In which order should the following be in the cracking process: The vapour is passed over a catalyst at a high temperature; The long-chain molecules are heated; The molecules are cracked on the surface of the catalyst; They are vaporised?
1. The long-chain molecules are heated. 2. They are vaporised. 3. The vapour is passed over a catalyst at a high temperature. 4. The molecules are cracked on the surface of the catalyst.
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