Alcohol as a fuel (Brazil runs its vehicles on alcohol, why not the UK?). You can also "burn" a pound;5 note soaked in alcoholwater with flames, but it is not consumed. At KS4 and KS5 the simple properties of alcohol including oxidation with acidified dichromate allow a simple breathalyser to be designed. KS5 students could consider detailed blood interactions and learn some neuropharmacology.
Mention the word alcohol and many pupils will sit up with added interest. At KS3 pupils can build a simple fermenter, using yeast, sugar and warm water. Bubble the CO2 through limewater, too. The product can be distilled in a demonstration and the percentage of alcohol and degree proof (measured originally by combustion of gunpowder!) discussed.
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