Biology B3 4.6 Biofuels.

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How can ethanol-based fuels be produced?
By anaerobic fermentation of sugars from plants.
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What can the ethanol distilled from the fermentation product be used as?
Fuel in motor vehicles.
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What are biofuels made from?
Natural products.
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What are to types of biofuel?
Ethanol-based fuels and biogas.
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What is the role of microorganisms join the production of ethanol?
Microorganisms respire anaerobically to produce the ethanol, using sugars from crops as the energy source.
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How is glucose produced during ethanol production?
Glucose is produced from maize starch by the action of a carbohydrase.
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How are the glucose and sugar cane juices used to produce ethanol.
They can be fermented by yeast to produce ethanol.
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How is the ethanol extracted?
By the process of distillation.
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What could ethanol be used for in the future?
Ethanol could be used as a fuel to replace fossil fuels in the future.
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What would be the benefits of using ethanol to replace fossil fuels in the future?
In terms of the 'greenhouse effect' using ethanol as a fuel is much more 'carbon friendly'.
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What term is used to describe ethanol because only the carbon dioxide used for photosynthesis by the crops is returned to the atmosphere when the ethanol is burned?
Carbon neutral.
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What are the processes involved in producing ethanol from starch?
Digestion of starch to sugar by carbohydrase, fermentation (anaerobic respiration) by yeast and distillation.
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How is ethanol extracted from the fermenter?
By distillation.
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Card 2

Front

What can the ethanol distilled from the fermentation product be used as?

Back

Fuel in motor vehicles.

Card 3

Front

What are biofuels made from?

Back

Preview of the front of card 3

Card 4

Front

What are to types of biofuel?

Back

Preview of the front of card 4

Card 5

Front

What is the role of microorganisms join the production of ethanol?

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