3(a) Ethanol is produced by the fermentation of glucose - Edexcel - GCSE Chemistry - Question 3 - 2015 - Paper 1
Question 3
3(a) Ethanol is produced by the fermentation of glucose. Yeast is needed for the fermentation reaction.
(i) State two other conditions for fermentation.
(ii) Compl... show full transcript
Worked Solution & Example Answer:3(a) Ethanol is produced by the fermentation of glucose - Edexcel - GCSE Chemistry - Question 3 - 2015 - Paper 1
Step 1
State two other conditions for fermentation.
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Answer
The temperature should be in the range of 25-40°C.
The fermentation process should occur in the absence of oxygen (anaerobic conditions).
Step 2
Complete the sentence by putting a cross (✗) in the box next to your answer.
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Answer
The correct answer is B: fractional distillation, as it is the method used to concentrate ethanol from a dilute solution.
Step 3
Write the balanced equation for the fermentation of glucose, C₆H₁₂O₆.
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The balanced equation for the fermentation is:
ightarrow 2C_2H_5OH + 2CO_2$$
Step 4
State two conditions for this reaction.
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The reaction typically requires a high temperature of about 300°C.
A catalyst, such as phosphoric acid, is often used to facilitate the reaction.
Step 5
Explain why the country would prefer to produce its ethanol from ethene rather than by fermentation.
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The country would prefer to produce ethanol from ethene due to several reasons:
Land requirements: Ethanol production via fermentation relies heavily on agricultural land for sugar crops. Given the limited fertile land, producing from ethene avoids putting pressure on land needed for food production.
Oil supply: As the country has large reserves of crude oil, utilizing crude oil derivatives like ethene ensures a reliable supply of raw materials for ethanol production.
Production speed: The industrial process from ethene is often more continuous and faster compared to the batch fermentation process, which can be slow.
Purity and efficiency: Ethanol production from ethene allows for a purer product, while fermentation can yield lower concentrations of ethanol, affecting overall efficiency.
