... the diagram above. ==> Light the Bunsen burner, adjust it to a blue flame and heat the aluminium oxide. (Make sure the test tube is filled with water when you start to collect the gas produced.) ==> As the aluminium oxide gets hot the heat reaches the ethanol at the end of the tube. The ethanol then changes to vapour, passes over the hot aluminium oxide and is dehydrated to produce ethene gas. ==> Let the bubbles produced escape for a short time (these are mainly bubbles of displaced air). Collect 5 test tubes of the gas and put a stopper on each tube when it is filled. ==> When the test tubes have all been filled, loosen the retort stand and raise the apparatus so that the delivery tube no longer dips into the water. This avoids suck back of water as the tube begins to cool which could cause the boiling tube ...

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