topic 13 organic 2

• cracking is necessary as it helps match supply to demand and alkenes are useful for the petrochemical industry
• cracking of long chain alkanes produces alkenes+shorter alkane, by catalytic cracking, using silica or alumina, temperature 600-700
• bromine water test, bromine water is orange/yellow, shake it, if its an alkene it turns colourless, alkane remains orange/yellow
• alkanes and halogens undergo a substitution reaction under the presence of uv light
• alkenes functional group is c=c
• the general formula for the alkenes is cnh2n
• problems in the disposal of addition polymers, inertness and inability to biodegrade, production of toxic gases when they are burnt
• addition polymer is when many monomers join together to form polymers
• alkenes are unsaturated as they contain a double carbon to carbon bond
• Drawing polymers

  
• bromine+alkene, ethene+bromine- dibromoethane