11.6 Alcohols (Cambridge (CIE) O Level Chemistry): Flashcards
Exam code: 5070
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What is fermentation in the context of ethanol manufacture?
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What is fermentation in the context of ethanol manufacture?
Fermentation is the conversion of glucose into ethanol and carbon dioxide by enzymes in yeast, carried out at 25–35°C in the absence of oxygen.
Fermentation uses .......... as the raw material and requires .......... as the biological catalyst, at 25–35°C.
Fermentation uses glucose as the raw material and requires yeast as the biological catalyst, at 25–35°C.
Compare the temperature conditions for ethanol production by fermentation and by hydration of ethene.
Fermentation occurs at 25–35°C while hydration of ethene requires 300°C. Fermentation uses lower temperatures because the enzymes in yeast are destroyed at high temperatures.
The hydration method for ethanol production is a .......... process and produces a .......... product compared to fermentation.
The hydration method for ethanol production is a continuous process and produces a purer product compared to fermentation.
True or False?
Fermentation is carried out in the presence of oxygen to allow yeast to respire.
False.
Fermentation requires the absence of oxygen; in the presence of oxygen, yeast respires aerobically and does not produce ethanol.
In fermentation, glucose is converted to ethanol and .......... by the action of enzymes in yeast.
In fermentation, glucose is converted to ethanol and carbon dioxide by the action of enzymes in yeast.
Give one advantage of using fermentation rather than hydration to manufacture ethanol.
Fermentation uses glucose from plants, a renewable raw material, whereas hydration uses ethene from crude oil, a non-renewable resource.
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