What is Hydrogenation? Use to make magarine out of vegetable oil Halogenation Hydration Reaction using steam(H2O) and ethene to produce ethanol Most natural ethanol are created from fermentation of starch and sugars Ethene is an important product form from cracking of oil Use to detect Alkene group Reddish brown liquid but will turn transparent after contacting Alkene group Cis Tran Isomer of which is not dipole Isomer which contain dipole Polymerization Process where monomer molecules are bond together to form a three dimensional networks or polymer chain either by free radical or ionic mechanism Ethene Molecules Part of Polyethene molecule 2000atm + 200C Broken into 3 steps called Initiation, Propagation and Termination Initiation As the name suggest, is the beginning of polymerization A Ra* or free radical is form by a molecules X absorbing enough energy so that it breaks into two Ra* Propagation Radical then react with alkene group creating longer chain of radical alkene Termination When two radical collide with each other, it is call termination. The result is either Ra2 or a long polymer chain. + = + = + = Uses Thermoplastic product (e.g.PVC)
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