Bio 4.6 Biofuels 4.5 / 5 based on 2 ratings ? BiologyGCSEAQA Created by: DanCreated on: 01-04-13 10:02 What are biofuels made from? Natural products, such as organic waste 1 of 10 What is the name given to the method ethanol production? Fermentation 2 of 10 State briefly how ethanol is made. Microorganisms respire anaerobically to produce lactic acid. This lactic acid is ethanol 3 of 10 Now lets go into more detail, there are three steps to making ethanol. State the first. Starch turned to glucose by Carbohydrase enzyme. 4 of 10 Why is glucose needed? For the bacteria to feed on for energy to respire 5 of 10 State step 2. Juices fermented by yeast producing ethanol 6 of 10 State step 3. Ethanol is then extracted by distillation. Ethanol has no been produced and is ready to use. 7 of 10 What is the main sort of cop used to produce ethanol? Maize 8 of 10 When ethanol is used as a fuel it is Carbon neutral, state how. When maize is grown it uses Carbon Dioxide in photosynthesis. When ethanol is burned it gives off the CO2. 9 of 10 How is ethanol better than fossil fuels? It is renewable, Carbon neutral, cheap 10 of 10
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