Skip to main content
Like
Create new Glog
previous
next
Email share
165 views | 0 likes | 0 reposts
Alkanes
Under pressure and in the presence of a suitable catalyst, small alkenes will join together, by the opening up of their double bonds, to form long chains called polymers. The joining up of many individual alkene units by polymerization results in a variety of much-used and familiar plastics. These include polythene, polypropene, epoxy, polystyrene, and polychloroethene (PV).
Alkene molecules can be represented by displayed formulae, in which each atom is shown as its symbol (C or H) and the chemical bonds between them by a straight line.
The general formula means that the number of hydrogen atoms in an alkene is double the number of carbon atoms.
Structure of alkenes The products of cracking include alkenes (for example ethene and propene). The alkenes are a family of hydrocarbons that share the same general formula. This is CnH2n.
Some uses of Polymers : Polyethene plastic bags and bottles Polypropene crates and ropes Polychloroethene water pipes and insulation on electricity cables
