Syllabus Objectives – Alkenes

Self Assessment Checklist

Alkenes I can do this!
(a) Describe the alkenes as an homologous series of unsaturated hydrocarbons with the general formula CnH2n.  
(b) Draw the structures of branched and unbranched alkenes, C2 to C4, and name the unbranched alkenes ethene to butane.  
(c) Describe the manufacture of alkenes and hydrogen by cracking hydrocarbons and recognise that cracking is essential to match the demand for fractions containing smaller molecules from the refinery process.  
(d) Describe the difference between saturated and unsaturated hydrocarbons from their molecular structures and by using aqueous bromine.  
(e) Describe the properties of alkenes (exemplified by ethene) in terms of combustion, polymerisation and the addition reactions with bromine, steam and hydrogen.  
(f) State the meaning of polyunsaturated when applied to food products.  
(g) Describe the manufacture of margarine by the addition of hydrogen to unsaturated vegetable oils to form a solid product.