AQA Chemistry C1b

Cracking = Thermal Decomposition which takes place in a Catalytic Cracker(Kat Cracker) This breaks down larger alkane molecules into smaller alkane and at least 1 alkene>>>>>>e.g Heptane  

                                  H H H H H H H                      H H H H H                                                                    H-C-C-C-C-C-C-C-H  ---->>H-C-C-C-C-C-H  + H-C=C-H                                                 H H H H H H H                     H H H H H              H  H

Alkanes                                               Alkenes                                        Saturated (lots of hydrogen)           Unsaturated  (double bond) (=)     CnH2n+2                                       So contain less hydrogen             Do not react with bromine water     CnH2n