A student sets up the apparatus shown below to carry out the catalytic cracking of dodecane to produce ethene gas.

Explain how ethene is produced from the dodecane using this apparatus.
Practise Edexcel GCSE Chemistry Fuels with exam-style questions for Foundation and Higher tier. 100 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.