Ethanol and Plastics

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What are the two ways that ethanol can be produced?
Fermentation and Hydration of ethene
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What is the process using fermentation?
The enzymes in yeast break down sugar (from plants) into ethanol and carbon dioxide
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What is the process of hydrating ethene?
Ethene is reacted with steam at a very high temperature and in the presence of a catalyst and this produces ethanol
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What are the advantages of fermentation?
It is cheaper as it is done at room temperature, it uses renewable sources
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What are the disadvantages of fermentation?
It can only produce an dilute aqueous solution of ethanol and this must be seperated by fractional distillation to give pure ethanol, it produces carbon dioxide which leads to the greenhouse effect
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What are the advantages of hydration of ethene?
It is a quick process that doesnt produce carbon dioxide, the reaction can be run continuously and produce pure ethanol
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What are the disadvantages of hydration of ethene?
The reaction requires a high temperature and ethene comes from crude oil which is a non-renewable source
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What does biodegradable mean?
Materials that can be broken down by micro-organisms
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How can plastics become biodegradable?
By adding cornstarch so that micro organisms can break the plastic down into small pieces and by being made from plant materials
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Other cards in this set

Card 2

Front

What is the process using fermentation?

Back

The enzymes in yeast break down sugar (from plants) into ethanol and carbon dioxide

Card 3

Front

What is the process of hydrating ethene?

Back

Preview of the front of card 3

Card 4

Front

What are the advantages of fermentation?

Back

Preview of the front of card 4

Card 5

Front

What are the disadvantages of fermentation?

Back

Preview of the front of card 5
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